merge from highcharts

gistfile1.txt

function merge() {
	var i,
		args = arguments,
		len,
		ret = {},
		doCopy = function (copy, original) {
			var value, key;

			// An object is replacing a primitive
			if (typeof copy !== 'object') {
				copy = {};
			}

			for (key in original) {
				if (original.hasOwnProperty(key)) {
					value = original[key];

					// Copy the contents of objects, but not arrays or DOM nodes
					if (value && typeof value === 'object' && Object.prototype.toString.call(value) !== '[object Array]' &&
							key !== 'renderTo' && typeof value.nodeType !== 'number') {
						copy[key] = doCopy(copy[key] || {}, value);
				
					// Primitives and arrays are copied over directly
					} else {
						copy[key] = original[key];
					}
				}
			}
			return copy;
		};

	// If first argument is true, copy into the existing object. Used in setOptions.
	if (args[0] === true) {
		ret = args[1];
		args = Array.prototype.slice.call(args, 2);
	}

	// For each argument, extend the return
	len = args.length;
	for (i = 0; i < len; i++) {
		ret = doCopy(ret, args[i]);
	}

	return ret;
}