Node.js lodash.sortBy() Function

In this article, you will learn about the Node.js lodash.sortBy() function with its syntax, parameters, and examples.

What is Node.js lodash.sortBy() function?

Underscore.js may be extended with the use of Lodash, a well-liked Node.js utility library. The range of functions it provides makes working with arrays, strings, objects, numbers, and other data types easier. The method _.sortBy() is one of its useful methods. It sorts an array according to predetermined criteria in ascending order. With the ability to provide one or more iterates to sort the elements, this method can handle complicated sorting requirements.

Syntax:

It has the following syntax:

Parameters:

• Collection: The group of elements that has to be organized.
• [iteratees=[_.identity]]: An optional parameter that indicates the standards by which the sorting will be done. It may require strings that indicate the names of properties or an array of functions. The elements are sorted according to their natural order if the identity function (_.identity) is not provided.

Return Value:

The sorted collection is returned.

Example 1:

lLet us take an example to illustrate the Node.js lodash.sortBy() function.

Output:

 
 Before sorting, the elements are: [ 3, 2, 7, 6, 4, 8 ]
After sorting, the elements are: [ 2, 3, 4, 6, 7, 8 ]  

Explanation:

In this example, the Lodash library is imported using the variable "l" in this bit of Node.js code, which also generates an array with numeric elements [3, 2, 7, 6, 4, 8]. After that, the console.log() is used to log the array to the console to display the unsorted array in its initial state. Next, the elements of the array are sorted in ascending order using Lodash's _.sortBy() function. The natural order of the elements is used for sorting because no iterate is supplied. The elements are displayed in ascending order in the sorted array, which is logged into the console. In order to improve code readability and maintainability, this code demonstrates how Lodash makes sorting operations in JavaScript easier. It offers a practical method for sorting arrays with minimal effort.

Example 2:

Let us take another example to illustrate the Node.js lodash.sortBy() function.

Output:

 
 Before sorting, the elements are: 
4,8,2,z,a,g,28
After sorting, the elements are: 
2,4,8,28,a,g,z  

Explanation:

Using the variable "l", the Lodash library is imported in this snippet of Node.js code. An array a is constructed, which contains a combination of string and numeric elements [4, 8, 2, "z", "a", "g", "28"]. Using the console.log() method, the initial state of the array is logged to the console along with a newline character for improved formatting. After that, the elements of the array are sorted using Lodash's _.sortBy() method. However, because the elements are mixed types, Lodash sorts them according to their natural order, which might not arrange non-numeric values in the way that is intended. After sorting, the array is recorded to the console with the elements shown, once again formatted with a newline character.

Example 3:

Let us take another example to illustrate the Node.js lodash.sortBy() function.

Output:

 
 [
  { name: 'John', age: 30 },
  { name: 'Joseph', age: 35 },

  { name: 'Peter', age: 25 }
]
[
  { name: 'Peter', age: 25 },
  { name: 'John', age: 30 },
  { name: 'Joseph', age: 35 }
]  

Explanation:

The Lodash library, imported as _, is used in this Node.js code to sort an array of elements. Each object in the elements array represents a user and has properties for name and age. The "_.sortBy() function" is used to demonstrate two different sorting processes. The elements array is sorted using the name property of each object, and the result is stored in the sortingByName variable in the first operation. By using their names, the users are sorted alphabetically. Similar to the first operation, the second one sorts names in ascending order according to their ages by sorting the elements array by the age property, which is stored in the sortingByAge variable. In order to display the sorted user lists, both sorted arrays are finally recorded in the console.

This code demonstrates how Lodash makes sorting easier by making it simple for developers to provide sorting criteria, which improves the code's readability and maintainability.