Run results for: Array.from vs native from

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

native from

142K/s

Array.from

19K/s

View exact numbers

Test name	Executions per second
✓ native from	141,595 Ops/sec
Array.from	19,409 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

  function from1(ArrayLike, map, thisArg) {
      return 'length' in ArrayLike ? map ? [].map.call(ArrayLike, map, thisArg) : [].slice.call(ArrayLike) : map ? Array.from(ArrayLike, map, thisArg) : [...ArrayLike]
  }
let from2 = Array.from
let arr = Array.from({length:1e3},(a,i)=>i),
    set = new Set(arr),
    generic = {length: 1e3}

Tests:

Array.from
from2(arr) from2(set) from2(generic)
native from
from1(arr) from1(set) from1(generic)