Test different types of JavaScript looks for NodeJS v0.12.0

loopTest.js

'use strict';
var iterations = 1000000,
    outerIterations = 100;

function runit() {
    var ary
        ,result
        ,idx;
    ary = createData();
    console.log('Executing while loop with prefix incre in test condition');
    result = executeOuterLoop(whileLoopPrefixIncr, ary);
    printResult(result);
    console.log('Executing basic for loop');
    result = executeOuterLoop(forLoop, ary);
    printResult(result);
    console.log('Executing for loop with precomputed length');
    result = executeOuterLoop(forLoopPre, ary);
    printResult(result);
    console.log('Executing for loop with precomputed length and decr to zero');
    result = executeOuterLoop(forLoopPreDecr, ary);
    printResult(result);
    console.log('Executing while loop with precomputed length');
    result = executeOuterLoop(whileLoop, ary);
    printResult(result);
    console.log('Executing while loop with decr in test condition');
    result = executeOuterLoop(whileLoopDecr, ary);
    printResult(result);
	console.log('Executing iterating with #forEach function');
    result = executeOuterLoop(forEachFunc, ary);
    printResult(result);
	console.log('Executing iterating and creating new array with changes using map function');
    result = executeOuterLoop(mapFunc, ary);
    printResult(result);
}

function executeOuterLoop(loopFunc, ary) {
    var idx,
        sum = [0, 0],
        result;
    for (idx = 0; idx < outerIterations; idx++) {
        result = loopFunc(ary.slice(0));
        sum[0] += result[0];
        sum[1] += result[1];
    }
    sum[0] = sum[0] / outerIterations;
    sum[1] = sum[1] / outerIterations;
    return sum;
}

function printResult(diff) {
    console.log('Loop time was %d seconds and %d milliseconds', diff[0], diff[1] / 1000000);
}



function createData() {
    var idx
        ,retVal = [];
    for (idx = 0 ; idx < iterations; idx++) {
        retVal.push(Math.floor((Math.random() * 10) + 1));
    }
    return retVal;
}

function forLoop(ary) {
    var start
        ,diff
        ,idx;
    start = process.hrtime();
    for (idx = 0; idx < ary.length; idx++) {
        ary[idx] += 1;
    }
    diff = process.hrtime(start);
    return diff;
}

function forLoopPre(ary) {
    var start
        ,diff
        ,idx
        ,length;
    start = process.hrtime();
    length = ary.length;
    for (idx = 0; idx < length; idx++) {
        ary[idx] += 1;
    }
    diff = process.hrtime(start);
    return diff;
}

function forLoopPreDecr(ary) {
    var start
        ,diff
        ,idx
        ,length;
    start = process.hrtime();
    length = ary.length;
    for (idx = length - 1; idx >= 0; idx--) {
        ary[idx] += 1;
    }
    diff = process.hrtime(start);
    return diff;
}

function whileLoop(ary) {
    var start
        ,diff
        ,idx
        ,length;
    start = process.hrtime();
    length = ary.length;
    idx = 0;
    while (idx < length) {
        ary[idx] += 1;
        idx++;
    }
    diff = process.hrtime(start);
    return diff;
}

function whileLoopDecr(ary) {
    var start
        ,diff
        ,idx
        ,length;
    start = process.hrtime();
    idx = ary.length;
    while (idx--) {
        ary[idx] += 1;
    }
    diff = process.hrtime(start);
    return diff;
}

function whileLoopPrefixIncr(ary) {
    var start
        ,diff
        ,idx
        ,length;
    start = process.hrtime();
    idx = -1;
    length = ary.length;
    while (++idx < length) {
        ary[idx] += 1;
    }
    diff = process.hrtime(start);
    return diff;
}

function forEachFunc(ary) {
	var start
        ,diff
        ,idx
        ,length;
    start = process.hrtime();
    idx = -1;
	ary.forEach(function (val, curIdx, curAry) {
		curAry[curIdx] += 1;
	});
   
    diff = process.hrtime(start);
    return diff;
}

function mapFunc(ary) {
	var start
        ,diff
        ,idx
        ,length;
    start = process.hrtime();
    idx = -1;
	ary.map(function (val) {
		return val += 1;
	});
   
    diff = process.hrtime(start);
    return diff;
}

runit();