Run results for: Array.reduce vs for loop vs Array.forEach vs decrement while 2

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

decrement while

10K/s

forEach

9K/s

reduce

7K/s

for loop

0/s

View exact numbers

Test name	Executions per second
✓ decrement while	9,929 Ops/sec
forEach	9,286 Ops/sec
reduce	7,178 Ops/sec
for loop	0 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, index) {
	accum[curr] = index;
  	return accum;
}

function doRedeuce(pArray) {
	return pArray.reduce(reduceCallback, {});
}
function doLoop(pArray) {
	var accum = {};
	for(var intCtr=0; intCtr<pArray.length; intCtr++) {
		accum[pArray[index]] = index;
	}
	return accum;
}
function decrWhile(pArray) {
	var accum = {};
  	var index = pArray.length;
	while(index--) {
		accum[pArray[index]] = index;
	}
	return accum;
}
function doForEach(pArray) {
	var accum = {};
	pArray.forEach(function(item, index) {
		accum[item] = index;
	});
  return accum;
}

Tests:

reduce
var redeuceResult=0; redeuceResult = doRedeuce(arrRandom);
for loop
var loopResult=0; loopResult = doLoop(arrRandom);
forEach
var forEachResult=0; forEachResult = doForEach(arrRandom);
decrement while
var decrWhileResult=0; decrWhileResult = decrWhile(arrRandom);

Run results for: Array.reduce vs for loop vs Array.forEach vs decrement while 2

A test summing 1000 random numbers, 1 - 10000

reduce

for loop

forEach

decrement while