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Run results for: js array copy speed comparison - spread

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0
Firefox 135
Windows
Desktop
one month ago
Test name Executions per second
map 10653647.0 Ops/sec
array.from 4118789.2 Ops/sec
for loop 15137293.0 Ops/sec
foreach 13655042.0 Ops/sec
slice 13536197.0 Ops/sec
spread 7216431.0 Ops/sec
Tests:

  • map

    AخA
     
    const arr = [1,2,3,4,5]
    const newArr = arr.map(e=>e)

  • array.from

     
    const arr = [1,2,3,4,5]
    const newArr = Array.from(arr)

  • for loop

    ​x
     
    const arr = [1,2,3,4,5]
    let newArr = [];
    for(let i = 0; i < arr.length; i++) {
      newArr[i] = arr[i];
    }
    ​

  • foreach

     
    const arr = [1,2,3,4,5]
    let newArr = []
    arr.forEach(e => {
      newArr.push(e)
    })

  • slice

     
    const arr = [1,2,3,4,5]
    const newArr = arr.slice()

  • spread

     
    const arr = [1,2,3,4,5]
    const newArr = [...arr]