Is it possible to use ES6 For..Of on an Object instead of an Array?

Question

On babel-node REPL I get

TypeError: undefined is not a function

when trying to iterate using a For..Of on an object. I don't get why a for..in would work, but a for..of won't. Is it only for Arrays?

const config = { base: 'iei', url: 'www.' }

for (let i of config) { console.log(i); }

yeah looks like the same thing.. mine has a more explicit title though. — cuadraman, Jul 24 '15 at 00:20

Bergi · Accepted Answer · 2015-07-24T00:15:28.573

3

No, for of is for iterables. Not all objects are iterable. You can create a custom iterator for your object, though:

Object.values = function* (o) {
    for (let k of Object.keys(o))
        yield o[k];
};

for (let i of Object.values(config)) console.log(i); // 'iei', 'www.'

edited Jul 24 '15 at 00:15

answered Jul 23 '15 at 22:41

Bergi

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Is it possible to use ES6 For..Of on an Object instead of an Array?

1 Answers1