Possible Duplicate:

javascript >>> operator?

JavaScript triple greater than

Found this operator in such line of code:

var t = Object(this),

        len = t.length >>> 0;

What does this operator mean?

Full code is below. It is the code of JS some method:

if (!Array.prototype.some) {

  Array.prototype.some = function(fun /*, thisp */) {

    use strict;



    if (this == null) throw new TypeError();



    var t = Object(this),

        len = t.length >>> 0;



    if (typeof fun != function) throw new TypeError();



    var thisp = arguments[1];



    for (var i = 0; i < len; i++) {

      if (i in t && fun.call(thisp, t[i], i, t))

        return true;

    }



    return false;

  };

}