jQuery.mergeObjects()

jquery-merge-objects

(function($) {
    $.mergeObjects = function(objects, merge_cb) {
		var options, name, src, copy, copyIsArray, clone,
			target = objects[0] || {},
			i = 1,
			length = objects.length;

		// Handle case when target is a string or something 
		if ( typeof target !== "object" && !$.isFunction(target) ) {
			target = {};
		}

		// Extend jQuery itself if only one argument is passed
		if ( i === length ) {
			target = this;
			i--;
		}

		for ( ; i < length; i++ ) {
			// Only deal with non-null/undefined values
			if ( (options = objects[ i ]) != null ) {
				// Extend the base object
				for ( name in options ) {
					src = target[ name ];
					copy = options[ name ];

					// Prevent never-ending loop
					if ( target === copy ) {
						continue;
					}

					// Recurse if we're merging plain objects or arrays
					if ( copy && ( $.isPlainObject(copy) ||
						(copyIsArray = $.isArray(copy)) ) ) {

						if ( copyIsArray ) {
							copyIsArray = false;
							clone = src && $.isArray(src) ? src : [];

						} else {
							clone = src && $.isPlainObject(src) ? src : {};
						}

						// Never move original objects, clone them
						target[ name ] = $.mergeObjects( [clone, copy], merge_cb);

					// Don't bring in undefined values
					} else if ( copy !== undefined ) {
						if ($.isFunction(merge_cb)){
							if(merge_cb(target[ name ], copy) !== undefined ){
								target[ name ] = merge_cb(target[ name ], copy)
							}
						} else {
							target[ name ] =  copy;
						}
					}
				}
			}
		}

		// Return the modified object
		return target;

    }

}(jQuery));