This is Mozilla's Code in Mozilla's Array.prototype.indexOf
if (!Array.prototype.indexOf)
{
Array.prototype.indexOf = function(elt)
{
var len = this.length >>> 0; // What does ">>>" do?
var from = Number(arguments[1]) || 0;
from = (from < 0) ? Math.ceil(from): Math.floor(from);
if (from < 0)from += len;
for (; from < len; from++)
{
if (from in this && this[from] === elt)return from;
}
return -1;
};
}
I don't understand some of the syntax.
What does ">>>" do in the above code?