Complete the countingSort function

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Complete the countingSort function in the editor below.

countingSort has the following parameter(s):

arr[n]: an array of integers

Returns

int[100]: a frequency array

'use strict';

const fs = require('fs');

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

let inputString = '';
let currentLine = 0;

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

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

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

/*
 * Complete the 'countingSort' function below.
 *
 * The function is expected to return an INTEGER_ARRAY.
 * The function accepts INTEGER_ARRAY arr as parameter.
 */

function countingSort(arr) {
   let counts=[];
   // n case below 
for(let i=0;i<100;i++){
    counts[i]=0;
}
for(let j=0;j<arr.length;j++){
    if(arr[j]<100){
       counts[arr[j]]+=1;
    }
}
return counts;


}

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

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

    const arr = readLine().replace(/\s+$/g, '').split(' ').map(arrTemp => parseInt(arrTemp, 10));

    const result = countingSort(arr);

    ws.write(result.join(' ') + '\n');

    ws.end();
}

Function Description