Lodash's `map()` Function

Lodash’s `map()` Function

Lodash’s `map()` Function

In this post, we will give you information about Lodash’s `map()` Function. Here we will give you detail about Lodash’s `map()` Function And how to use it also give you a demo for it if it is necessary.

Given an array arr and a function fn, Lodash’s map() function returns an array containing the return values of fn() on every element in the array.

const arr = [1, 2, 3, 4];

_.map(arr, v => v * 2); // [2, 4, 6, 8]

On Arrays of Objects for Lodash’s `map()` Function

Given an array of objects, you can pass a string as fn instead of a function to get array containing each object’s value for the property fn.

const arr = [
  { firstName: 'Will', lastName: 'Riker', rank: 'Commander' },
  { firstName: 'Beverly', lastName: 'Crusher', rank: 'Commander' },
  { firstName: 'Wesley', lastName: 'Crusher', rank: 'Ensign' }

_.map(arr, 'firstName'); // ['Will', 'Beverly', 'Wesley']
// Equivalent:
_.map(arr, v => v.firstName); // ['Will', 'Beverly', 'Wesley']

On Objects for Lodash’s `map()` Function

You can also call _.map() on an object. _.map(obj, fn) behaves like _.map(Object.values(obj), fn).

const obj = {
  one: 1,
  two: 2,
  three: 3,
  four: 4

_.map(obj, v => v * 2); // [2, 4, 6, 8]


See also  Find Objects by Nested Properties with Lodash

Lodash is a JavaScript library which provides utility functions for common programming tasks using the functional programming paradigm. Lodash is a JavaScript library that helps programmers write more concise and maintainable JavaScript. It can be broken down into several main areas: Utilities: for simplifying common programming tasks such as determining type as well as simplifying math operations.

Why Lodash?

Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc.Lodash’s modular methods are great for:

  • Iterating arrays, objects, & strings
  • Manipulating & testing values
  • Creating composite functions

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See also  Lodash's `merge()` Function

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