Hackerrank | 10 Days of Javascript | Day 4-Solution in JS | Count-Objects-Hackerrank-Solution-in-JS

Hackerrank | 10 Days of Javascript | Day 4-Solution in JS | Count-Objects-Hackerrank-Solution-in-JS

Objective

In this challenge, we learn about iterating over objects. Check the attached tutorial for more details.

Task

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

Input Format

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

Constraints

Output Format

Return a count of the total number of objects  such that . 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  objects in the  array:

Because we have two objects  that satisfy  (i.e.,  and ), we return  as our answer.

https://www.hackerrank.com/challenges/js10-count-objects/problem

Day 4: Count Objects Solution in JS

'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));
}