在JavaScript中通过Generator创建数组

Question

I want to create an array from the values of an generator in JavaScript. The generator creates a sequence of dynamic length like this

function* sequenceGenerator(minVal, maxVal) {
    let currVal = minVal;

    while(currVal < maxVal)
        yield currVal++;
}

I want to store those values in an array but using next() until the generator is done does not seem to be the best way possible (and looks quite ugly to be honest).

var it, curr, arr;

it = sequenceGenerator(100, 1000);
curr = it.next();
arr = [];

while(! curr.done){
    arr.push(curr.value);
}

Can I somehow create an array directly from/within the generator? If not, can I somehow avoid/hide the loop? Maybe by using map or something like that?

Thanks in advance.

Answer 1

One short solution might be:

let list = [...sequenceGenerator(min, max)]

Documentation on MDN

Answer 2

I found another way

var arr = Array.from( sequenceGenerator(min, max) );

works aswell.

Answer 3

You can do it like this;

 function* sequenceGenerator() { let currVal = this.minVal; while(currVal <= this.maxVal) yield currVal++; } var obj = {minVal: 10, maxVal:20}, arr; obj[Symbol.iterator] = sequenceGenerator; arr = [...obj]; console.log(arr); 

Answer 4

Although you asked a very specific question, I am wondering if you are trying to solve a more general problem, ie keeping generator results around in a convenient manner. If go, you might try looking at https://github.com/anywhichway/generx . This will actually let you treat the generator like it is an array, ie access it using array notation after it has run.