Run results for: Looping over an array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0

Browser: Firefox 74

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

var array = new Array(100);
for (var i = 0; i < 100; ++i) array[i] = i;

Tests:

for var
for (var i = 0; i < array.length; ++i) { array[i] = i % 2; }
for let
for (let i = 0; i < array.length; ++i) { array[i] = i % 2; }
for var cached length
for (var i = 0, l = array.length; i < l; ++i) { array[i] = i % 2; }
for let cached length
for (let i = 0, l = array.length; i < l; ++i) { array[i] = i % 2; }
forEach function
array.forEach(function(v, i) { array[i] = i % 2; });
forEach arrow
array.forEach((v, i) => { array[i] = i % 2; });
some function
array.some(function(v, i) { array[i] = i % 2; });
some arrow
array.some((v, i) => { array[i] = i % 2; });
for...of var
for (var i of array) { array[i] = i % 2; }
for...of const
for (const i of array) { array[i] = i % 2; }