JSFiddle - React, Tailwind, and code Playground

JavaScript

function bench(func) {
  var date = new Date()
  start = date.getTime();

  for(var i = 0; i < 10000; i++) {
    func();
  }

  date = new Date();
  console.log(func, date - start);
}

function forLoop() {

    var counter = 0;
    for(var i = 0; i < 10; i++) {
      counter += 1;
    }

    return counter;

}

bench(forLoop);