What good does zero-fill bit-shifting by 0 do? (a >>> 0)

JavascriptBitwise Operators

Javascript Problem Overview

I just came across this piece in the Mozilla Javascript documentation:

var len = this.length >>> 0;

I don't quite understand why this is being done. What good does zero-fill right shifting this.length by 0 do? As far as I understand, it does exactly nothing. Is it to safely establish a default value for len, even if this.length is not an integer? Can this ever feasibly be the case? If so, what's the difference between >> 0 and >>> 0?

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