update settings object merging

scripts/util/object.js

@@ -27,9 +27,39 @@ define(
 			return JSON.parse( JSON.stringify( obj ) );
 		}
 
+		function isEqual ( obj1, obj2 ) {
+			return JSON.stringify( obj1 ) === JSON.stringify( obj2 );
+		}
+
+		// http://stackoverflow.com/a/383245/229189
+		// add missing properties from obj2
+		function merge ( obj1, obj2 ) {
+			obj1 = getCopy( obj1 );
+			obj2 = getCopy( obj2 );
+
+			for ( var p in obj2 ) {
+				try {
+					// Property in destination object set; update its value.
+					if ( typeof obj2[p] === 'object' ) {
+						obj1[p] = merge( obj1[p], obj2[p] );
+					} else {
+						if ( typeof obj1[p] === 'undefined' && typeof obj2[p] !== 'undefined' ) {
+							obj1[p] = obj2[p];
+						}
+					}
+				} catch ( e ) {
+					obj1[p] = obj2[p];
+				}
+			}
+
+			return obj1;
+		}
+
 		return {
 			getObjectByString: getObjectByString,
-			getCopy: getCopy
+			getCopy: getCopy,
+			merge: merge,
+			isEqual: isEqual
 		};
 	}
 );