What is the JavaScript operator and how do you use it?

Question

I was looking at code from Mozilla that add a filter method to Array and it had a line of code that confused me.

var len = this.length >>> 0;

I have never seen >>> used in JavaScript before.
What is it and what does it do?

user_6187114 · Answer

Sample Java Code below explains well:

int x = 64;

System.out.println("x >>> 3 = "  + (x >>> 3));
System.out.println("x >> 3 = "  + (x >> 3));
System.out.println(Integer.toBinaryString(x >>> 3));
System.out.println(Integer.toBinaryString(x >> 3));

Output is the following:

x >>> 3 = 536870904
x >> 3 = -8
11111111111111111111111111000
11111111111111111111111111111000

What is the JavaScript >>> operator and how do you use it?

7 Answers