Run results for: Loops in array and in object V2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for i++ array	856368.0 Ops/sec
while ++i array	868364.4 Ops/sec
for in array	523700.6 Ops/sec
for of array	8647803.0 Ops/sec
forEach array	7206679.0 Ops/sec
for in object	687447.2 Ops/sec
for of values object	2619440.2 Ops/sec
for of pre-initialized-values object	9102115.0 Ops/sec
forEach pre-initialized-values object	7505592.0 Ops/sec

Script Preparation code:

var _array = [9, 8, 7, 6, 5, 4, 3, 2, 1, 0];
var _object = { a: 9, b: 8, c: 7, d: 6, e: 5, f: 4, g: 3, h: 2, i: 1, j: 0 };
var _preInit_objValues = Object.values(_object);

Tests:

for i++ array
let value; let len = _array.length; for (let i = 0; i < len; i++) { value = _array[i]; }
while ++i array
let value; let i = -1; let len = _array.length; while (++i < len) { value = _array[i]; }
for in array
let value; for (let i in _array) { value = _array[i]; }
for of array
let value; for (const item of _array) { value = item; }
forEach array
let value; _array.forEach((item, i, arr) => value = item);
for in object
let value; for (let p in _object) { value = _object[p]; }
for of values object
let value; const values = Object.values(_object); for (const item of values) { value = item; }
for of pre-initialized-values object
let value; for (const item of _preInit_objValues) { value = item; }
forEach pre-initialized-values object
let value; _preInit_objValues.forEach((item, i, arr) => value = item);

Run results for: Loops in array and in object V2

for i++ array

while ++i array

for in array

for of array

forEach array

for in object

for of values object

for of pre-initialized-values object

forEach pre-initialized-values object