Benchmark: Looping through massive array

Looping through massive array (version: 0)

Script Preparation code:

var arr = new Array(99999);

Tests:

Basic for loop
for (var i=0; i<arr.length; i++) {}
For loop but caching the length
for (var i=0, len=arr.length; i<len; i++) {}
While loop that imitates a for loop
var i = 0; while (i<arr.length) { i++; }
While loop that imitates a for loop caching len
var i=0, len=arr.length; while (i<len) { i++; }
While loop in reverse simplifying the test
var i = arr.length; while (i--) {}
While looping by popping values
var x; while (x = arr.pop()) {}
for ... in loop
for (var i in arr) {}
for ... in loop with integer test
var isInt = /(\^[0-9]$)|(\^[1-9][0-9]+$)/; for (var i in arr) { if(!isInt.test(i)){continue;} }
For loop testing on existence rather than lengt
for (var i=0; arr[i]; i++) {}
For loop testing on existence plus array lookup
for (var i=0; arr[i]; i++) { var x = arr[i]; }
For testing on existence rather than length array
for (var i=0, x; x = arr[i++];) {}
For reference
for (var i=0, len=arr.length; i<len; i++) { var x = arr[i]; }
Array.forEach() native implementation.
arr.forEach(function(x){});
For reference against forEach()
var f=function(x){}; for (var i=0, len=arr.length; i<len; i++) { f(arr[i]); }

Rendered benchmark preparation results:

Previous results

Test case name	Result
Basic for loop
For loop but caching the length
While loop that imitates a for loop
While loop that imitates a for loop caching len
While loop in reverse simplifying the test
While looping by popping values
for ... in loop
for ... in loop with integer test
For loop testing on existence rather than lengt
For loop testing on existence plus array lookup
For testing on existence rather than length array
For reference
Array.forEach() native implementation.
For reference against forEach()

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser/OS: Chrome 67 on Windows

Test name	Executions per second
Basic for loop	84.0 Ops/sec
For loop but caching the length	13243.2 Ops/sec
While loop that imitates a for loop	85.8 Ops/sec
While loop that imitates a for loop caching len	13581.0 Ops/sec
While loop in reverse simplifying the test	10952.1 Ops/sec
While looping by popping values	6555792.0 Ops/sec
for ... in loop	7380762.0 Ops/sec
for ... in loop with integer test	7075249.0 Ops/sec
For loop testing on existence rather than lengt	7797103.0 Ops/sec
For loop testing on existence plus array lookup	7862445.0 Ops/sec
For testing on existence rather than length array	7607981.0 Ops/sec
For reference	7715309.0 Ops/sec
Array.forEach() native implementation.	7491631.0 Ops/sec
For reference against forEach()	7991576.0 Ops/sec