Benchmark: Array.reduce vs for loops vs Array.forEach

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);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce
for loop
forEach
for-of loop

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36

Browser/OS: Chrome 97 on Linux

View result in a separate tab

Test name	Executions per second
reduce	883779.8 Ops/sec
for loop	1207837.0 Ops/sec
forEach	475096.1 Ops/sec
for-of loop	477270.0 Ops/sec

Array.reduce vs for loops vs Array.forEach (version: 0)

A test summing 1000 random numbers, 1 - 10000

Comparing performance of: reduce vs for loop vs forEach vs for-of loop

Created: 3 years ago by: Guest

Jump to the latest result

reduce

for loop

forEach

for-of loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A