What is the _.flattenDeep() method in Lodash?

Overview

The _.flattenDeep() method in Lodash is used to recursively flatten an array, that is, to flatten all the nested arrays completely.

Syntax

Parameters

This method accepts the following parameter:

• array: This is the array to be flattened.

Return value

This method returns a flattened array.

Example

Let’s look at an example of the _.flattenDeep() method in the code snippet below:

Code explanation

In the HTML tab:

• Line 5: We import the lodash script.

In the JavaScript tab:

• Line 2: We create an array and initialize it with a few values.

• Line 5: We use the _.flattenDeep() method to flatten the array.
• Line 8: We print the output to the console.

Output

We get an array in which all the values are recursively flattened.