bound instance methods

[ZeeD]

I was working on my project and I found that the methods are not bound to the instances. This means that in a snippet like

class Cls
    sub method()
        print m
    end sub
end class

obj = new Cls()
obj.method()

f = obj.method
f()

m will be different between the calls obj.method() and f(), with a behavior similar to what happen with this in javascript.

While, in retrospective, it was obvious looking at how the .brs is compiled, I would suggest to add some explicit note on the classes documentation (maybe it's me, but I didn't find any reference about it, and naively I expected to work with a more common scope resolution).

BTW: is there a way to force the value of m? something like the js .bind() function

[TwitchBronBron]

Sure, we can add a note in the class documentation.

Unfortunately, the concept of .bind() doesn't exist in Roku development. Functions are just that. Functions. Any this binding happens by attaching the function to the object and then initiating the function using that dotted reference (i.e. obj.method()). As far as I'm aware, there's no way to fake this either.

[TwitchBronBron]

@ZeeD I just opened #682 to address your concerns. Could you give it a quick read and approve it if that properly addresses your concerns?

[ZeeD]

yeah, I feared that there was no .bind() - and the only obvious way to implement it is by relying on closure scope, witch is not a thing on brightscript

[TwitchBronBron]

Right. No closures either. :(