fix(guide): simplify directory structure

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who/index.md

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+---
+title: Boo Who
+---
+![](//discourse-user-assets.s3.amazonaws.com/original/2X/3/3c8584a085a0deaea66b3400e6321eeadab552a2.jpg)
+
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### Problem Explanation:
+
+This program is very simple, the trick is to understand what a boolean primitive is. The programs requires a true or false answer.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean' target='_blank' rel='nofollow'>Boolean</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+*   You will need to check for the type of the parameter to see if it is a boolean.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+*   To check for the type of a parameter, you can use `typeof`.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+*   Since you must return true or false you can use if statements or just have it return the boolean used for the if statement.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+```javascript
+    function booWho(bool) {
+      return typeof bool === 'boolean';
+    }
+
+    // test here
+    booWho(null);
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLnK/0' target='_blank' rel='nofollow'>Run Code</a>
+
+# Code Explanation:
+
+Uses the operator `typeof` to check if the variable is a boolean. If it is, it will return `true`. Otherwise, if it is any other type it will return `false`.
+
+#### Relevant Links
+
+*   <a>Using typeof</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof' target='_blank' rel='nofollow'>typeof</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey/index.md

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+---
+title: Chunky Monkey
+---
+![](//discourse-user-assets.s3.amazonaws.com/original/2X/a/aadd6bead83ab7d79a795c326f005a89e6ad81f5.png)
+
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+Our goal for this Algorithm is to split `arr` (first argument) into smaller chunks of arrays with the length provided by `size` (second argument). There are 4 green checks (objectives) our code needs to pass in order to complete this Algorithm:
+
+1.  `(['a', 'b', 'c', 'd'], 2)` is expected to be `[['a', 'b'], ['c', 'd']]`
+2.  `([0, 1, 2, 3, 4, 5], 3)` is expected to be `[[0, 1, 2], [3, 4, 5]]`
+3.  `([0, 1, 2, 3, 4, 5], 2)` is expected to be `[[0, 1], [2, 3], [4, 5]]`
+4.  `([0, 1, 2, 3, 4, 5], 4)` is expected to be `[[0, 1, 2, 3], [4, 5]]`
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push' rel='nofollow'>Array.push()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice' target='_blank' rel='nofollow'>Array.slice()</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+The links above suggest to use `Array.push()`, so let's start by first creating a new array to store the smaller arrays we will soon have like this:
+```javascript
+    var newArray = [];
+```
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:")</a> Hint: 2
+
+Next we'll need a `for loop` to loop through `arr`.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+Finally, we need a method to do the actual splitting and we can use `Array.slice()` to do that. The key to this Algorithm is understanding how a `for loop`, `size`, `Array.slice()` and `Array.push()` all work together.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+```javascript
+    function chunkArrayInGroups(arr, size) {
+
+      var temp = [];
+      var result = [];
+
+      for (var a = 0; a < arr.length; a++) {
+        if (a % size !== size - 1)
+          temp.push(arr[a]);
+        else {
+          temp.push(arr[a]);
+          result.push(temp);
+          temp = [];
+        }
+      }
+
+      if (temp.length !== 0)
+        result.push(temp);
+      return result;
+    }
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/24' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   Firstly, we create two empty arrays called `temp` and `result`, which we will eventually return.
+*   Our **for loop** loops until `a` is equal to or more than the length of the array in our test.
+*   Inside our loop, we push to `temp` using `temp.push(arr[a]);` if the remainder of `a / size` is not equal to `size - 1`.
+*   Otherwise, we push to `temp`, push `temp` to the `result` variable and reset `temp` to an empty array.
+*   Next, if `temp` isn't an empty array, we push it to `result`.
+*   Finally, we return the value of `result`.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push' rel='nofollow'>Array.push()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for' target='_blank' rel='nofollow'>For Loops</a>
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+```javascript
+    function chunkArrayInGroups(arr, size) {
+      // Break it up.
+      var arr2 = [];
+      for (var i = 0; i < arr.length; i+=size) {
+    	arr2.push(arr.slice(i , i+size));
+      }
+      return arr2;
+    }
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/Cj9x/3' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   First, we create an empty array `arr2` where we will store our 'chunks'.
+*   The for loop starts at zero, increments by `size` each time through the loop, and stops when it reaches `arr.length`.
+*   Note that this for loop does not loop through `arr`. Instead, we are using the loop to generate numbers we can use as indices to slice the array in the right locations.
+*   Inside our loop, we create each chunk using `arr.slice(i, i+size)`, and add this value to `arr2` with `arr2.push()`.
+*   Finally, we return the value of `arr2`.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push' target='_blank' rel='nofollow'>Array.push()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice' target='_blank' rel='nofollow'>Array.slice()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for' target='_blank' rel='nofollow'>For Loops</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+```javascript
+    function chunkArrayInGroups(arr, size) {
+      // Break it up.
+      var newArr = [];
+      var i = 0;
+
+      while (i < arr.length) {
+        newArr.push(arr.slice(i, i+size));
+        i += size;
+      }
+      return newArr;
+    }
+    chunkArrayInGroups(["a", "b", "c", "d"], 2);
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/26' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   Firstly, we create two variables. `newArr` is an empty array which we will push to. We also have the `i` variable set to zero, for use in our while loop.
+*   Our while loop loops until `i` is equal to or more than the length of the array in our test.
+*   Inside our loop, we push to the `newArr` array using `arr.slice(i, i+size)`. For the first time it loops, it will look something like:
+
+    newArr.push(arr.slice(1, 1+2))
+
+*   After we push to `newArr`, we add the variable of `size` onto `i`.
+*   Finally, we return the value of `newArr`.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push' target='_blank' rel='nofollow'>Array.push()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice' target='_blank' rel='nofollow'>Array.slice()</a>
+*   <a href='https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/while' target='_blank' rel='nofollow'>While Loops</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution 2:
+```javascript
+    function chunkArrayInGroups(arr, size) {
+      var newArr = [];
+      while (arr.length) {
+        newArr.push(arr.splice(0,size));
+      }
+      return newArr;
+    }
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/579' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   Firstly, we create a variable. `newArr` is an empty array which we will push to.
+*   Our `while` loop loops until the length of the array in our test is not 0.
+*   Inside our loop, we push to the `newArr` array using `arr.splice(0, size)`.
+*   For each iteration of `while` loop, it deletes `size` number of elements from the front of `arr` and push them as an array to `newArr`.
+*   Finally, we return the value of `newArr`.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push' target='_blank' rel='nofollow'>Array.push()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice' target='_blank' rel='nofollow'>Array.splice()</a>
+*   <a href='https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/while' target='_blank' rel='nofollow'>While Loops</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution 3:
+```javascript
+    function chunkArrayInGroups(arr, size) {
+      if (arr.length <= size){
+        return [arr];
+      }
+      else {
+        return [arr.slice(0,size)].concat(chunkArrayInGroups(arr.slice(size),size));
+      }
+    }
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/579' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+* Array smaller than size is returned nested.
+* For any array larger than size, it's splited in two. First segment is nested and concatnated with second second segment which makes a recursive call.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Functions#Recursion' target='_blank' rel='nofollow'>Recursion</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice' target='_blank' rel='nofollow'>Array.splice()</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending/index.md

@@ -0,0 +1,35 @@
+---
+title: Confirm the Ending
+---
+## Confirm the Ending
+
+
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+# 🌻 Intermediate Code Solution:
+ (Declarative approach)
+
+```javascript
+function confirmEnding(str, target) {
+  // "Never give up and good luck will find you."
+  // -- Falcor
+  
+  return str.slice(str.length - target.length) === target;
+}
+
+confirmEnding("He has to give me a new name", "name");
+```
+
+#### 🚀 [Run Code](https://repl.it/repls/SardonicRoundAfkgaming)
+
+# Code Explanation:
+ - First we use the `slice` method copy the string.
+ - In order to get the last characters in `str` equivalent to the `target`'s length we use the `slice` method.
+ - The first parameter inside the `slice` method is the starting index and the second parameter would be the ending index.
+ - For example `str.slice(10, 17)` would return `give me`.
+ - In this case we only include one parameter which it will copy everything from the starting index.
+ - We substract the length of `str` and the length of `target`, that way, we shall get the last remaining characters equivalent to the `target`'s length.
+ - Finally we compare the return result of slice to `target` and check if they have the same characters.
+
+### Relevant Links
+ - [String.prototype.slice()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice)

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit/index.md

@@ -0,0 +1,64 @@
+---
+title: Convert Celsius to Fahrenheit
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+The algorithm to convert from Celsius to Fahrenheit is the temperature in Celsius times `9/5`, plus `32`.
+
+You are given a variable **celsius** representing a temperature in Celsius. Use the variable **fahrenheit** already defined and apply the algorithm to assign it the corresponding temperature in Fahrenheit.
+
+#### Relevant Links
+
+*   <a href='http://www.purplemath.com/modules/orderops.htm' target='_blank' rel='nofollow'>The Order of Operations: PEMDAS</a>
+*   <a href='https://www.khanacademy.org/math/pre-algebra/order-of-operations/order_of_operations/v/order-of-operations' target='_blank' rel='nofollow'>Order of Operation: Video</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+Take a look at the code. There is an area that you're not supposed to edit. From there, ask yourself - what is used there that I haven't seen before?
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+Keep in mind the **order of operation** check the link in the _links_ section for more information.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+```javascript
+    function convertToF(celsius) {
+      // Only change code below this line
+      var fahrenheit = (celsius * (9/5)) + 32;
+
+      // Only change code above this line
+      if ( typeof fahrenheit !== 'undefined' ) {
+      return fahrenheit;
+      } else {
+        return 'fahrenheit not defined';
+      }
+    }
+
+    // Change the inputs below to test your code
+    convertToF(30);
+```
+### Code Explanation:
+
+*   Declare the **fahrenheit** variable.
+*   Make sure the proper order of arithmetic operations is followed by using parenthesis (`()`) when needed.
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number/index.md

@@ -0,0 +1,113 @@
+---
+title: Factorialize a Number
+---
+![Recursion](//discourse-user-assets.s3.amazonaws.com/original/2X/d/dcf927a2e8c3beb7a9c28770153821982398bd99.jpg)
+
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+## ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+Return the factorial of the provided integer. If the integer is represented with the letter n, a factorial is the product of all positive integers less than or equal to n.
+
+Factorials are often represented with the shorthand notation n!
+
+For example: `5! = 1 * 2 * 3 * 4 * 5 = 120`
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+This one starts easily since `0! = 1`, so you can go ahead and simply `return 1` there.
+
+We can use that as an `if` in order to break the loop we're going to create using a **recursive function**. It will check if the number you gave the function is 0 (which would be the end of your factorial chain). Functions "end" when they return anything. In fact, **all** functions without an explicit `return` statement will return `undefined`.
+
+This is also why **instead** of having _"finished"_, a function is always said to _"have returned"_. And now this...
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+**Understanding recursion**
+
+Recursion refers to a function repeating (calling) itself. In this case we are basically returning the given number (i.e. 5), multiplied by the function itself but this time the value passed to the _num_ parameter is `num-1` (which initially translates to 4). The very function is going to **run inside itself** interesting, eh?
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+**Understanding the flow**
+
+The first **returned** value can be visualized better if you think about those parenthesis operations you did in secondary school where you do the math inside every parenthesis from inside out, bracket and square bracket until you get a final result (a total). This time it's the same thing, look at the program flow:
+
+### During the first execution of the function:
+
+[**num** = 5]
+
+Is 5 _equal_ to 1 or 0? **No** ---> Oki doki, let's continue...
+
+**Returns:**
+
+(**5** _(_second execution_: **4** _(_third execution_: **3** _(_fourth execution_: **2** __fifth execution_: **1**))))
+
+What it returns can be viewed as `(5*(4*(3*(2*1))))` or just `5 * 4 * 3 * 2 * 1`, and the function will return the result of that operation: `120`. Now, let's check what the rest of the executions do:
+
+### During the rest of the executions:
+
+**Second Execution**: _num_ = 5-1 = **4** -> is _num_ 0 or 1? No  
+
+--> return the multiplication between 4 and the next result when _num_ is now 4-1.
+
+**Third Execution**: _num_ = 4 - 1 = **3** -> is _num_ 0 or 1? No  
+
+--> return the multiplication between 3 and the next result when _num_ is now 3-1.
+
+**Fourth Execution**: _num_ = 3-1 = **2** -> is _num_ 0 or 1? No  
+
+--> return the multiplication between 2 and the next result when _num_ is now 2-1.
+
+**Fifth Execution**: _num_ = 2-1 = **1** -> is _num_ 0 or 1? Yep  
+
+--> return **1**. And this is where the recursion stops because there are no more executions.
+
+Got it? ![:wink:](https://forum.freecodecamp.com/images/emoji/emoji_one/wink.png?v=3 ":wink:")
+
+> _try to solve the problem now_
+
+#### Relevant Links
+
+*   <a href='https://www.youtube.com/watch?v=R8SjM4DKK80' target='_blank' rel='nofollow'>JS Functions</a>
+*   <a href='https://www.youtube.com/watch?v=k7-N8R0-KY4' target='_blank' rel='nofollow'>Recursion in JS</a>
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Code Solution:
+
+    function factorialize(num) {
+      if (num === 0) { return 1; }
+      return num * factorialize(num-1);
+    }
+
+    factorialize(5);
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/1' target='_blank' rel='nofollow'>Run Code</a>
+
+## Code Explanation:
+
+Notice at the first line we have the terminal condition, i.e a condition to check the end of the recursion. If `num == 0`, then we return 1, i.e. effectively ending the recursion and informing the stack to propagate this value to the upper levels. If we do not have this condition, the recursion would go on until the stack space gets consumed, thereby resulting in a <a href='https://en.wikipedia.org/wiki/Stack_overflow' target='_blank' rel='nofollow'>Stack Overflow</a>.
+
+### Relevant Links
+
+*   <a href='https://www.codecademy.com/en/courses/javascript-lesson-205/0/1' target='_blank' rel='nofollow'>Recursion</a>
+*   <a href='https://en.wikipedia.org/wiki/Factorial' target='_blank' rel='nofollow'>Factorialization</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators' target='_blank' rel='nofollow'>Arithmetic Operators</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer/index.md

@@ -0,0 +1,71 @@
+---
+title: Falsy Bouncer
+---
+![](//discourse-user-assets.s3.amazonaws.com/original/2X/5/55dedad40d9f3f662c70d1eac4effc00c7d26bd9.jpg)
+
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+Remove all <a href='https://guide.freecodecamp.org/javascript/falsy-values/' target='_blank' rel='nofollow'>falsy</a> values from an array.
+
+#### Relevant Links
+
+*   <a href='https://guide.freecodecamp.org/javascript/falsy-values/' target='_blank' rel='nofollow'>Falsy Values</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+Falsy is something which evaluates to FALSE. There are only six falsy values in JavaScript: undefined, null, NaN, 0, "" (empty string), and false of course.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+We need to make sure we have all the falsy values to compare, we can know it, maybe with a function with all the falsy values...
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+Then we need to add a `filter()` with the falsy values function...
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+
+    function bouncer(arr) {
+      return arr.filter(Boolean);
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/32' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+The `Array.prototype.filter` method expects a function that returns a `Boolean` value which takes a single argument and returns `true` for <a href='http://forum.freecodecamp.com/t/javascript-truthy-value/15975' target='_blank' rel='nofollow'>truthy</a> value or `false` for <a href='https://guide.freecodecamp.org/javascript/falsy-values/' target='_blank' rel='nofollow'>falsy</a> value. Hence we pass the built-in `Boolean` function.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-boolean/14311' target='_blank' rel='nofollow'>Boolean</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-truthy-value/15975' target='_blank' rel='nofollow'>Truthy</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-filter/14289' target='_blank' rel='nofollow'>Array.prototype.filter()</a>
+
+## ![:trophy:](https://forum.freecodecamp.com/images/emoji/emoji_one/trophy.png?v=3 ":trophy:") Credits:
+
+If you found this page useful, you can give thanks by copying and pasting this on the main chat:
+
+**`Thanks @renelis @abhisekp @Rafase282 for your help with Algorithm: Falsy Bouncer`**
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string/index.md

@@ -0,0 +1,139 @@
+---
+title: Find the Longest Word in a String
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+You have to go through each word and figure out which one is the longest and return not the word, but how many characters it has.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length' target='_blank' rel='nofollow'>JS String Length</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+You should split the string into an array of words.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+You will need to figure out a way to keep track globally of the greatest current length.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+Remember how to get the length of elements on the array? `Array[index].length`.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+    function findLongestWordLength(str) {
+      var words = str.split(' ');
+      var maxLength = 0;
+
+      for (var i = 0; i < words.length; i++) {
+        if (words[i].length > maxLength) {
+          maxLength = words[i].length;
+        }
+      }
+
+      return maxLength;
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/5' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+Take the string and convert it into an array of words. Declare a variable to keep track of the maximum length and loop from 0 to the length of the array of words.
+
+Then check for the longest word by comparing the current word to the previous one and storing the new longest word. At the end of the loop just return the number value of the variable maxLength.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/length' target='_blank' rel='nofollow'>JS Array.length</a>
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+
+**Using `.reduce()`**
+
+    function findLongestWordLength(s) {
+      return s.split(' ')
+        .reduce(function(x, y) {
+          return Math.max(x, y.length)
+        }, 0);
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/6' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+For more information on `reduce` <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce' target='_blank' rel='nofollow'>click here.</a>  
+
+In case you're wondering about that `0` after the callback function, it is used to give an initial value to the `x`, so that `Math.max` will know where to start.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-reduce/14299' target='_blank' rel='nofollow'>JS Reduce</a>
+*   <a href='http://forum.freecodecamp.com/t/using-array-prototype-reduce-to-reduce-conceptual-boilerplate-for-problems-on-arrays/14687' target='_blank' rel='nofollow'>JS Reduce Made Easy</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-math-max/14682.md' target='_blank' rel='nofollow'>JS Math Max</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+
+**Using recursiveness**
+
+    function findLongestWordLength(str) {
+
+      //split the string into individual words 
+      //(important!!, you'll see why later)
+      str = str.split(" ");
+
+      //str only has 1 element left that is the longest element, 
+      //return the length of that element
+      if(str.length == 1){
+        return str[0].length;
+      }
+
+      //if the first element's length is greater than the second element's (or equal) 
+      //remove the second element and recursively call the function)
+      if(str[0].length >= str[1].length){
+        str.splice(1,1);
+        return findLongestWordLength(str.join(" "));
+      }
+
+      //if the second element's length is greater thant the first element's start 
+      //call the function past the first element 
+      if(str[0].length <= str[1].length){
+        // from the first element to the last element inclusive.
+        return findLongestWordLength(str.slice(1,str.length).join(" "));
+      }
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/7' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+The first line splits the string into individual words. Then we check if `str` only has 1 element left then that is the longest element and we return it. If the first element's length is greater than the second element's (or equal), we remove the second element and recursively call the function `findLongestWord`. However, if the second element's length is greater thant the first element's start, then we call the function past the first element.
+
+#### Relevant Links
+
+*   <a href='https://www.youtube.com/watch?v=R8SjM4DKK80' target='_blank' rel='nofollow'>JS Functions</a>
+*   <a href='https://www.youtube.com/watch?v=k7-N8R0-KY4' target='_blank' rel='nofollow'>Recursion Basics</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers/index.md

@@ -0,0 +1,41 @@
+---
+title: Finders Keepers
+---
+## Problem Explanation
+We need to return the element from an array that passes a function. Both the `function` and the `array` are passed into our function `findElement(arr, func)`.
+
+## Hint: 1
+Looking through the array can be done with a `for` loop.
+>*try to solve the problem now*
+
+## Hint: 2
+`num` is passed to the function. We will need to set it to the elements we want to check with the function.
+>*try to solve the problem now*
+
+## Hint: 3
+Do not forget, if none of the numbers in the array pass the test, it should return `undefined`.
+>*try to solve the problem now*
+
+## Basic Solution
+
+```javascript
+function findElement(arr, func) {
+  let num = 0;
+  
+  for(var i = 0; i < arr.length; i++) {
+    num = arr[i];
+    if (func(num)) {
+      return num;
+    }
+  }
+  
+  return undefined;
+}
+```
+
+## Code Explanation
+
+* Challenge asks us to look through array. This is done using a `for` loop.
+* The `num` variable is being passed into the function, so we set it to each index in our array.
+* The pre-defined function already checks each number for us, so if it is "true", we return that num.
+* If none of the numbers in the array pass the function's test, we return undefined.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/index.md

@@ -0,0 +1,13 @@
+---
+title: Basic Algorithm Scripting
+---
+## Basic Algorithm Scripting
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/quadratic-equations/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations/index.md

@@ -0,0 +1,99 @@
+---
+title: Mutations
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+*   Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array..
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-indexof/15936' target='_blank' rel='nofollow'>String.indexOf()</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+*   If everything is lowercase it will be easier to compare.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+*   Our strings might be easier to work with if they were arrays of characters.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+*   A loop might help. Use `indexOf()` to check if the letter of the second word is on the first.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+**Procedural**
+
+    function mutation(arr) {
+      var test = arr[1].toLowerCase();
+      var target = arr[0].toLowerCase();
+      for (var i=0;i<test.length;i++) {
+        if (target.indexOf(test[i]) < 0)
+          return false;
+      }
+      return true;
+     }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/30' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+First we make the two strings in the array lowercase. `test` will hold what we are looking for in `target`.  
+Then we loop through our test characters and if any of them is not found we `return false`.
+
+If they are _all_ found, the loop will finish without returning anything and we get to `return true`.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-tolowercase/15948' target='_blank' rel='nofollow'>String.toLowerCase()</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-for-loop/14666s-Explained' target='_blank' rel='nofollow'>For loops</a>
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+
+**Declarative**
+
+    function mutation(arr) {
+      return arr[1].toLowerCase()
+        .split('')
+        .every(function(letter) {
+          return arr[0].toLowerCase()
+            .indexOf(letter) != -1;
+        });
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/31' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+Grab the second string, lowercase and turn it into an array; then make sure _every_ one of its _letters_ is a part of the lowercased first string.
+
+`Every` will basically give you letter by letter to compare, which we do by using `indexOf` on the first string. `indexOf` will give you -1 if the current `letter` is missing. We check that not to be the case, for if this happens even once `every` will be false.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-split/15944' target='_blank' rel='nofollow'>Array.split()</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-every/14287' target='_blank' rel='nofollow'>Array.every()</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string/index.md

@@ -0,0 +1,115 @@
+---
+title: Repeat a String Repeat a String
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+The program is very simple, we have to take a variable and return that variable being repeated certain amount of times. No need to add space or anything, just keep repeating it into one single string.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String' target='_blank' rel='nofollow'>Global String Object</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+You can't edit strings, you will need to create a variable to store the new string.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+Create a loop to repeat the code as many times as needed.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+Make the variable created store the current value and append the word to it.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+    function repeatStringNumTimes(str, num) {
+      var accumulatedStr = '';
+
+      while (num > 0) {
+        accumulatedStr += str;
+        num--;
+      }
+
+      return accumulatedStr;
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/19' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   Create an empty string variable to store the repeated word.
+*   Use a while loop or for loop to repeat code as many times as needed according to `num`
+*   Then we just have to add the string to the variable created on step one, and increase or decrease `num` depending on how you set the loop.
+*   At the end of the loop, return the variable for the repeated word.
+
+#### Relevant Links
+
+*   <a>JS while Loop</a>
+*   <a href='https://forum.freecodecamp.com/t/javascript-for-loop/14666s-Explained' target='_blank' rel='nofollow'>JS For Loops Explained</a>
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+
+    function repeatStringNumTimes(str, num) {
+      if(num < 0)
+        return "";
+      if(num === 1)
+        return str;
+      else
+        return str + repeatStringNumTimes(str, num - 1);
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/21' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   This solution uses recursion.
+*   We check if `num` is negative and return an empty string if true.
+*   Then we check if it's equal to 1 and in that case we return the string itself.
+*   If not, we add the string to a call of our function with `num` being decreased by 1, which will add another `str` and another.. until eventually `num` is 1\. And return that whole process.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Functions#Recursion' target='_blank' rel='nofollow'>Functions - Recursion</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+
+    function repeatStringNumTimes(str, num) {
+      return num > 0 ? str.repeat(num) : '';
+    }
+
+    repeatStringNumTimes("abc", 3);
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/85' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   This solution takes a declarative approach.
+*   It is similar to the third solution, except it uses the ternary operator form of the `if` statement.
+
+#### Relevant Links
+
+*   <a href='https://forum.freecodecamp.com/t/javascript-ternary-operator/15973' target='_blank' rel='nofollow'>JS Ternary</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='https://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays/index.md

@@ -0,0 +1,151 @@
+---
+title: Return Largest Numbers in Arrays
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+You will get an array that contains sub arrays of numbers and you need to return an array with the largest number from each of the sub arrays.
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+You will need to keep track of the array with the answer and the largest number of each sub-array.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+You can work with multidimensional arrays by `Array[Index][SubIndex]`
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+
+Pay close attention to the timing of the storing of variables when working with loops
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solutions ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+**(Procedural approach)**
+
+    function largestOfFour(arr) {
+      var results = [];
+      for (var n = 0; n < arr.length; n++) {
+        var largestNumber = arr[n][0];
+        for (var sb = 1; sb < arr[n].length; sb++) {
+          if (arr[n][sb] > largestNumber) {
+            largestNumber = arr[n][sb];
+          }
+        }
+
+        results[n] = largestNumber;
+      }
+
+      return results;
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/734' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   Create a variable to store the _results_ as an array.
+*   Create an outer loop to iterate through the outer array.
+*   Create a second variable to hold the largest number and initialise it with the first number. This must be outside an inner loop so it won't be reassigned until we find a larger number.
+*   Create said inner loop to work with the sub-arrays.
+*   Check if the element of the sub array is larger than the currently stored largest number. If so, then update the number in the variable.
+*   After the inner loop, save the largest number in the corresponding position inside of the `results` array.
+*   And finally return said array.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-for-loop/14666s-Explained' target='_blank' rel='nofollow'>For loops</a>
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+
+**(Declarative approach)**
+
+    function largestOfFour(arr) {
+      return arr.map(function(group){
+        return group.reduce(function(prev, current) {
+          return (current > prev) ? current : prev;
+        });
+      });
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/733' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   we map all items within the main array to a new array using `Array.prototype.map()` and return this array as the final result
+*   within each inner array, we reduce its contents down to a single value using `Array.prototype.reduce()`
+*   the callback function passed to the reduce method takes the previous value and the current value and compares the two values
+*   if the current value is higher than the previous value we set it as the new previous value for comparison with the next item within the array or returns it to the map method callback if it's the last item
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-map/14294' target='_blank' rel='nofollow'>Array.prototype.map()</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-reduce/14299' target='_blank' rel='nofollow'>Array.prototype.reduce()</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-ternary-operator/15973' target='_blank' rel='nofollow'>Ternary Operators</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+
+**(Declarative approach)**
+
+    function largestOfFour(arr) {
+      return arr.map(Function.apply.bind(Math.max, null));
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/17' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+TL;DR: We build a special callback function (using the `Function.bind` method), that works just like `Math.max` but also has `Function.prototype.apply`'s ability to take arrays as its arguments ![:smiley:](https://forum.freecodecamp.com/images/emoji/emoji_one/smiley.png?v=3 ":smiley:")
+
+*   We start by mapping through the elements inside the main array. Meaning each one of the inner arrays.
+*   Now the need a callback function to find the max of each inner array provided by the map.
+
+So we want to create a function that does the work of `Math.max` and accepts input as an array (which by it doesn't by default).
+
+In other words, it would be really nice and simple if this worked by itself:
+
+`Math.max([9, 43, 20, 6]); // Resulting in 43`
+
+Alas, it doesn't.
+
+*   To do the work of accepting arguments in the shape of an array, there is this `Function.prototype.apply` method, but it complicates things a bit by _invoking_ the _context_ function.  
+
+i.e. `Math.max.apply(null, [9, 43, 20, 6]);` would invoke something like a `Max.max` method. What we're looking for... almost.
+
+Here we're passing `null` as the _context_ of the `Function.prototype.apply` method as `Math.max` doesn't need any context.
+
+*   Since `arr.map` expects a callback function, not just an expression, we create a function out of the previous expression by using the `Function.bind` method.
+*   Since, `Function.prototype.apply` is a static _method_ of the same `Function` _object_, we can call `Function.prototype.bind` on `Function.prototype.apply` i.e. `Function.prototype.apply.bind`.
+*   Now we pass the _context_ for the `Function.prototype.apply.bind` call (in this case we want `Math.max`so we can gain its functionality).
+*   Since the embedded `Function.prototype.apply` method will also require a context as it's 1st argument, we need to pass it a bogus _context_.
+    *   So, we pass `null` as the 2nd param to `Function.prototype.apply.bind` which gives a _context_ to the `Math.max` method.
+
+    *   Since, `Math.max` is independent of any _context_, hence, it ignores the bogus _context_ given by `Function.prototype.apply` method call.
+    *   Thus, our `Function.prototype.apply.bind(Math.max, null)` makes a new function accepting the `arr.map` values i.e. the inner arrays.
+
+#### Relevant Links
+
+*   <a href ='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/max' target='_blank' rel='nofollow'> Math.max</a>
+*   <a href='http://devdocs.io/#q=js+Function+apply' target='_blank' rel='nofollow'>Function.prototype.apply on DevDocs</a>
+*   <a href='http://devdocs.io/#q=js+Function+bind' target='_blank' rel='nofollow'>Function.bind on DevDocs</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string/index.md

@@ -0,0 +1,65 @@
+---
+title: Reverse a String
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+We need to take the string and reverse it, so if it originally reads 'hello', it will now read 'olleh'. We will need to split the string, and therefore we will be working with Arrays as well.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split' target='_blank' rel='nofollow'>str.split()</a>
+*   <a href='https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse' target='_blank' rel='nofollow'>arr.reverse()</a>
+*   <a href='https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/join' target='_blank' rel='nofollow'>arr.join()</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+Start by splitting the string by characters.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+Look up the built in function to reverse a string.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+Do not forget to join the characters back together after you reverse them.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+    function reverseString(str) {
+      return str.split('').reverse().join('');
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   Our goal is to take the input, `str`, and return it in reverse. Our first step is to split the string by characters using `split('')`. Notice that we don't leave anything in between the single quotes, this tells the function to split the string by each character.
+
+*   Using the `split()` function will turn our string into an array of characters, keep that in mind as we move forward.
+
+*   Next we _chain_ the `reverse()` function, which takes our array of characters and reverses them.
+
+*   Finally, we _chain_ `join('')` to put our characters back together into a string. Notice once again that we left no spaces in the argument for join, this makes sure that the array of characters is joined back together by each character.
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice/index.md

@@ -0,0 +1,92 @@
+---
+title: Slice and Splice
+---
+## Slice and Splice
+
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+We need to copy each element from the first array into the second array starting at the index n. We've also got to ensure that the original arrays are not mutated. That is, we cannot make any changes to the original arrays.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice' target='_blank' rel='nofollow'>str.slice()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice' target='_blank' rel='nofollow'>str.splice()</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+Create a copy of the second array inside of the function. This will ensure that the original array is not mutated. This can be done by using the slice operation on the second array, and assign it to a variable.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+Loop through all of the items in the first array. For each item in the first array splice it into the copied array in the index given as argument.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+Increment the index after performing the splice. 
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](https://discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+```js
+function frankenSplice(arr1, arr2, n) {
+  // It's alive. It's alive!
+  let localArray = arr2.slice();
+  for (let i = 0; i < arr1.length; i++) {
+    localArray.splice(n, 0, arr1[i]);
+    n++;
+  }
+  return localArray;
+}
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/repls/RedundantGrossGenres' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+* Our goal is to take all of the elements from `arr1` and insert them into `arr2` starting with index position `n`. At the same time we must ensurethat neither `arr` or `arr2` have been mutated. 
+
+* Using the `slice()` function we can create an exact replica of `arr2` and assign the result of the operation to a variable, `localArray`. 
+
+* Now that we have an array that we can mutate on, we can iterate through every item in the first array. For each item in the first array we can use the `splice()` function to insert the item into index `n` of `localArray`.
+
+* We increment the index `n` by one. This will ensure that every item from the `arr1` is inserted into `localArray` in the proper index position. 
+
+* Finally, we return the `localArray` and end the function. 
+
+
+## 🌻 Intermediate Code Solution:
+```js
+function frankenSplice(arr1, arr2, n) {
+  // It's alive. It's alive!
+  let localArr = arr2.slice();
+  localArr.splice(n, 0, ...arr1);
+  return localArr;
+}
+```
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/repls/BelovedNegativeMoto' target='_blank' rel='nofollow'>Run Code</a>
+
+* Since our goal is to return the new array with out altering `arr1` or `arr2` we create a `localArr` and add all the items from `arr2` using the `slice()` function
+
+* Since the `splice()` function will mutate (alter) arrays and can be used to add new elements we will use it to add the contents of `arr1` into `localArr`.  `n` is the starting position where our content will be inserted.  We won't be deleting any elements so the next argument is `0`.  Then we add the entire contents of `arr1` using spread syntax `...`.
+
+* `localArr` is returned and the function is complete.
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence/index.md

@@ -0,0 +1,132 @@
+---
+title: Title Case a Sentence
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+We have to return a sentence with title case. This means that the first letter will always be in uppercase and the rest will be in lowercase.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String' target='_blank' rel='nofollow'>Global String Object</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-tolowercase/15948' target='_blank' rel='nofollow'>JS String Prototype ToLowerCase</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-touppercase/15950' target='_blank' rel='nofollow'>JS String Prototype ToUpperCase</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-replace/15942' target='_blank' rel='nofollow'>JS String Prototype Replace</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+*   You should start by splitting the string into an array of words.
+*   Split the sentence.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+*   You should make the word lowercase before making the first letter uppercase.
+*   Use replace method on each word to capitalize the first letter of each word.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+*   You will need to create a new string with pieces of the previous one and at the end merge everything into a single string again.
+*   In replace method, give first argument as the position of the first letter using charAt. For second argument write a function to return the capitalized letter as the replacement.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+    String.prototype.replaceAt = function(index, character) {
+        return this.substr(0, index) + character + this.substr(index+character.length);
+    };
+
+    function titleCase(str) {
+        var newTitle = str.split(' ');
+        var updatedTitle = [];
+        for (var st in newTitle) {
+            updatedTitle[st] = newTitle[st].toLowerCase().replaceAt(0, newTitle[st].charAt(0).toUpperCase());
+        }
+        return updatedTitle.join(' ');
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/8' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+We are modifying the `replaceAt` function using prototype to facilitate the use of the program.
+
+Split the string by white spaces, and create a variable to track the updated title. Then we use a loop to turn turn the first character of the word to uppercase and the rest to lowercase. by creating concatenated string composed of the whole word in lowercase with the first character replaced by it's uppercase.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-for-loop/14666s-Explained' target='_blank' rel='nofollow'>JS For Loops Explained</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-split/15944' target='_blank' rel='nofollow'>JS String Prototype Split</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-string-prototype-substr/15945' target='_blank' rel='nofollow'>JS String Prototype Substr</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-join/14292' target='_blank' rel='nofollow'>JS Array Prototype Join</a>
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+
+    function titleCase(str) {
+      var convertToArray = str.toLowerCase().split(" ");
+      var result = convertToArray.map(function(val){
+          return val.replace(val.charAt(0), val.charAt(0).toUpperCase());
+      });
+      return result.join(" ");
+    }
+
+    titleCase("I'm a little tea pot");
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/9' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+We are making entire string lowercase and then converting it into array. Then we are using map function to replace the lowercase character with uppercase. Finally, we are returning the string using `join` method.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-map/14294' target='_blank' rel='nofollow'>JS Array Prototype Map</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+
+    function titleCase(str) {
+      return str.toLowerCase().replace(/(^|\s)\S/g, (L) => L.toUpperCase());
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/14' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+The solution works by first lowercasing all the characters in the string and then only uppercasing the first character of each word.  
+- Lowercase the whole string using `str.toLowerCase()`.  
+- Replace every word' first character to uppercase using `.replace`.  
+- Search for character at the beginning of each word i.e. matching any character following a `space` or matching the first character of the whole string, by using the following pattern.  
+- Regex explanation:
+
+*   Find all non-whitespace characters `(\S`)
+*   At the beginning of string `(^)`
+*   Or after any whitespace character `(\s)`
+    *   The `g` modifier searches for other such word pattern in the whole string and replaces them.
+
+    *   This solution works with national symbols and accented letters as illustrated by following examples  
+        `international characters:` 'бабушка курит трубку' // -> 'Бабушка Курит Трубку'  
+        `accented characters:` 'località àtilacol' // -> 'Località Àtilacol'
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions' target='_blank' rel='nofollow'>JS Regex Resources</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string/index.md

@@ -0,0 +1,100 @@
+---
+title: Truncate a String
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+We need to reduce the length of the string or **truncate** it if it is longer than the given maximum lengths specified and add `...` to the end. If it is not that long then we keep it as is.
+
+#### Relevant Links
+
+*   <a href='https://github.com/FreeCodeCamp/FreeCodeCamp/wiki/JS-String-Prototype-Slice' target='_blank' rel='nofollow'>String.prototype.slice()</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+Strings are immutable in JavaScript so we will need a new variable to store the truncated string.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+You will need to use the slice() method and specify where to start and where to stop.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+Do not forget that when we truncate the word, we also must count the length added by `...`
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+    function truncateString(str, num) {
+      // Clear out that junk in your trunk
+      if (str.length > num && num > 3) {
+        return str.slice(0, (num - 3)) + '...';
+      } else if (str.length > num && num <= 3) {
+        return str.slice(0, num) + '...';
+      } else {
+        return str;
+      }
+
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/55' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   First we start off with a simple `if` statement to determine one of three outcomes...
+*   If our string length is greater than the `num` we want to truncate at, and our truncate point is at least three characters or more into the string, we return a slice of our string starting at character 0, and ending at `num - 3`. We then append our `'...'` to the end of the string.
+*   However, if our string length is greater than the `num` but `num` is within the first three characters, we don't have to count our dots as characters. Therefore, we return the same string as above, with one difference: The endpoint of our slice is now just `num`.
+*   Finally, if none of the above situations are true, it means our string length is less than our truncation `num`. Therefore, we can just return the string.
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+
+    function truncateString(str, num) {
+      if (str.length <= num) {
+        return str;
+      } else {
+        return str.slice(0, num > 3 ? num - 3 : num) + '...';
+      }
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/54' target='_blank' rel='nofollow'>Run Code</a>
+
+### Code Explanation:
+
+*   First we need an if-statement to test if the length of the full string passed in as the first argument already fits within the size limit passed in as the second argument. If so we can just return the string that was passed in.
+
+    if (str.length <= num)
+      return str;
+
+*   If our `if` statement above fails, we move to the `else`, where we are going to return a "slice" of the string. The slice method extracts a section of a string and returns a new string. Here we pass 0 as the starting point for our slice. To determine the endpoint, we use a ternary operator: `num > 3 ? num - 3 : num`. In our ternary, if `num` is larger than 3, we must factor in the three dots to our total length, and thus we end our slice at `num-3`. If num is less than or equal to 3, our slice gets an end variable of just `num`. Finally, the `'...'` is appended to the end of our new string and is returned.
+
+    } else {
+        return str.slice(0, num > 3 ? num - 3 : num) + '...';
+      }
+
+*   **NOTE** In order to understand the above code, you need to understand how a Ternary Operator works. The Ternary Operator is frequently used as a shortcut for the `if` statement and follows this format: `condition ? expr1 : expr2`. If the `condition` evaluates to true, the operator returns the value of `expr1`. Otherwise, it returns the value of `expr2`.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator' target='_blank' rel='nofollow'>Conditional (ternary) Operator</a>
+*   <a href='https://github.com/FreeCodeCamp/FreeCodeCamp/wiki/JS-String-Prototype-Slice' target='_blank' rel='nofollow'>String.prototype.slice()</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.

guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong/index.md

@@ -0,0 +1,198 @@
+---
+title: Where Do I Belong
+---
+![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
+
+### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
+
+This can be a tricky problem to understand. You need to find where in the array a number should be inserted by order, and return the index where it should go.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-sort/14306' target='_blank' rel='nofollow'>JS Array Sort</a>
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
+
+The first thing to do is sort the array from lower to bigger, just to make the code easier. This is where sort comes in, it needs a callback function so you have to create it.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 2
+
+Once the array is sorted, then just check for the first number that is bigger and return the index.
+
+> _try to solve the problem now_
+
+## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 3
+
+If there is no index for that number then you will have to deal with that case too.
+
+> _try to solve the problem now_
+
+## Spoiler Alert!
+
+![warning sign](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
+
+**Solution ahead!**
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+    function getIndexToIns(arr, num) {
+      arr.sort(function(a, b) {
+        return a - b;
+      });
+
+      for (var a = 0; a < arr.length; a++) {
+        if (arr[a] >= num)
+          return a;
+      }
+
+      return arr.length;
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/36' target='_blank' rel='nofollow'>Run Code</a>
+
+## Code Explanation:
+
+*   First I sort the array using `.sort(callbackFuntion)` to sort it by lowest to highest, from left to right.
+*   Then I use a for loop to compare the items in the array starting from the smallest one. When an item on the array is greater than the number we are comparing against, then we return the index as an integer.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-parseint/14686' target='_blank' rel='nofollow'>parseInt()</a>
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+    function getIndexToIns(arr, num) {
+      // Find my place in this sorted array.
+      var times = arr.length; // runs the for loop once for each thing in the array
+      var count = 0; 
+      for (var i=0;i<times;i++){
+        if(num>arr[i]){count++;} } // counts how many array numbers are smaller than num
+        return count; // the above equals num's position in a sorted array
+    }
+
+    getIndexToIns([40, 60], 50);
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/2547' target='_blank' rel='nofollow'>Run Code</a>
+
+## Code Explanation:
+
+*   I do not sort the arr input array
+*   I run a for loop counting whenever the num input is bigger than an arr input number.
+*   This number is equivalent to what num's position would be in a sorted array.
+
+## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
+
+by [@HarinaPana](/u/harinapana)
+
+    function getIndexToIns(arr, num) {
+
+      arr.sort(function(a, b) {
+      return a - b;
+      });
+
+      var i = 0;
+      while (num > arr[i]) {
+      i++;
+      }
+
+      return i;
+    }
+
+    getIndexToIns([40, 60], 50);
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/4135' target='_blank' rel='nofollow'>Run Code</a>
+
+## Code Explanation:
+
+*   Sort existing array.
+*   Iterate through the array while checking if _num_ is bigger.
+*   The loop will stop when _num_ isn't bigger than _i_ and return the last element checked.
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+
+by [@faustodc](/u/faustodc)
+
+    function getIndexToIns(arr, num) {
+      arr.push(num);
+      arr.sort(function(a, b){return a-b});
+      return arr.indexOf(num);
+    }
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/EB10/1' target='_blank' rel='nofollow'>Run Code</a>
+
+## Code Explanation:
+
+*   First we add the number `num` to the array using `push()` which adds it as the last element of the array.
+*   Then we use `sort()` with the callback function `function(a, b){return a-b}` to sort the numbers in ascending order.
+*   Lastly we return the postion or index of `num` in the array with the `indexOf()` function.
+
+#### Relevant Links
+
+*   <a href='http://forum.freecodecamp.com/t/javascript-array-prototype-push/14298' target='_blank' rel='nofollow'>push()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort' target='_blank' rel='nofollow'>sort()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf' target='_blank' rel='nofollow'>indexOf()</a>
+
+## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
+
+**Using `.findIndex()`**
+
+    function getIndexToIns(arr, num) {
+      // sort and find right index
+      var index = arr.sort((curr, next) => curr > next)
+        .findIndex((currNum)=> num <= currNum);
+      // Returns proper answer
+      return index === -1 ? arr.length : index;
+    }
+
+    getIndexToIns([40, 60], 500);
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/CLjU/63' target='_blank' rel='nofollow'>Run Code</a>
+
+## Code Explanation:
+
+*   First sort the array in ascending order, this is currently done using array functions for minimal footprint.
+*   Once the array it is sorted, we directly apply the `.findIndex()` where we are going to compare every element in the array until we find where `num <= currNum` meaning where the number we want to insert is less or equal to the current number number in the iteration.
+*   Then we use ternary operations to check whether we got an index returned or `-1`. We only get `-1` when the index was not found meaning when we get a false for all elements int he array, and for such case, it would mean that `num` should be inserted at the end of the list hence why we use `arr.length`.
+
+#### Relevant Links
+
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex' target='_blank' rel='nofollow'>Array.findIndex()</a>
+*   <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions' target='_blank' rel='nofollow'>Arrow Functions</a>
+*   <a href='http://forum.freecodecamp.com/t/javascript-ternary-operator/15973' target='_blank' rel='nofollow'>Ternary Operator</a>
+
+## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
+
+by [@nivrith](/u/nivrith)
+
+    function getIndexToIns(arr, num) {
+
+    return arr.concat(num).sort((a,b) => a-b).indexOf(num);
+
+    }
+
+    getIndexToIns([1,3,4],2);
+
+![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://repl.it/IUJE/0' target='_blank' rel='nofollow'>Run Code</a>
+
+## Code Explanation:
+
+*   We use method-chaining to invoke one method after another to solve the problem in a single line. First we merge `arr` and `num` by invoking the arr.concat(num) method
+*   Then we use `sort()` with the callback **arrow function** `(a, b) => return a-b` to sort the numbers in ascending order
+*   Lastly we return the postion or index of `num` in the array with the `indexOf()` method
+
+#### Relevant Links
+
+*   <a href='https://schier.co/blog/2013/11/14/method-chaining-in-javascript.html' target='_blank' rel='nofollow'>Method chaining in JavaScript</a>
+*   <a href='https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/concat?v=example' target='_blank' rel='nofollow'>concat()</a>
+*   <a href='https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Functions/Arrow_functions' target='_blank' rel='nofollow'>Arrow functions</a>
+
+## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
+
+*   ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
+*   Add an explanation of your solution.
+*   Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
+*   Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
+
+> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.