JavaScript triple greater than

Question

I saw this syntax on another StackOverflow post and was curious as to what it does:

var len = this.length >>> 0;

What does >&g

Answer 1

>>> is a bit-wise operator, zero-fill right shift.

I think the only effect of >>> 0 on a positive number is to round down to the nearest integer, same as Math.floor(). I don't see why this would be necessary in your example, as generally a .length property (e.g. of an Array) would be an integer already.

I've also seen the slightly shorter ~~ used in the same way: ~~9.5 == 9; // true.