Day 4: Count Objects :- 10 Days Of Javascript HackerRank Solution

Problem:-

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.

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++];

}

/*

* 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) {

return objects.filter(function (o) { return o.x == o.y }).length

}

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));

}