ballercat/walt

Nested structs and functions within structs

Open

#72 aperta il 28 gen 2018

Vedi su GitHub
 (7 commenti) (5 reazioni) (0 assegnatari)JavaScript (155 fork)batch import
enhancementhelp wantedmoderate

Metriche repository

Star
 (4637 star)
Metriche merge PR
 (Nessuna PR mergiata in 30 g)

Descrizione

Goal

Allow for nested structs and functions within structs.

Overview

Depends on (#28)

Closures are cool, but to be useful you'd want to return an object/struct with a closure or another struct as a field.

Basically, this syntax should be possible

type lambda Closure = () => i32;
type Struct = {
   increment: Closure,
   decrement: Closure
};
function getActions(): Struct {
  let x: i32 = 0;
  const result: Struct = 0;
  result = {
     increment: (): i32 => { 
        x += 1;
        return x;
     },
    decrement: (): i32 => {
        x -= 1;
        return x;
    },
    getX: (): i32 => { return x; }
  };
  return result;
}

export function test() : i32 {
  const actions: Struct = getActions();
  actions.increment();
  actions.increment();
  actions.decrement();
  // should be 1
  return actions.getX();
}

This should make the syntax much more expressive and allow for a wide range of applications.

Acceptance Criteria

  • Allow nested struct types within other structs
  • Allow closure types within structs
  • Test everything

Guida contributor