Assemblyscript: Object literals

[trusktr]

Are those (or will those) be supported?

I didn't have any luck trying to make an object literal, so I'm using Map. I didn't see any mention of object literals in the new docs.

[dcodeIO]

There is a mention at https://docs.assemblyscript.org/basics#strict-typing

Objects must be strictly typed as well:

// 😢
var a = {};
a.prop = "hello world";

// 😊
var a = new Map<string,string>();
a.set("prop", "hello world");

// 😏
class A {
  constructor(public prop: string) {}
}
var a = new A("hello. world");

What this doesn't mention is that there is some support currently, for example {} can be used to initialize an instance of a class in a matching type context, if the constructor has zero arguments. But that's not great yet, so not mentioned.

[trusktr]

Ah cool. Thanks. I'm trying to use Map to convert some JS object-literal code over, and the JS code that does something like

        if (listeners[eventName] === undefined) {
            listeners[eventName] = []
        }

So I'm wondering what to do. In the docs:

a get with a key that does not exist results in an error, because undefined cannot be represented.

So a get will crash the program.

I guess I need to go through the code base, and make a list of all possible string keys, and initialize them all?

[trusktr]

Hmmm, maybe I need to use an array of array tuples, and findIndex?

[trusktr]

Oh, but I don't think Array can support multiple item types?

[trusktr]

Oh, duh, Map#has. nvm

[lastmjs]

I would love to see object literal support. Is that something that will be possible in the future? If so, can we reopen this?

[MaxGraey]

We have some plans. See this for example: #338 and #299. But even now you could do something like this:
https://github.com/ycw/Babylon.Font/blob/master/src_wasm/assembly/index.ts#L477
https://github.com/ycw/Babylon.Font/blob/master/src_wasm/assembly/index.ts#L568