# Iterating over an object with a for-in loop in JavaScript

The loop `for-in` is intended to iterate over objects. It has the following syntax:

`for (let variableForKey in object) { }`

In `variableForKey` the keys of the iterated object will fall sequentially. Let's try with some example. Suppose we have such an object:

`let obj = {a: 1, b: 2, c: 3};`

Let's use the loop `for-in` to derive the keys of this object:

`for (let key in obj) { console.log(key); // shows 'a', 'b', 'c' }`

Now let's get the elements:

`for (let key in obj) { console.log(obj[key]); // shows 1, 2, 3 }`

Print all the keys of the following object to the console:

`let obj = {x: 1, y: 2, z: 3};`

Print all the elements of the following object to the console:

`let obj = {x: 1, y: 2, z: 3};`
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