Run results for: loops-forin-forof-native-4

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36

Browser: Chrome 73

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
for-in	148.4 Ops/sec
for-of	15240.2 Ops/sec
native	86.7 Ops/sec
native - cache lengh	186.9 Ops/sec

Script Preparation code:

var arr = [];
const randomizeArray = () => {
	for	(let i = 0; i < 50000; i++) {
		arr[i] = Math.floor(Math.random() * 100000);
	}
}

randomizeArray();

​x
 
var arr = [];const randomizeArray = () => {    for (let i = 0; i < 50000; i++) {        arr[i] = Math.floor(Math.random() * 100000);    }}​randomizeArray();

Tests:

for-in

let	dummy = 0;
for (let j = 0; j < 100; j++){
		for	(let i in arr) {
			dummy += i;
		}
}

 
let dummy = 0;for (let j = 0; j < 100; j++){        for (let i in arr) {            dummy += i;        }}

for-of

let	dummy = 0;
for (let j = 0; j < 100; j++){
		for	(let i of arr) {
			dummy += i;
		}
}

 
let dummy = 0;for (let j = 0; j < 100; j++){        for (let i of arr) {            dummy += i;        }}

native

let	dummy = 0;
for (let j = 0; j < 100; j++){
		for	(let i = 0; i < arr.length; i++) {
			dummy += arr[i];
		}
}

 
let dummy = 0;for (let j = 0; j < 100; j++){        for (let i = 0; i < arr.length; i++) {            dummy += arr[i];        }}

native - cache lengh

let	dummy = 0;
for (let j = 0; j < 100; j++){
		let length = arr.length;
		for	(let i = 0; i < length; i++) {
			dummy += arr[i];
		}
}

 
let dummy = 0;for (let j = 0; j < 100; j++){        let length = arr.length;        for (let i = 0; i < length; i++) {            dummy += arr[i];        }}