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Run results for: array[array.length - 1] vs array.at(-1) v2

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Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/136.2 Mobile/15E148 Safari/605.1.15
Mobile Safari 18
iOS 18.3.2
Mobile
24 days ago
Test name Executions per second
array[array.length - 1] 456637088.0 Ops/sec
array.at(-1) 483425184.0 Ops/sec
array[array.length - 1] fn 427288032.0 Ops/sec
array.at(-1) fn 394820736.0 Ops/sec
Script Preparation code:
​x
 
var array = [1, 2, 3];
​
function last1(array) {
    return array[array.length - 1]
}
​
function last2(array) {
    return array.at(-1)
}
Tests:

  • array[array.length - 1]

     
    var d = array[array.length - 1];

  • array.at(-1)

     
    var z = array.at(-1);

  • array[array.length - 1] fn

     
    var x = last1(array);

  • array.at(-1) fn

     
    var y = last2(array);