# Iterator function in JavaScript

All iterables have a special structure called iterator. An iterator is a function that allows you to iterate over an object.

Let's look at an array example:

`let arr = [1, 2, 3];`

The iterator function for any iterable object is stored with a key in the form of the well-known symbol `Symbol.iterator`:

`let func = arr[Symbol.iterator];`

We can make sure that the function is stored under this key (but its code will be hidden from us by the browser):

`console.log(func); // the function`

Check the different types of iterables you know to see if they contain the described function.

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