How to check if an array includes an object in JavaScript ?
Last Updated :
03 May, 2024
In JavaScript, an array acts like like list. It’s a way to group multiple items together under one name. You can store different things in your list, like numbers, words, or even other lists. Each item in the list has its own place, and you can access it using a number called its “index.”
We will check if an array includes an object or not in JavaScript. There are various methods to check whether an array includes an object or not.
How to check if an array includes an object in JavaScript ?
These are the following approaches by using these we can check if an array includes an object in JavaScript:
1. Using includes() Method
If the array contains an object/element can be determined by using the includes() method. This method returns true if the array contains the object/element else return false.
Syntax:Â
array.includes( element/object, startingPosition )
Example: This example shows the use of the above-explained approach.
Javascript
let obj = { "geeks1": 10, "geeks2": 12 }
let gfg = ["geeks1", "geeks2", obj];
// Use JavaScript includes() method
let num = gfg.includes(obj, 0);
console.log(num)
2. Using some() Method
The some() method uses the function for its evaluation and it executes the function once for each element present in the array. If it finds the object/element in the array then it returns true and stops the execution for the remaining elements otherwise returns false.
Syntax:Â Â
array.some( function(currValue, arrIndex, arrObj), this )
Example:Â This example shows the use of the above-explained approach.
Javascript
let arr = ["geeks1", "geeks2", "geeks3",
{ 1: "geeks4", 2: "geeks5" }];
let boolVar = arr.some(
value => { return typeof value == "object" });
console.log(boolVar);
3. Using filter() Method
The filter() method creates the array of all those elements/objects that pass the checking condition.
Syntax:Â
array.filter( function(currValue, arrIndex, arrObj), this )
Example: This example shows the use of the above-explained approach.
Javascript
let obj = { "geeks1": 10, "geeks2": 12 }
let arr = ["geeks1", "geeks2", "geeks3", obj];
if (arr.filter(value => value == obj).length > 0)
console.log("true");
else
console.log("false");
4. Using findIndex() Method
The findIndex() method returns the position of searched object/element if it is present in the array and stops the execution for the rest elements. If the element/object is not found then return -1.
Syntax:Â
array.findIndex( function(currValue, arrIndex, arrObj), this )
Example: This example shows the use if the above-explained approach.
Javascript
let arr = ["geeks1", "geeks2", "geeks3",
{ "geeks1": 10, "geeks2": 12 }];
let num = arr.findIndex(
value => { return typeof value == "object" });
console.log("Object found at position: " + num);
OutputObject found at position: 3
5. Using Lodash _.find() Method
we are using _.find() method which helps us to find out that the given value is present in the array or not. and lodash is third party and javascript library.
Syntax:
_.find(collection, predicate, [fromIndex=0])
Example: This example shows the use if the above-explained approach.
Javascript
// Requiring the lodash library
const _ = require("lodash");
// Collection of string
let arr = ["geeks1", "geeks2", "geeks3",
{ "geeks1": 10, "geeks2": 12 }];
let obj = { "geeks1": 10, "geeks2": 12 }
// Check value is found
// or not by _.includes() method
console.log(_.find(arr, obj));
Output:
{ "geeks1": 10, "geeks2": 12 }
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