Day 5: Arrow Functions in JavaScript | 10 Days Of JavaScript Solutions | HackerRank Programming Solutions [💯Correct]

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Introduction To JavaScript

JavaScript is a lightweight, cross-platform, and interpreted scripting language. It is well-known for the development of web pages, many non-browser environments also use it. JavaScript can be used for Client-side developments as well as Server-side developments. JavaScript contains a standard library of objects, like Array, Date, and Math, and a core set of language elements like operators, control structures, and statements.

Advantages of JavaScript

The merits of using JavaScript are −

  • Less server interaction − You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.
  • Immediate feedback to the visitors − They don’t have to wait for a page reload to see if they have forgotten to enter something.
  • Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.
  • Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.

Link for the ProblemDay 5: Arrow Functions – Hacker Rank Solution

Day 5: Arrow Functions – Hacker Rank Solution



In this challenge, we practice using arrow functions. Check the attached tutorial for more details.


Complete the function in the editor. It has one parameter: an array, . It must iterate through the array performing one of the following actions on each element:

  • If the element is even, multiply the element by .
  • If the element is odd, multiply the element by .

The function must then return the modified array.

Input Format

The first line contains an integer, , denoting the size of .
The second line contains  space-separated integers describing the respective elements of .


image 27

Output Format

Return the modified array where every even element is doubled and every odd element is tripled.

Sample Input 0

1 2 3 4 5

Sample Output 0

3 4 9 8 15

Explanation 0

image 26
Day 5: Arrow Functions – Hacker Rank Solution
function modifyArray(nums) {
  let newArr = [];
  for (let i = 0; i < nums.length; i++) {
    if (nums[i] % 2 === 0) {
      newArr.push(nums[i] * 2);
    } else {
      newArr.push(nums[i] * 3);
  return newArr;

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