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).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(âcollect.jsâ) is used to import the collect.js library into the file.
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:
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);
