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

Shubham Singh Kshatriya

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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Overview

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

Syntax

_.flattenDeep(array)

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:

Console
Implementation of the _.flattenDeep() method

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.

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lodash
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CONTRIBUTOR

Shubham Singh Kshatriya

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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