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

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; CLT-L29 Build/HUAWEICLT-L29) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.99 Mobile Safari/537.36 OPR/50.2.2426.136249

Browser: Opera Mobile 50

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
reduce	17272.6 Ops/sec
for loop	153906.4 Ops/sec
forEach	66191.9 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 reduceCallback(accum, curr) {
	return accum+curr;
}

function doRedeuce(pArray) {
	return pArray.reduce(reduceCallback);
}
function doLoop(pArray) {
	var accum = 0;
	for(var intCtr=0; intCtr<pArray.length; intCtr++) {
		accum += pArray[intCtr];
	}
	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 = doLoop(arrRandom);
forEach
var forEachResult=0 forEachResult = doForEach(arrRandom)

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

A test summing 1000 random numbers, 1 - 10000

reduce

for loop

forEach