var test = [1,2,3,4];
var c;
if (test instanceof Array) { c++; }
if (Array.isArray(test)) { c++; }
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