Run results for: Array.reduce vs for loop vs Array.forEach vs Lodash.reduce

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36

Browser: Chrome 81

Operating system: Mac OS X 10.15.4

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
reduce	67369.4 Ops/sec
for loop	1050920.0 Ops/sec
forEach	541821.4 Ops/sec
lodash.reduce	571016.5 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) {
	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 doForEach(pArray) {
	var accum = 0;
	pArray.forEach(function(item) {
		accum += item;
	});
}

function baseEach(collection, iteratee) {
  if (collection == null) {
    return collection
  }
  if (!isArrayLike(collection)) {
    return baseForOwn(collection, iteratee)
  }
  const length = collection.length
  const iterable = Object(collection)
  let index = -1

  while (++index < length) {
    if (iteratee(iterable[index], index, iterable) === false) {
      break
    }
  }
  return collection
}
function lodashReduce(collection, iteratee, accumulator) {
  const func = Array.isArray(collection) ? arrayReduce : baseReduce
  const initAccum = arguments.length < 3
  return func(collection, iteratee, accumulator, initAccum, baseEach)
}
function arrayReduce(array, iteratee, accumulator, initAccum) {
  let index = -1
  const length = array == null ? 0 : array.length

  if (initAccum && length) {
    accumulator = array[++index]
  }
  while (++index < length) {
    accumulator = iteratee(accumulator, array[index], index, array)
  }
  return accumulator
}
function doLodashReduce (pArray) {
  return lodashReduce(pArray, reduceCallback)
}

Tests:

reduce
var redeuceResult=0; redeuceResult = doRedeuce(arrRandom);
for loop
var loopResult=0; loopResult = doLoop(arrRandom);
forEach
var forEachResult=0 forEachResult = doForEach(arrRandom)
lodash.reduce
var lodashReduceResult = doLodashReduce(arrRandom)

Run results for: Array.reduce vs for loop vs Array.forEach vs Lodash.reduce

A test summing 1000 random numbers, 1 - 10000

reduce

for loop

forEach

lodash.reduce