Run results for: Array.reduce vs for loop vs Array.forEach vs decrement while 3

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36

Browser: Chrome 73

Operating system: Mac OS X 10.14.0

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
reduce	3628.8 Ops/sec
for loop	3831.2 Ops/sec
forEach	3501.2 Ops/sec
decrement while	3827.5 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 index=0; index<pArray.length; index++) {
		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 = doRedeuce(arrRandom);
for loop
var loopResult = doLoop(arrRandom);
forEach
var 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 3

A test summing 1000 random numbers, 1 - 10000

reduce

for loop

forEach

decrement while