Day 4: Count Objects | 10 Days Of JavaScript | HackerRank Solution

Hello coders, today we are going to solve Day 4: Count Objects HackerRank Solution which is a part of 10 Days of JavaScript Series.

Objective

In this challenge, we learn about iterating over objects.

Task

Complete the function in the editor. It has one parameter: an array, a, of objects. Each object in the array has two integer properties denoted by x and y. The function must return a count of all such objects o in array a that satisfy o.x == o.y.

Input Format

The first line contains an integer denoting n.
Each of the n subsequent lines contains two space-separated integers describing the values of x and y.

Constraints

• 5 <= n <= 10
• 1 <= x, y <= 100

Output Format

Return a count of the total number of objects o such that o.x == o.y. Locked stub code in the editor prints the returned value to STDOUT.

Sample Input 0

5
1 1
2 3
3 3
3 4
4 5

Sample Output 0

2

Explanation 0

There are n = 5 objects in the objects array:

• objects0 = {x: 1, y: 1}
• objects1 = {x: 2, y: 3}
• objects2 = {x: 3, y: 3}
• objects3 = {x: 3, y: 4}
• objects4 = {x: 4, y: 5}

Because we have two objects o that satisfy o.x == o.y(i.e., objects0 and objects2), we return 2 as our answer.

Solution – Day 4: Count Objects

'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++];
}

/*
 * Return a count of the total number of objects 'o' satisfying o.x == o.y.
 * 
 * Parameter(s):
 * objects: an array of objects with integer properties 'x' and 'y'
 */
function getCount(objects) {
    var count = 0;
    for (var index in objects){
        if (objects[index].x == objects[index].y){
            count++;
        }
    }
    return count;
}



function main() {
    const n = +(readLine());
    let objects = [];
    
    for (let i = 0; i < n; i++) {
        const [a, b] = readLine().split(' ');
        
        objects.push({x: +(a), y: +(b)});
    }
    
    console.log(getCount(objects));
}

Disclaimer: The above Problem (Count Objects) is generated by Hacker Rank but the Solution is provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.