Run results for: for i < length vs .forEach(t) vs for..of vs for t = array[i] vs for i = 0; i in array vs for i in array vs .reduce (Array)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:94.0) Gecko/20100101 Firefox/94.0

Browser: Firefox 94

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var array = [];
for (let i = 1; i <= 100000; i++) array.push(i);

Tests:

for i < length
for (let i = -1, length = array.length; ++i < length;) { window.t = array[i]; }
.forEach(t)
array.forEach(t => { window.t = t; });
for..of
for (let t of array) { window.t = t; }
for t = array[i]
for (let i = -1, t; t = array[++i];) { window.t = t; }
for i=0; i in array
for (let i = -1; ++i in array;) { window.t = array[i]; }
for i in array,
for (const i in array) { window.t = array[i]; }
.reduce
array.reduce((_, t) => { window.t = t; });