Sam Ruby: Ruby2js += underscore.js

Sam Ruby: Ruby2js += underscore.js

Ruby2js += underscore.js Thu 23 Jan 2014 at 14:52 When compared to Ruby, JavaScript doesn’t have as much functional support built in. Underscore.js fills that gap for many. Underscore.js, in turn, was inspired by Ruby’s Enumerable module. A underscore filter (tests ) completes the mapping. In many cases, the resulting JavaScript is formed by applying a number of filter rules. For example, starting with: a.flatten!() This is first expanded to use Array.prototype.slice to ensure the update happens in place: a.splice(0, a.length, *a.flatten()) Next, the method call is rewritten to use the underscore flatten function : a.splice(0, a.length, *_.flatten(a)) Finally, as JavaScript doesn’t have a splat operator, the call is rewritten using Function.prototype.apply : a.splice.apply(a, [0, a.length].concat(_.flatten(a))) Tim Bray will be pleased to hear that Ruby2js currently maps a...

Full article: http://www.intertwingly.net/blog/2014/01/23/Ruby2js-under...