javascript - 是否可以将 ECMAScript 6 生成器重置为初始状态？

Question

鉴于提供的(非常简单的)生成器，是否可以将生成器返回到其原始状态以再次使用？

var generator = function*() {
    yield 1;
    yield 2;
    yield 3;
};

var iterable = generator();

for (let x of iterable) {
    console.log(x);
}

// At this point, iterable is consumed.
// Is there a method for moving iterable back
// to the start point by only without re-calling generator(),
// (or possibly by re-calling generator(), only by using prototype 
//  or constructor methods available within the iterable object)
// so the following code would work again?

for (let x of iterable) {
    console.log(x);
}

我希望能够将 iterable 传递给其他范围，对其进行迭代，做一些其他事情，然后能够稍后在同一范围内再次对其进行迭代。

Answer 1

如果你的意图是

to some other scope, iterate over it, do some other stuff, then be able to iterate over it again later on in that same scope.

那么你唯一不应该尝试做的就是传递迭代器，而是传递生成器:

var generator = function*() {
    yield 1;
    yield 2;
    yield 3;
};

var user = function(generator){

    for (let x of generator()) {
        console.log(x);
    }

    for (let x of generator()) {
        console.log(x);
    }
}

或者只是制作一个“循环”迭代器并在迭代时检查

var generator = function*() {
    while(true){
        yield 1;
        yield 2;
        yield 3;
    }
};

for( x in i ){
    console.log(x);
    if(x === 3){
        break;
    }
}