Skip to content
Related Articles

Related Articles

Improve Article

Lodash _.flatten() Method

  • Last Updated : 29 Jul, 2020
Geek Week

Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers etc.
The Lodash.flatten() method is used to flatten the array to one level deep.

Syntax:

flatten( array )

Parameter: This method accepts single parameter array that holds simple array or array of arrays.

Return Value: The return type of this function is array.

Note: Please install lodash module by using command npm install lodash before using the code given below.



Example 1: When 2D array of Integers is given.

Javascript




// Requiring the lodash library
const _ = require("lodash");
  
// Original array
let array1 = [[1, 2], [4, 5], [7, 8]]
  
// Using _.flatten() method
let newArray = _.flatten(array1);
  
// Printing original Array
console.log("original Array1: ", array1)
  
// Printing the newArray
console.log("new Array: ", newArray)

Output:

Example 2: When array of arrays of object is given.

Javascript




// Requiring the lodash library
const _ = require("lodash");
  
// Original array
let array1 = [[{ "a": 1 }], 
    [{ "b": 2 }, { "c": 3 }]]
  
// using _.flatten() method
let newArray = _.flatten(array1);
  
// printing original Array
console.log("original Array1: ", array1)
  
// printing the newArray
console.log("new Array: ", newArray)

Output: 

Example 3: When empty array of arrays is given.

Javascript




// Requiring the lodash library
const _ = require("lodash");
  
// Original array
let array1 = [[], [[[]]], [[]], []]
  
// Using _.flatten() method
let newArray = lodash.flatten(array1);
  
// Printing original Array
console.log("original Array1: ", array1)
  
// Printing the newArray
console.log("new Array: ", newArray)

Output:

Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!




My Personal Notes arrow_drop_up
Recommended Articles
Page :