Run results for: Array.reduce vs for loops vs Array.forEach

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36

Browser: Chrome 86

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
reduce	549318.0 Ops/sec
for loop	569148.4 Ops/sec
forEach	306032.2 Ops/sec
for-of loop	292495.4 Ops/sec

Script Preparation code:

// Create an array of 1000 random intergers between 1 and 10000
var arrRandom = [];
for(var intCtr=0; intCtr<1000; intCtr++) {
  arrRandom.push(Math.floor(Math.random() * Math.floor(10000)));
}

function doRedeuce(pArray) {
	return pArray.reduce(function(accum, curr) {
	    return accum+curr;
    });
}
function forLoop(pArray) {
	var accum = 0;
	for(var intCtr=0; intCtr<pArray.length; intCtr++) {
		accum += pArray[intCtr];
	}
	return accum;
}
function forOfLoop(pArray) {
	var accum = 0;
	for (var item of pArray) {
		accum += item;
	}
	return accum;
}
function doForEach(pArray) {
	var accum = 0;
	pArray.forEach(function(item) {
		accum += item;
	});
}

Tests:

reduce
var redeuceResult=0; redeuceResult = doRedeuce(arrRandom);
for loop
var loopResult=0; loopResult = forLoop(arrRandom);
forEach
var forEachResult=0 forEachResult = doForEach(arrRandom)
for-of loop
var loopResult=0; loopResult = forOfLoop(arrRandom);

Run results for: Array.reduce vs for loops vs Array.forEach

A test summing 1000 random numbers, 1 - 10000

reduce

for loop

forEach

for-of loop