Using Objects in For Of Loops

Question

Why isn\'t is possible to use objects in for of loops? Or is this a browser bug? This code doesn\'t work in Chrome 42, saying undefined is not a function:

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Answer 1

in ES6 you could go with generator:

var obj = {1: 'a', 2: 'b'};

function* entries(obj) {
  for (let key of Object.keys(obj)) {
    yield [key, obj[key]];
  }
}

let generator = entries(obj);

let step1 = generator.next();
let step2 = generator.next();
let step3 = generator.next();

console.log(JSON.stringify(step1)); // {"value":["1","a"],"done":false}
console.log(JSON.stringify(step2)); // {"value":["2","b"],"done":false}
console.log(JSON.stringify(step3)); // {"done":true}

Here is the jsfiddle. In the output you will get an object with the "value" and "done" keys. "Value" contains everything you want it to have and "done" is current state of the iteration in bool.