Run results for: JavaScript Array Copy 2

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 130

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Array.slice

4.7M/s

Slice with begin argument

4.7M/s

Array.concat

4.6M/s

Spread operator

4.4M/s

Array.from

3.5M/s

Slice with begin and end argument

2.8M/s

While loop

227K/s

For loop with declared length

217K/s

For loop

142K/s

View exact numbers

Test name	Executions per second
✓ Array.slice	4,734,883 Ops/sec
Slice with begin argument	4,698,656 Ops/sec
Array.concat	4,649,054 Ops/sec
Spread operator	4,433,834 Ops/sec
Array.from	3,519,932 Ops/sec
Slice with begin and end argument	2,841,522 Ops/sec
While loop	227,307 Ops/sec
For loop with declared length	216,816 Ops/sec
For loop	141,942 Ops/sec

Script Preparation code:

var arrayToCopy = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ];
var shallowCopy = [];

Tests:

Array.concat
shallowCopy = arrayToCopy.concat();
Array.slice
shallowCopy = arrayToCopy.slice();
For loop
for (let i = 0; i < arrayToCopy.length; ++i) { shallowCopy.push(arrayToCopy[i]); }
For loop with declared length
var arrayLength = arrayToCopy.length; for (let i = 0; i < arrayLength; ++i) { shallowCopy.push(arrayToCopy[i]); }
While loop
let i = arrayToCopy.length - 1; while (i--) { shallowCopy.push(arrayToCopy[i]); }
Spread operator
shallowCopy = [...arrayToCopy];
Slice with begin argument
shallowCopy = arrayToCopy.slice(0);
Slice with begin and end argument
shallowCopy = arrayToCopy.slice(0, arrayToCopy.length);
Array.from
shallowCopy = Array.from(arrayToCopy);