# Problem Solving - Array Flatten

In Javascript we know that we can nest arrays inside of other arrays. For example, the following is a valid array in JavaScript

```javascript
[1, 2, [3, 4], [5, 6], 7]
```

but you can imagine a case when you'd like to flatten an array, decompose it into just an array of elements, so...

```javascript
[1, 2, [3, 4], [5, 6], 7]
```

would become

```javascript
[1, 2, 3, 4, 5, 6, 7]
```

## Challenge 1

Create a JavaScript file called `flatten.js` and implement the function below that flattens an array. For now, don't worry about arrays that are more than one level deep.

```javascript
var flatten = function(arr){
    //flatten the array here

    return arr;
}

var myArr = [1, 2, [3, 4], [5, 6], 7];

console.log(flatten(myArr));
//output: [1, 2, 3, 4, 5, 6, 7]
```

**HINT:** There might be something useful [in here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array).

## Challenge 2

As we know, arrays in JavaScript can be nested as deeply as we want. So the input could be...

```javascript
[1, 2, [3, 4], [5, [6]], 7]
```

or even something like...

```javascript
[1, [2, [3, [4, [5]]], 6, [7]]]
```

Therefore, our function needs to be able to handle an array of any depth. Create a new function called `flatten2` that flattens deeply nested arrays. So, both of the examples should be flattened to `[1, 2, 3, 4, 5, 6, 7]`.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://tmdarneille.gitbook.io/seirfx/08-cs/teaser-js-array-flatten.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.