Question

76

How to make an iterator out of an ES6 class

rated 0 times [ 80] [ 4] / answers: 1 / hits: 32994 / 9 Years ago, thu, february 26, 2015, 12:00:00

How would I make an iterator out of an ES6 class in the same manner as JS1.7 SomeClass.prototype.__iterator__ = function() {...} syntax?

[EDIT 16:00]

The following works:

class SomeClass {

    constructor() {

    }



    *[Symbol.iterator]() {

        yield '1';

        yield '2';

    }



    //*generator() {

    //}



}



an_instance = new SomeClass();

for (let v of an_instance) {

    console.log(v);

}

WebStorm flags *[Symbol.iterator]() with a 'function name expected' warning directly following the asterix, but otherwise this compiles and runs fine with Traceur. (Note WebStorm does not generate any errors for *generator().)

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marint

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4 Years ago

answered 9 Years ago susanajamiep · Accepted Answer

Define a suitable iterator method. For example:

class C {

  constructor() { this.a = [] }

  add(x) { this.a.push(x) }

  [Symbol.iterator]() { return this.a.values() }

}

Edit: Sample use:

let c = new C

c.add(1); c.add(2)

for (let i of c) console.log(i)