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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Browser: Chrome 73

Operating system: Mac OS X 10.14.3

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
reduce	77945.7 Ops/sec
for loop	1308241.0 Ops/sec
forEach	953256.1 Ops/sec
decrement while	567253.1 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