var a = ['hello', 'a', 'bc', 'helloa'];
var b = a.indexOf('helloa');
var b = a.includes('helloa');
FAQ: FAQ
Source code: GitHub/MeasureThat.net
Report issues: MeasureThat.net/Issues
Based on: Benchmark.js
Facebook page: https://www.facebook.com/MeasureThat.Net
Python benchmarks support: Pyodide