javascript-lodashHow do I flatten a nested array using Lodash in JavaScript?

Using Lodash, you can flatten a nested array in JavaScript with the _.flatten() method.

Example

let array = [1, [2, [3, [4]], 5]];
let flattenedArray = _.flatten(array);

console.log(flattenedArray);

Output example

[1, 2, 3, 4, 5]

The _.flatten() method takes a nested array as an argument and returns a flattened array. In the example above, the nested array [1, [2, [3, [4]], 5] is flattened into a single-level array [1, 2, 3, 4, 5].

The _.flatten() method also takes an optional argument of depth which specifies how deep the flattening should be. If depth is not specified, the array will be flattened to a single level.

The _.flatten() method is part of the Lodash library and can be imported into your project using import _ from 'lodash' or const _ = require('lodash').

Helpful links

• Lodash Documentation for _.flatten()
• MDN Documentation for import
• MDN Documentation for require

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