fix: added 12 missing solutions to Basic Data Structure Challenges (#35744)

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-to-an-array-with-push-and-unshift.english.md

@@ -60,6 +60,12 @@ console.log(mixedNumbers(['IV', 5, 'six']));
 <section id='solution'>
 
 ```js
-// solution required
+function mixedNumbers(arr) {
+  // change code below this line
+  arr.push(7,'VIII',9);
+  arr.unshift('I',2,'three');
+  // change code above this line
+  return arr;
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-using-splice.english.md

@@ -61,6 +61,9 @@ console.log(htmlColorNames(['DarkGoldenRod', 'WhiteSmoke', 'LavenderBlush', 'Pal
 <section id='solution'>
 
 ```js
-// solution required
+function htmlColorNames(arr) {
+  arr.splice(0,2,'DarkSalmon', 'BlanchedAlmond');
+  return arr;
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-key-value-pairs-to-javascript-objects.english.md

@@ -69,6 +69,16 @@ console.log(foods);
 <section id='solution'>
 
 ```js
-// solution required
+let foods = {
+  apples: 25,
+  oranges: 32,
+  plums: 28
+};
+
+// change code below this line
+foods['bananas'] = 13;
+foods['grapes']  = 35;
+foods['strawberries'] = 27;
+// change code above this line
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md

@@ -62,6 +62,10 @@ console.log(quickCheck(['squash', 'onions', 'shallots'], 'mushrooms'));
 <section id='solution'>
 
 ```js
-// solution required
+function quickCheck(arr, elem) {
+  // change code below this line
+  return arr.indexOf(elem) >= 0; 
+  // change code above this line
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-array-items-using-slice.english.md

@@ -56,6 +56,8 @@ console.log(forecast(['cold', 'rainy', 'warm', 'sunny', 'cool', 'thunderstorms']
 <section id='solution'>
 
 ```js
-// solution required
+function forecast(arr) {
+  return arr.slice(2,4);
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/create-complex-multi-dimensional-arrays.english.md

@@ -68,6 +68,14 @@ let myNestedArray = [
 <section id='solution'>
 
 ```js
-// solution required
+let myNestedArray = [
+  // change code below this line
+  ['unshift', ['deep', ['deeper', ['deepest']]],false, 1, 2, 3, 'complex', 'nested'],
+  ['loop', 'shift', 6, 7, 1000, 'method'],
+  ['concat', false, true, 'spread', 'array'],
+  ['mutate', 1327.98, 'splice', 'slice', 'push'],
+  ['iterate', 1.3849, 7, '8.4876', 'arbitrary', 'depth']
+  // change code above this line
+];
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/iterate-through-all-an-arrays-items-using-for-loops.english.md

@@ -65,6 +65,16 @@ console.log(filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3));
 <section id='solution'>
 
 ```js
-// solution required
+function filteredArray(arr, elem) {
+  let newArr = [];
+  // change code below this line
+  for (let i = 0; i<arr.length; i++) {
+    if (arr[i].indexOf(elem) < 0) {
+      newArr.push(arr[i]);
+    }
+  }
+  // change code above this line
+  return newArr;
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-array-stored-in-an-object.english.md

@@ -75,6 +75,29 @@ console.log(addFriend(user, 'Pete'));
 <section id='solution'>
 
 ```js
-// solution required
+let user = {
+  name: 'Kenneth',
+  age: 28,
+  data: {
+    username: 'kennethCodesAllDay',
+    joinDate: 'March 26, 2016',
+    organization: 'freeCodeCamp',
+    friends: [
+      'Sam',
+      'Kira',
+      'Tomo'
+    ],
+    location: {
+      city: 'San Francisco',
+      state: 'CA',
+      country: 'USA'
+    }
+  }
+};
+
+function addFriend(userObj, friend) {
+  userObj.data.friends.push(friend);
+  return userObj.data.friends;
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-object-nested-within-an-object.english.md

@@ -66,6 +66,15 @@ console.log(userActivity);
 <section id='solution'>
 
 ```js
-// solution required
+let userActivity = {
+  id: 23894201352,
+  date: 'January 1, 2017',
+  data: {
+    totalUsers: 51,
+    online: 42
+  }
+};
+
+userActivity.data.online = 45;
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-from-an-array-with-pop-and-shift.english.md

@@ -60,6 +60,10 @@ console.log(popShift(['challenge', 'is', 'not', 'complete']));
 <section id='solution'>
 
 ```js
-// solution required
+function popShift(arr) {
+  let popped = arr.pop(); // change this line
+  let shifted = arr.shift(); // change this line
+  return [shifted, popped];
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-using-splice.english.md

@@ -59,6 +59,9 @@ console.log(sumOfTen([2, 5, 1, 5, 2, 1]));
 <section id='solution'>
 
 ```js
-// solution required
+function sumOfTen(arr) {
+  arr.splice(2,2);
+  return arr.reduce((a, b) => a + b);
+}
 ```
 </section>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-an-array-to-store-a-collection-of-data.english.md

@@ -57,6 +57,6 @@ let yourArray; // change this line
 <section id='solution'>
 
 ```js
-// solution required
+let yourArray = ['a string', 100, true, ['one', 2], 'another string'];
 ```
 </section>