Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.72 Safari/537.36
Chrome 89
Windows
Desktop
3 years ago
Test name Executions per second
new array 16466409.0 Ops/sec
mutation 5740286.0 Ops/sec
Tests:
  • new array

    AخA
     
    const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    const arr1 = [0, ...arr];
  • mutation

     
    const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    arr.unshift(0);