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Collect.js contains() Method

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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



Last Updated : 26 Nov, 2022
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