String.allIndexOf() & Array.allIndexOf()

gistfile1.js

(function(){
/*
String.allIndexOf(searchstring, ignoreCase)
	String [String] - the string to search within for the searchstring
	searchstring [String] - the desired string with which to find starting indexes
	ignoreCase [Boolean] - set to true to make both the string and searchstring case insensitive
Use:
	var s = "The rain in Spain stays mainly in the plain";
	s.allIndexOf("ain"); // result [ 5,14,25,40 ]
	s.allIndexOf("the"); // result [ 34 ]
	s.allIndexOf("THE", true); // result [ 0,34 ]
Demo:
	http://wowmotty.blogspot.com/2011/10/get-all-indexof-search-string.html
*/
String.prototype.allIndexOf = function(string, ignoreCase) {
	if (this === null) { return [-1]; }
	var t = (ignoreCase) ? this.toLowerCase() : this,
	s = (ignoreCase) ? string.toString().toLowerCase() : string.toString(),
	i = this.indexOf(s),
	len = this.length,
	n,
	indx = 0,
	result = [];
	if (len === 0 || i === -1) { return [i]; } // "".indexOf("") is 0
	for (n = 0; n <= len; n++) {
		i = t.indexOf(s, indx);
		if (i !== -1) {
			indx = i + 1;
			result.push(i);
		} else {
			return result;
		}
	}
	return result;
}

/*
Array.allIndexOf(searchElement)
	Array [Array] - the array to search within for the searchElement
	searchElement [String] - the desired element with which to find starting indexes
Use:
	var s = ["red","green","blue","red","yellow","blue","green","purple","red"];
	s.allIndexOf("orange"); // result [ -1 ]
	s.allIndexOf("red"); // result [ 0,3,8 ]
	s.allIndexOf("blue"); // result [ 2,5 ]
Demo: 
	http://wowmotty.blogspot.com/2011/10/get-all-indexof-from-array.html
*/
Array.prototype.allIndexOf = function(searchElement) {
	if (this === null) { return [-1]; }
	var len = this.length,
	hasIndexOf = Array.prototype.indexOf, // you know, because of IE
	i = (hasIndexOf) ? this.indexOf(searchElement) : 0,
	n,
	indx = 0,
	result = [];
	if (len === 0 || i === -1) { return [-1]; }
	if (hasIndexOf) {
		// Array.indexOf does exist
		for (n = 0; n <= len; n++) {
			i = this.indexOf(searchElement, indx);
			if (i !== -1) {
				indx = i + 1;
				result.push(i);
			} else {
				return result;
			}
		}
		return result;
	} else {
	// Array.indexOf doesn't exist
		for (n = 0; n <= len; n++) {
			if (this[n] === searchElement) {
				result.push(n);
			}
		}
		return (result.length > 0) ? result : [-1];
	}
};

})();