我可以使用带有箭头 function 的生成器函数吗？

Question

I wander if it's possible to use arrow function with generators like this:

app.use( *() => {
    ...body of function
});

Thanks!

Answer 1

No, it's not possible to make it shorter than described in the documentation:

function* name([param[, param[, ... param]]]) {
   statements
}

Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*

Answer 2

You can, but not really in a nice way. It's not shorter and does not look that pretty. Check this out:

function* iterable(arg): Iterable<never> {
    yield* [];
}

async function* asyncIterable(arg): AsyncIterable<never> {
    yield* [];
}

const arrowIterable = arg => {
    return {
        *[Symbol.iterator]() {
            yield* [];
        },
    };
};

const arrowAsyncIterable = arg => {
    return {
        async *[Symbol.asyncIterator]() {
            yield* [];
        },
    };
};

This works because an iterable is basically an object with the Symbol.iterator or Symbol.asyncIterator set to an iterator. A generator is an iterator!

Enjoy!