Time things with Javascript

Question

How can i time how much time passes between 2 events with javascript? like, to the millisecond?

Answer 1

When performing arithmetic operations on Date objects, they are implicitly converted to milliseconds (since 1970-01-01 00:00:00 UTC), so all you need to do is subtract a Date created when the operation started from a Date created when the operation ends.

var start = new Date();
doSomeHeavyWork();
var end = new Date();
var millisecondsElapsed = end - start;

Answer 2

Easiest way to do this.

console.time("timer name")
console.timeEnd("timer name")

This will output the time in milliseconds to the console.