Day 1: Let and Const in Javascript | 10 Days Of JavaScript Solutions | HackerRank Programming Solutions [💯Correct]

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10 Days Of Javascript Hackerrank Solutions

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In this post, you will find the solution for Day 1: Let and Const in JavaScript-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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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 Problem – Day 1: Let and Const – Hacker Rank Solution 

Day 1: Let and Const – Hacker Rank Solution

Problem:

Objective

In this challenge, we practice declaring variables using the let and const keywords. Check out the attached tutorial for more details.

Task

  1. Declare a constant variable, , and assign it the value Math.PI. You will not pass this challenge unless the variable is declared as a constant and named PI (uppercase).
  2. Read a number, , denoting the radius of a circle from stdin.
  3. Use  and  to calculate the  and  of a circle having radius .
  4. Print  as the first line of output and print  as the second line of output.

Input Format

A single integer, , denoting the radius of a circle.

Constraints

image 11

Output Format

Print the following two lines:

  1. On the first line, print the  area of the circle having radius .
  2. On the second line, print the perimeter  of the circle having radius .

Sample Input 0

2.6

Sample Output 0

21.237166338267002
16.336281798666924

Explanation 0

image 10
Day 1: Let and Const – Hacker Rank Solution
function main() {
    let r = readLine();
    const PI = Math.PI;
    console.log(PI * r * r);
    console.log(2 * PI * r);
}

33 thoughts on “Day 1: Let and Const in Javascript | 10 Days Of JavaScript Solutions | HackerRank Programming Solutions [💯Correct]”

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