Run results for: for vs foreach vs some vs for..of vs for cached length non empty array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.72 Safari/537.36

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for	363.9 Ops/sec
for cached length	760.0 Ops/sec
some	136.3 Ops/sec
for..of	144.9 Ops/sec
foreach	146.0 Ops/sec

Script Preparation code:

var a = new Array(10000);


for(i=0; i<10000; i++){
    a[i] = ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16));
}

Tests:

for
for (var i = 0; i < a.length; i++) { a[i]; }
for cached length
for (var i = 0, l=a.length; i < l; ++i) { a[i]; }
some
a.some(function(i) { a[i]; });
for..of
for (var i of a) { a[i]; }
foreach
a.forEach(function(i) { a[i]; });

Run results for: for vs foreach vs some vs for..of vs for cached length non empty array

Compare loop performance

for

for cached length

some

for..of

foreach