Day 1: 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 1: Functions – Hacker Rank Solution

Day 1: Functions– Hacker Rank Solution

Problem:

Objective

Today, we’re discussing JavaScript functions. Check out the attached tutorial for more details.

Task

Implement a function named factorial that has one parameter: an integer, . It must return the value of  (i.e.,  factorial).

Input Format

Locked stub code in the editor reads a single integer, , from stdin and passes it to a function named factorial.

Constraints

image 8

Output Format

The function must return the value of .

Sample Input 0

4

Sample Output 0

24

Explanation 0

image 9
Day 1: Functions – Hacker Rank Solution
function factorial(n) {
  return n ? n * factorial(n - 1) : 1;
}

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