HackerRank Day 4: Create a Rectangle Object 10 days of javascript solution

In this Day 4: Create a Rectangle Object 10 days of javascript problem you need to complete the function in the editor. It has two parameters: a and b. It must return an object modeling a rectangle that has the following properties:

1. the length that is equal to a.
2. width: that is equal to b.
3. perimeter: that is equal to 2*(a+b)
4. area: that is equal to a*b

HackerRank Day 4: Create a Rectangle Object 10 days of javascript problem solution.

'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.trim().split('\n').map(string => {
        return string.trim();
    });
    
    main();    
});

function readLine() {
    return inputString[currentLine++];
}

/*
 * Complete the Rectangle function
 */
function Rectangle(a, b) {
  this.length = a;
  this.width = b;
  this.area = a * b;
  this.perimeter = 2 * (a + b);
}


function main() {
    const a = +(readLine());
    const b = +(readLine());
    
    const rec = new Rectangle(a, b);
    
    console.log(rec.length);
    console.log(rec.width);
    console.log(rec.perimeter);
    console.log(rec.area);
}