console.log() with message history

console.loghistory.js

console.log = (function (oldlog) {

	var console_log = oldlog.bind(console);

	var messages = [];

	var newlog = function (msg) {
		messages.push(msg);
		console_log(msg);
	};
	
	newlog.read = function () { return messages.slice(); };
	newlog.clear = function () { messages.length = 0; };
	newlog.lines = function (delim) {
		delim = typeof delim !== 'undefined' ? delim : "\n";
		return messages.join(delim);
		};
	newlog.detach = function () { console.log = oldlog; };

	return newlog;
})(console.log);

//todo: manager object allowing attach/detach without re-evaluating the closure.