Opal.rb anonymous function in native object

Question

Is it possible to somehow achieve methods/lambda assigned in Hash to compile to native functions in native object? for example let

x = {foo: "foo", bar: ->{"bar"}}

I need that x to be compiled like such native object:
pseudo

x.to_n 
=>
Object {foo: 'bar', bar: function(){return "bar";}}

OK THAT WORKS AS EXPECTED ALMOST

is there a way to transpile method to native function e.g.

def foo
 'bar'
end

apply something like

(??:foo??).to_n
=>
function(){return "bar";};

?

Answer 1

I'm guessing you want to pass a ruby method as a callback to a javascript function, you could try something like this:

   x = { bar: method(:foo).to_proc }
   x.to_n

But bear in mind that this might not work as intended for class methods ( the context might change on javascript)

Another option is just wrap that method call on a lambda

   x = { bar: ->{ foo } }
   x.to_n

This seems a safer approach on my experience

---

EDIT:

My first answer just referenced method(:foo), but when you call this you get a Method object which opal doesn't bridge properly to an anonymous function, so it would require you to use it like this on javascript:

  console.log(#{x.to_n}.bar.$call())

To have it work as a function you need it to be a proc, so the need to call to_proc, and again this will probably broke if its a instance method

  class Test
    def initialize
      @var = "baz"
    end
    def foo
      "bar #{@var}"
    end
  end

  t = Test.new
  x = { bar: t.method(:foo).to_proc }
  `console.log(#{x.to_n}.bar())` # bar undefined
  y = { bar: ->{ t.foo } }
  `console.log(#{y.to_n}.bar())` # bar baz