Implementation of Array.indexOf for Iridium Mobile

iridium_array_indexof.js

if (!Array.prototype.indexOf) {

    Array.prototype.indexOf = function(searchElement, fromIndex) {
        var k;
        
        if (this == null) {
            throw new TypeError('"this" is null or not defined');
        }

        var O = Object(this);

        var len = O.length >>> 0;

        if (len === 0) {
            return -1;
        }

        var n = +fromIndex || 0;

        if (Math.abs(n) === Infinity) {
            n = 0;
        }
        if (n >= len) {
            return -1;
        }

        k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

        while (k < len) {
            if (k in O && O[k] === searchElement) {
                return k;
            }
            k++;
        }
        return -1;
    };
}