Some Underscore.js extensions

underscore.ext.js

/*
 * @author <a href="mailto:cedric at vidal dot biz">Cedric Vidal</a>
 */
_.mixin({

	and : function() {
		var funcs = arguments;
		return function() {
			var args = arguments;
			return _.all(_.map(funcs, function(f) {return f.apply(this, args);}), _.identity);
		};
	},

	array : function(object) {
		return _.isArray(object) ? object : [object];
	},

	// Asynchronous version of _.reduce
	// _.reduceAsync([1, 2, 3], function(memo, num, cb){ cb(memo + num); }, function(result) {console.log(result)}, 0);
	reduceAsync : function(obj, iterator, callback, memo, context) {
		if (obj == null) obj = [];
		var first = _.first(obj);
		if(first) {
			var rest = _.rest(obj);
			iterator.call(context, memo, first, function(memo) {
				_.reduceAsync(rest, iterator, callback, memo, context);
			}, 0, rest);
		} else {
			callback(memo);
		}
	},

});