HackerRank / Plus Minus

hackerrank--plus-minus.js

'use strict';

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 'plusMinus' function below.
 *
 * The function accepts INTEGER_ARRAY arr as parameter.
 */

function plusMinus(arr) {
    let n = arr.length, posRatio = 0, negRatio = 0, zeroRatio = 0;
    
    const printDecimal = (num, places = 6) => {
        const pow_ = Math.pow(10, places);
        const num_ = (Math.round(num * pow_) / pow_).toFixed(places);
        
        console.log(num_);
    };
    
    for(let num of arr) {
        if (0 === num) {
            zeroRatio++;
        }
        else if (0 < num) {
            posRatio++;
        }
        else if (0 > num) {
            negRatio++;
        }
    }
    
    printDecimal(posRatio / n);
    printDecimal(negRatio / n);
    printDecimal(zeroRatio / n);
}

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

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

    plusMinus(arr);
}