Open In App

Lodash _.flattenDeep() and _.flattenDepth() Method

Improve
Improve
Like Article
Like
Save
Share
Report

Lodash _.flattenDeep() Method

The _.flattenDeep() method is used to completely flatten nested arrays. It does this recursively.

Syntax:

_.flattenDeep( array )

Parameters: This method accepts single parameter as mentioned above and described below:

  • array: This parameter holds the array that to be flatten.

Return Value: This method returns the new flattened array.

Example:




const _ = require('lodash');
  
let ar = [1, [2, [3, 4, [5]]]];
  
let flattenArray = _.flattenDeep(ar);
  
console.log(flattenArray);


Here, const _ = require('lodash') is used to import the lodash library into the file.

Output:

[ 1, 2, 3, 4, 5 ]

Lodash _.flattenDepth() Method

The _.flattenDepth() method is used to flatten up to depth time that is passed into the function.

Syntax:

_.flattenDepth(array, depth)

Parameters: This method accepts two parameters as mentioned above and described below:

  • array: This parameter holds the array that need to be flatten.
  • depth: This parameter holds the maximum recursion depth.

Return Value: This method returns the new flattened array.

Example 1: Flatten to depth 1




const _ = require('lodash');
  
let ar = [1, [2, [3, 4, [5]]]];
  
let flattenArray = _.flattenDepth(ar, 1);
  
console.log(flattenArray);


Output:

[ 1, 2, [ 3, 4, [ 5 ] ] ]

Example 2: Flatten to depth 2




const _ = require('lodash');
  
let ar = [1, [2, [3, 4, [5]]]];
  
let flattenArray = _.flattenDepth(ar, 2);
  
console.log(flattenArray);


Output:

[ 1, 2, 3, 4, [ 5 ] ]

Note: This will not work in normal JavaScript because it requires the library lodash to be installed.

Reference:



Last Updated : 24 Jul, 2023
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads