Sandbox::https://github.com/prabaprakash/Hackerrank-JavaScript-Solutions/blob/master/priyanka-and-toys.js

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'use strict';

const fs = require('fs');

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.replace(/\s*$/, '')

.split('\n')

.map(str => str.replace(/\s*$/, ''));

main();

});

function readLine() {

return inputString[currentLine++];

}

// Complete the toys function below.

function toys(w) {

w = w.sort((x,y)=>x-y);

let count = 1;

let check = w.shift() + 4;

w.forEach(x => {

if (x > check) {

count++;

check = x + 4;

}

});

return count;

}

function main() {

const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

const n = parseInt(readLine(), 10);

const w = readLine().split(' ').map(wTemp => parseInt(wTemp, 10));

let result = toys(w);

ws.write(result + "\n");

ws.end();

}