MeasureThat.net

Run results for: Array: [] vs at() last index

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0
Chrome 133
Windows
Desktop
one month ago
Test name Executions per second
Array[] array.length - 1 34375700.0 Ops/sec
Array.at() -1 35951580.0 Ops/sec
Array[] cached array.length - 1 33454528.0 Ops/sec
Script Preparation code:
AخA
 
var size = 0xffffff;
var data = Array.from({length: size}, (_, index) => index);
Tests:

  • Array[] array.length - 1

     
    let sum = 0;
    for (let i; i < size; i++) {
      sum += data[array.length - 1];
    }

  • Array.at() -1

     
    let sum = 0;
    for (let i; i < size; i++) {
      sum += data.at(-1);
    }

  • Array[] cached array.length - 1

     
    let sum = 0;
    let length = data.length;
    for (let i; i < size; i++) {
      sum += data[length -1];
    }