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In addition to @lichtjaeger 's anwer, you can go for for .. of, which is a new loop in ES6:

The for...of statement creates a loop iterating over iterable objects (including Array, Map, Set, String, TypedArray, arguments object and so on), invoking a custom iteration hook with statements to be executed for the value of each distinct property.

Difference between for...of and for...in

The for...in loop will iterate over all enumerable properties of an object.

The for...of syntax is specific to collections, rather than all objects. It will iterate in this manner over the elements of any collection that has a [Symbol.iterator] property.

The following example shows the difference between a for...of loop and a for...in loop.

Object.prototype.objCustom = function () {}; 
Array.prototype.arrCustom = function () {};

let iterable = [3, 5, 7];
iterable.foo = "hello";

for (let i in iterable) {
  console.log(i); // logs 0, 1, 2, "foo", "arrCustom", "objCustom"
}

for (let i of iterable) {
  console.log(i); // logs 3, 5, 7
}

(Source)

In ES2017:

const obj = { a: 1, b: 2 }

Object.entries(obj).map(([key, value]) => /* do what you want */)

ES2015:

const obj = { a: 1, b: 2 }

Object.keys(obj).map(key => {
    const value = obj[key]
    /* do what you want */
})

.map returns an Array. If you want an Object back, use .reduce and build the Object.