On: Wren: A classy little scripting language

[reactordev]

Static method inheritance is one thing. Member method inheritance (or lack there of) makes it long in the tooth to work with if you want to represent covariant classes that share methods.

[pansa2 → reactordev]

Wren does have instance method inheritance. It's implemented differently from most scripting languages, though. The implementation is more like a statically-typed language, for performance reasons:

https://wren.io/performance.html#copy-down-inheritance

[reactordev → pansa2]

So it does have:

    class A {
      construct new () {}
      thing(obj) {
         …
      }
    }

    class B is A {
       construct new () {}
    }

    B.new().thing(obj)

I’ll need to test this as this is what I want from my scripting language. If this works than wren will replace my Lua janky scripting.

[pansa2 → reactordev]

Yes:

https://wren.io/try/?code=MYGwhgzhAECC0G8BQ1rAPYDsIBcBOArsDt...

[reactordev → pansa2]

Trying to update a field from a subclass and print the results doesn’t work.

    class A {
      name {
        _name
      }
      name=(value){
        _name=value
      }
      construct new () {
        _name = "hello"
      }
      thing() {
        System.print(name)
      }
    }

    class B is A {
      construct new () {}
      update(name){
        super.name = name
        return this
      }
    }

    var b = B.new()
    b.update("world").thing()

If you change System.print(name) to System.print(_name) it works but it doesn’t when using the getter. You get null when System.print(name) is called.

Same if you use this.name

[pansa2 → reactordev]

Your `name` getter isn't working properly. Weirdly, Wren's implicit returns only work for functions written on a single line.

The getter either needs to be (exactly) `name { _name }` or it needs to explicitly `return _name`.

https://wren.io/functions.html#returning-values

[reactordev → pansa2]

That was it. Nuance in the “no new line after…” parsing. Thanks, it works now. Awesome!