JavaScript prototypes

js_protos.js

/* Prototypes that work against primitives   */
String.prototype.trim = function() { return this.replace(/^\s+|\s+$/g, ''); };
String.prototype.contains = function(t) { return this.indexOf(t) >= 0 ? true : false; };
String.prototype.beginsWith = function(t, i) { if (i == false) { return (t == this.substring(0, t.length)); } else { return (t.toLowerCase() == this.substring(0, t.length).toLowerCase()); } };
String.prototype.startsWith = function(t, i) { if (i == false) { return (t == this.substring(0, t.length)); } else { return (t.toLowerCase() == this.substring(0, t.length).toLowerCase()); } };
String.prototype.endsWith = function(t, i) { if (i == false) { return (t == this.substring(this.length - t.length)); } else { return (t.toLowerCase() == this.substring(this.length - t.length).toLowerCase()); } };
String.prototype.format = function() { 
	var a = arguments; 
	if (a && a["0"] && a["0"] === "phone") {
		var input = ("" + this).numbers();
		switch(input.length) {
			case 10:
				return "(" + input.substr(0, 3) + ") " + input.substr(3, 3) + "-" + input.substr(6, 4);
			case 11:
				if (input.startsWith("1")) {
					input = input.substr(1, 10);
					return "(" + input.substr(0, 3) + ") " + input.substr(3, 3) + "-" + input.substr(6, 4);
				}
			case 12:
				if (input.startsWith("+1")) {
					input = input.substr(2, 10);
					return "(" + input.substr(0, 3) + ") " + input.substr(3, 3) + "-" + input.substr(6, 4);
				}
			default:
		}
		return input; 		// No matches
	}
	else {
		a["{"] = "{"; a["}"] = "}"; 
		return this.replace(/{({|}|-?[0-9]+)}/g, function(c) { var b = a[c.substring(1, c.length - 1)]; return typeof b == "undefined" ? "" : b }) 
	}
};
Array.prototype.contains = function(val) { return this.includes(val); };
String.prototype.numbers = function(a) { 
	var hit = ("" + this).trim().match(/\d+/g);
	if (hit) {
		return a ? hit.map(Number) : hit.map(Number).join(''); 
	}
	else {
		return "";		
	}
}