Attempting to write a recursive async generator function, I hit a roadblock when I realized I am unsure of the syntax for yield* in the context of an async generator.
In a conventional generator function, I can utilize yield* to yield all values from another generator:
function* A() {
yield 1;
yield 2;
yield 3;
}
function* B() {
yield* A();
yield* A();
}
[...B()] // === [1,2,3,1,2,3]
However, when dealing with an async generator, how exactly can I yield all values?
Perhaps a question that may seem trivial at first (even though MDN does not provide explicit details, but the specification does).
I experimented with it and found that yield* functions well in both synchronous and asynchronous generators:
async function* A() {
await new Promise(r => setTimeout(r, 1000));
yield 1;
yield 2;
yield 3;
}
async function* B() {
// works perfectly
yield* A();
yield* A();
}
await (async() => {
let arr = [];
for await (let n of B()) {
arr.push(n);
}
return arr;
})(); // Promise -> [1,2,3,1,2,3]
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