diff --git a/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional/index.md b/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional/index.md index 2f5b46ad82..fedc5c6082 100644 --- a/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional/index.md +++ b/guide/english/certifications/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional/index.md @@ -16,9 +16,9 @@ It can be quite complicated to understand what needs to be done. There are alway ### Relevant Links -* Arrays -* typeof -* arguments object +* [Arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) +* [Typeof](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof) +* [Arguments Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments) ## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1 @@ -92,7 +92,6 @@ In the case that only one argument was passed, do not worry about how to prompt // test here addTogether(2,3); ``` -![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") Run Code ### Code Explanation: @@ -105,65 +104,31 @@ In the case that only one argument was passed, do not worry about how to prompt #### Relevant Links -* typeof -* arguments object +* [Typeof](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof) +* [Arguments Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments) ## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution: ```javascript - function addTogether() { - var args = new Array(arguments.length); - //Storing the arguments in an array - for(var i = 0; i < args.length; ++i) { - args[i] = arguments[i]; - } - //Check for the arguments length - if(args.length == 2){ - //If there are two arguments,check for the type of both arguments - //Use typeof to check the type of the argument(both should be numbers) - if(typeof args[0] !== 'number' || typeof args[1] !=='number' ){ - return undefined; - } - return args[0]+args[1]; - } - //When only one argument is provided - if(args.length == 1){ - a= args[0]; - //Check the argument using typeof - if(typeof a!=='number'){ - return undefined; - } - else{ - //Making use of closures - return function(b){ - //Checking the second argument - if(typeof b !=='number'){ - return undefined; - } - else - return a+b; - }; - } - } - } - - // test here - addTogether(2,3); +function addTogether(first, second) { + if (typeof first !== 'number') { + return undefined; + } + const sum = second => (typeof second === 'number' ? first + second : undefined); + return typeof second === 'undefined' ? second => sum(second) : sum(second); +} +// test here +addTogether(2,3); ``` -![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") Run Code ### Code Explanation: -* First store the arguments in an array by creating an array using the constructor method. -* Adds each argument to the new array. -* Then check for the length of the new array as we need to know if we have enough or not. -* Check for the type of the arguments using `typeof` as they both should be numbers. -* Returns undefined if any of them is not a number, or returns the sum of them if they are. -* If there was only one argument, we still check the type after storing it in a new variable and returning a new function or undefined. +* Return `undefined` if first argument is not a `number` or second argument is defined, but not a `number`. +* Return sum of the arguments if both are provided otherwise return a sum function. #### Relevant Links -* typeof -* arguments object +* [Typeof](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof) +* [Arguments Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments) ## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution: ```javascript @@ -182,7 +147,6 @@ In the case that only one argument was passed, do not worry about how to prompt // test here addTogether(2,3); ``` -![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") Run Code ### Code Explanation: @@ -192,9 +156,9 @@ In the case that only one argument was passed, do not worry about how to prompt #### Relevant Links -* Array.prototype.reduce -* Array.prototype.some -* Array.from +* [Array.prototype.reduce](https://forum.freecodecamp.com/t/javascript-array-prototype-reduce/14299) +* [Array.prototype.some](https://forum.freecodecamp.com/t/javascript-array-prototype-some/14304) +* [Array.from](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from) ## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS: