utils: add isUndefined and alternate to merge, defaults.

lib/utils.js

@@ -1,6 +1,6 @@
 var self = module.exports = {
 	// Return the second value if the first value is undefined..
-	get: (obj1, obj2) => { return typeof obj1 === "undefined" ? obj2 : obj1; },
+	get: (obj1, obj2) => { return self.isUndefined(obj1) ? obj2 : obj1; },
 
 	// Value is a boolean..
 	isBoolean: (obj) => { return obj === true || obj === false || toString.call(obj) === "[object Boolean]"; },
@@ -17,6 +17,9 @@ var self = module.exports = {
 	// Value is null..
 	isNull: (obj) => { return obj === null; },
 
+	// Value is undefined..
+	isUndefined: (obj) => { return typeof obj === "undefined"; },
+
 	// Value is a regex..
 	isRegex: (str) => { return /[\|\\\^\$\*\+\?\:\#]/.test(str); },
 
@@ -111,6 +114,17 @@ var self = module.exports = {
 		return obj1;
 	},
 
+	// Merge two objects without replacing..
+	defaults: (obj1, obj2) => {
+		for (var p in obj2) {
+			try {
+				if (obj2[p].constructor == Object) { obj1[p] = self.defaults(obj1[p], obj2[p]); }
+				else if(self.isUndefined(obj1[p])) { obj1[p] = obj2[p]; }
+			} catch(e) { obj1[p] = obj2[p]; }
+		}
+		return obj1;
+	},
+
 	// Split a line but don't cut a word in half..
 	splitLine: (input, length) => {
 		var lastSpace = input.substring(0, length).lastIndexOf(" ");