Benchmark: JS array lastIndexOf vs indexOf

Script Preparation code:

var a = [];
var i = 0;

while (i <= 1E5) {
  i++;
  // Put the two results same disance from start and end
  if(i === 1E5 - 1E4 || i === 1E4) str.push("match")
  else a.push(i)
}

Tests:

Array.lastIndexOf
const item = a.lastIndexOf("match");
Array.indexOf
const index = a.indexOf("match");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.lastIndexOf
Array.indexOf

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser/OS: Firefox 147 on Windows

View result in a separate tab

Test name	Executions per second
Array.lastIndexOf	188291.7 Ops/sec
Array.indexOf	128192.9 Ops/sec

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JS find + indexOf vs findIndex

JS array lastIndexOf vs indexOf (version: 1)

JS array lastIndexOf vs indexOf

Comparing performance of: Array.lastIndexOf vs Array.indexOf

Created: 3 months ago by: Guest

Jump to the latest result

Array.lastIndexOf

Array.indexOf

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A