Run results for: Spread vs concat vs forEach array v1001

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser: Chrome 107

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
concat	1003.8 Ops/sec
forEach	818.7 Ops/sec
spread	1041.4 Ops/sec

Tests:

concat

const arr1 = Array.from({ length: 5000}).map((_, i) => i);
const arr2 = Array.from({ length: 5000}).map((_, i) => i);
const arr3 = Array.from({ length: 5000}).map((_, i) => i);

const finallArr1 = arr1.concat(arr2).concat(arr3);

​x
 
const arr1 = Array.from({ length: 5000}).map((_, i) => i);const arr2 = Array.from({ length: 5000}).map((_, i) => i);const arr3 = Array.from({ length: 5000}).map((_, i) => i);​const finallArr1 = arr1.concat(arr2).concat(arr3);

forEach

const arr1 = Array.from({ length: 5000}).map((_, i) => i);
const arr2 = Array.from({ length: 5000}).map((_, i) => i);
const arr3 = Array.from({ length: 5000}).map((_, i) => i);

const finalArr2 = [];

arr1.forEach((e) => finalArr2.push(e)); 
arr2.forEach((e) => finalArr2.push(e)); 
arr3.forEach((e) => finalArr2.push(e));

 
const arr1 = Array.from({ length: 5000}).map((_, i) => i);const arr2 = Array.from({ length: 5000}).map((_, i) => i);const arr3 = Array.from({ length: 5000}).map((_, i) => i);​const finalArr2 = [];​arr1.forEach((e) => finalArr2.push(e)); arr2.forEach((e) => finalArr2.push(e)); arr3.forEach((e) => finalArr2.push(e)); 

spread

const arr1 = Array.from({ length: 5000}).map((_, i) => i);
const arr2 = Array.from({ length: 5000}).map((_, i) => i);
const arr3 = Array.from({ length: 5000}).map((_, i) => i);

const finalArr3 = [...arr1, ...arr2, ...arr3];

 
const arr1 = Array.from({ length: 5000}).map((_, i) => i);const arr2 = Array.from({ length: 5000}).map((_, i) => i);const arr3 = Array.from({ length: 5000}).map((_, i) => i);​const finalArr3 = [...arr1, ...arr2, ...arr3];