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Run results for: Object arrays: findIndex vs for loop start from some index

Testing finding an object array via findIndex or by using a for loop starting from some index

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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
findIndex 3885.9 Ops/sec
for loop 38790.5 Ops/sec
Script Preparation code:
AخA
 
var arr = new Array(15000);
arr.fill({ id: 0 });
arr = arr.map((el, idx) => el.id = idx);
var foo = Math.floor(Math.random() * 15000);
var startIndex = 7500;
Tests:

  • findIndex

     
    arr.findIndex((m,i) => i >= startIndex  && m.id === foo);

  • for loop

     
    for (let i = startIndex; i < arr.length; i++) {
      if (arr[i].id === foo) break;
    }