Is it possible to compile ruby to js in a way that the ruby functions could be used from javascript?

[Emiliano Heyns]

In other words can I export functions/classes/objects and use them from javascript?

[Elia Schito]

Yes, you just need to be aware of the relation between Opal and JS.

At a basic level all Ruby constants are also stored under the Opal namespace, and all methods are stored as properties starting with a "$".

So if you want for example use an Hash from JS you can do the following:

var hash = Opal.Hash.$new()

hash['$[]=']('a', 1)

console.log(hash.$inspect()) // => "{:a => 1}"

Calling blocks is a bit more tricky, but can still be done from js:

var array = [1,2,3]

// _p stands for proc

array.$each_with_index._p = function(number, index){ console.log(number, index) }

array.$each_with_index.call(array)

Luckily there's also a helper for blocks:

Opal.block_send

var array = [1,2,3]

// _p stands for proc

Opal.block_send(array, 'each_with_index', function(number, index){ console.log(number, index) })

If you open a question on stackoverflow (tag #opalrb) I'll be happy to repost the answer there so that everyone can profit from it :)

Elia

☁ @elia ✎ el...@schito.me

☎ (+39) 348/9051393

On Tue, Jul 22, 2014 at 2:48 PM, Emiliano Heyns <emilian...@iris-advies.com> wrote:

In other words can I export functions/classes/objects and use them from javascript?

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