Can Opal classes be extended from javascript ?

[msree...@gmail.com]

Any pointers on calling opal code from js is much appreciated.

Currently I use coffeescript and it suffers from the same problem, but

it's possible.

[Elia Schito]

It's certainly possible. If you have a specific example I'll show you the correct code. Also you can give a look at this page http://opalrb.org/docs/generated_javascript/

Elia

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[Sreeharsha Mudivarti]

On Sat, Jul 12, 2014 at 6:28 PM, Elia Schito <el...@schito.me> wrote:

http://opalrb.org/docs/generated_javascript/

Not explicit mention of classes.

For an example, you can have a look at -- http://coffeescript.org/#classes

To make js compatible coffeescript, I had to https://github.com/harsha-mudi/yx

I even added a rudimentary mixin support. Instead of doing all that,

I could use ruby, no ?

[Elia Schito]

Opal classes are real instances of the class Class (as in Ruby)

If you want to create an opal class from JS I think this code should work

%x[

// class construction &block

Opal.Class.$new._p = function(){

  Opal.defn(this, '$initialize', function(a,b){

    this.$puts(a,b);

  })

  

  Opal.defn(this, '$greet', function(){

    this.$puts("hello");

  })

}; A = Opal.Class.$new()

// the Ruby way

A.$new(1,2)

// using the constructor

a = new A._alloc

a.$initialize(3,4)

]

A = `A`

A.new 5,6

Hope this is what you were looking for :)

Elia

☁ @elia ✎ el...@schito.me

☎ (+39) 348/9051393

[Sreeharsha Mudivarti]

Fascinating.

An example of extends, mixins, pretty please :)

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[Elia Schito]

Consider that include and extend are just methods, all the semantics are just part of their implementation.

To create a new module replace Class with Module in the previous code and you're ready to go.

Then supposing you created a module named B

A.$include(B);

Opal.Object.$new().$extend(B);

should both work correctly

Elia

☁ @elia ✎ el...@schito.me

☎ (+39) 348/9051393

[Sreeharsha Mudivarti]

Thx !

I'll look into this further.

btw there are some broken links in http://opalrb.org/docs/compiler/

[Elia Schito]

I'll fix the links, thanks for reporting, let me know if you find anything else we can fix or improve. 

Elia