4 ms·

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

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 1y ago
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 https://wren.io/performance.html#copy-down-inheritance
- reactordev 1y ago
  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 1y ago
    Yes: https://wren.io/try/?code=MYGwhgzhAECC0G8BQ1rAPYDsIBcBOArsDtJgKYDu0AFAJSIC+K0OAFgJaYDm16ARgCt6yVKgDKAT1xkAtgDoADnk45eg2syZMkoSDABC0djHgi0WXIWKlKNYVqRJ9c8hTpy2nHgEZaQA https://wren.io/try/?code=MYGwhgzhAECC0G8BQ1rAPYDsIBcBOArsDt...
    - reactordev 1y ago
      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 1y ago
        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 https://wren.io/functions.html#returning-values
        reactordev 1y ago
        That was it. Nuance in the “no new line after…” parsing. Thanks, it works now. Awesome!

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 1y ago

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

reactordev 1y ago
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 1y ago
  Yes: https://wren.io/try/?code=MYGwhgzhAECC0G8BQ1rAPYDsIBcBOArsDtJgKYDu0AFAJSIC+K0OAFgJaYDm16ARgCt6yVKgDKAT1xkAtgDoADnk45eg2syZMkoSDABC0djHgi0WXIWKlKNYVqRJ9c8hTpy2nHgEZaQA https://wren.io/try/?code=MYGwhgzhAECC0G8BQ1rAPYDsIBcBOArsDt...
  - reactordev 1y ago
    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 1y ago
      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 https://wren.io/functions.html#returning-values
      - reactordev 1y ago
        That was it. Nuance in the “no new line after…” parsing. Thanks, it works now. Awesome!