Object/Class/Interface destructuring

[enhancement]

Currently, it seems that destructuring is not supported. It is one of my most used TS features, and I'd like to see it in AssemblyScript.

There are many subtleties to destructuring, but the original TS repo has a well-documented history of changes:

microsoft/TypeScript#1346
microsoft/TypeScript#1463

We would ideally support

var [x, y] = [10, 20];
[x, y] = [y, x];

// and 

interface Foo { bar: f32, baz: f32 };
const { bar } = Foo;

// and

class Foo { bar: f32 = 10.0 };
const { bar } = new Foo();

@dcodeIO

@dcodeIO I know in general case it required iterators, but most of time it will be optimized to simple stuffs. For example:

const arr = [1, 2, 3, 4];
const [a, b] = arr;
const [first, second, ...tail] = arr;

desugared to:

var arr = [1, 2, 3, 4];
var a = arr[0], b = arr[1];
var first = arr[0], second = arr[1], tail = arr.slice(2);

playground

And I guess it already could be implemented with some limitations

@MaxGraey

@MaxGraey That’s only if you don’t enable the downlevelIteration option.

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Object/Class/Interface destructuring #1473

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Object/Class/Interface destructuring #1473

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MaxGraey commented on Sep 25, 2020

ExE-Boss commented on Mar 31, 2021

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