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: