Collect.js countBy() Method

Collect.js contains() Method

Last Updated : 26 Nov, 2022

The contains() method is used to determines whether the collection contains a given item or not. If it contains the item then it returns true otherwise false. The JavaScript array is first transformed into a collection and then the function is applied to the collection.

Syntax:

collect(array).contains(item)

Parameters: This method accepts single parameter i.e. converted into the collection and then contains() function take an item to be searched.

Return Value: Returns a boolean value.

Below examples illustrate the contains() method in Collect.js:

Example 1: Here collect = require(‘collect.js’) is used to import the collect.js library into the file.

JavaScript

const collect = require('collect.js');  
    
let arr = [1, 2, 3];  
    
// Convert array into collection  
const collection = collect(arr);  

// item to searched
let item = 3;

let newObject = collection.contains(item);
    
console.log("Result : ", newObject);

Output:

Result :  true

Example 2:

JavaScript

const collect = require('collect.js');  
    
let arr = [1, 2, 3]  
    
// Convert array into collection  
const collection = collect(arr);  

// concat the array
let concatarr = collection.concat(['a', 'b', 'c']);

// concat the object
concatarr = concatarr.concat({ first : "GeeksforGeeks", 
        second : "Collect.js"});

// item to searched
let item = "GeeksforGeek";

let newObject = collection.contains(item);
    
console.log("Result : ", newObject);

Output:

Result : false

Reference: https://collect.js.org/api/contains.html

Collect.js countBy() Method

S

SHUBHAMSINGH10

Improve

Article Tags :

Similar Reads

Collect.js is the javascript library for collecting data from tree-based structures. This library is used on JavaScript Array and Objects. Collect.js TutorialWhy Collect.js? It is a fluent and convenient wrapper for working with arrays and objects. It provides us with different functions that help i

Collect.js Introduction

Collect.js is a JavaScript library for collecting data from tree-based structures. This library is used on JavaScript Array and Objects. Features: Some of the important features of Collect.js are: It is a fluent and convenient wrapper for working with arrays and objects.It provides us with different

Collect.js | all() Method

The all() method is used to return the underlying array or object represented by the collection. The JavaScript array is first transformed into a collection and then the function is applied to the collection. Syntax:Â collect(array).all() Parameters: The method does not accept any parameter. Return

Collect.js average() Method

The average() method is used to return the average of all the items in a collection. This method is an alias of avg() method. Syntax: collect(array).average() Parameters: The collect() method takes one argument that is converted into the collection and then average() function is applied on it, which

Collect.js | avg() Method

Collect.js is a fluent and convenient wrapper for working with arrays and objects. The JavaScript array is first transformed into a collection and then the function is applied to the collection. The avg() method returns the average of all the items in a collection. Installation: Collect.js can be in

Collect.js | collapse() Method

Collect.js is a fluent and convenient wrapper for working with arrays and objects. The JavaScript array is first transformed into a collection and then the function is applied to the collection. The collapse() method convert collection of arrays into a single flat array. Installation: Collect.js can

Collect.js | combine() Method

Collect.js is a fluent and convenient wrapper for working with arrays and objects. The JavaScript array is first transformed into a collection and then the function is applied to the collection.The combine() method combines two different arrays with keys-values.Â Installation:Â Â Collect.js can be in

Collect.js concat() Method

The concat() method is used to return the merged arrays or objects represented by the collection. The JavaScript array is first transformed into a collection and then the function is applied to the collection. Syntax: collect(array1).concat(array2) Parameters: The collect() method takes one argument

Collect.js contains() Method

The contains() method is used to determines whether the collection contains a given item or not. If it contains the item then it returns true otherwise false. The JavaScript array is first transformed into a collection and then the function is applied to the collection. Syntax: Â collect(array).cont

Collect.js countBy() Method

The countBy() method is used to count the occurrence of values in the collection. This method counts the occurrence of every element. Syntax: collect(array).countBy() Parameters: The collect() method takes one argument that is converted into the collection and then countBy() method is applied on it.