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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/120.0

Browser: Firefox 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

for loop

1.3M/s

forEach

956K/s

reduce

647K/s

decrement while

239K/s

View exact numbers

Test name	Executions per second
✓ for loop	1,250,990 Ops/sec
forEach	956,210 Ops/sec
reduce	646,813 Ops/sec
decrement while	238,803 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 decrWhile(pArray) {
	var accum = 0;
  	var index = pArray.length;
	while(index--) {
		accum += pArray[index];
	}
	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 = decrWhile(arrRandom)
decrement while
var decrWhileResult=0; decrWhileResult = doForEach(arrRandom)

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

A test summing 1000 random numbers, 1 - 10000

reduce

for loop

forEach

decrement while