How to sort a collection ?
In this article, we will learn how to sort the items in a collection. The sort() method is used for this purpose. A collection takes the input of an array containing numbers, strings, or objects.
Syntax:
collect(array).sort()
Parameters: It takes an array as a parameter that is converted into a collection and then it is sorted according to the values of its elements.
We can sort a collection by using the Collect.js methods in two ways, both methods are mentioned and described below:
- Collect.js all() Method
- Collect.js sortByDesc() Method
Collect.js all() Method
The all() method returns all the elements represented by a collection in an underlying array. The JavaScript array is first transformed into a collection and then the function is applied to the collection.
Syntax:
sorted_collection.all()
Example 1: Here collect = require(𠆌ollect.js’) is used to import the collect.js library into the file.
Javascript
const collect = require( 'collect.js' ); const arr = [8, 2, 14, 26, 21, 17, 19] const collection = collect(arr); const sorted = collection.sort(); console.log(sorted.all()); |
Output:
[2, 8, 14, 17, 19, 21, 26]
Example 2: We can also sort a collection in descending order using some algorithms. We can pass a callback function for this purpose.
Javascript
const collect = require( 'collect.js' ); const arr = [8, 2, 14, 26, 21, 17, 19] const collection = collect(arr); const descending_sort = collection.sort((a, b) => b - a); console.log(descending_sort.all()); |
Output:
[26, 21, 19, 17, 14, 8, 2]
JavaScript sortByDesc() Method
If elements are Objects, then we can sort using the sortByDesc() method that sorts a collection of elements in descending order using a key as the parameter.
Syntax:
collect(array).sortByDesc(key)
Parameters:
- array: It takes the array as input, which is to be converted to a collection
- key: It is the parameter according to which the elements are to be sorted in descending order
Example 1:
Javascript
const collect = require( 'collect.js' ); const arr = [ 'Science' , 'Welcome' , 'Computer' , 'w3wiki' ] const collection = collect(arr); const descending_sort = collection.sortByDesc(); console.log(descending_sort); |
Output:
Collection { items: [ 'Welcome', 'Science', 'w3wiki', 'Computer' ] }
Example 2: We can also pass an array of objects and use a property of objects as a key to sort the elements of the collection.
Javascript
const collect = require( 'collect.js' ); let Employee = [ { name: 'Shyam' , id: 21 }, { name: 'Aditya' , id: 48 }, { name: 'Chris' , id: 12 } ]; const collection = collect(Employee); const sort_id = collection.sortByDesc( 'id' ) console.log(sort_id); |
Output:
Collection {
items: [
{ name: 'Aditya', id: 48 },
{ name: 'Shyam', id: 21 },
{ name: 'Chris', id: 12 }
]
}
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