Javascript: How to access the current index value inside an array stored function

Unless you know in advance which specific properties will be used, you'll need a Proxy.

const prox = new Proxy(
  {},
  {
    get(_, prop) {
      return () => prop;
    }
  }
);

console.log(prox[123]());
console.log(prox.hello());    
console.log(prox['world']());

Since you have some non-numeric properties, you shouldn't use an array.

Javascript: How to access the current index value inside an array stored function

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