var array = Array.from({ length: 100 }).map((val, i) => i);
var newArray = array.toSpliced(0, 0, 99);
var newArray = [99, ...array]
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