The includes() method checks if an array contains a specified element or not. let check2 = languages.includes("python"); // second argument specifies position to start the search This method tests whether at least one element in the array passes the test implemented by the provided function. For example: Here the includes() method returns true for searchValue- 'Python' and false for 'python'. let check1 = languages.includes("Java", 2); // the search starts from third last element Because Array.prototype.includes depends on a receiver (the this value), the main export takes the array to operate on as the first argument. let check1 = languages.includes("Python"); // checking whether the array contains 'python' Here, we will understand includes() method through various examples. // checking whether the array contains 'Java' This package implements the es-shim API interface. Please mail your requirement at [emailprotected] Duration: 1 week to 2 week. Developed by JavaTpoint. like, Likewise, two distinct arrays are not equal even if they have the same values in the same order. In languages.includes("Java", -3), the method starts searching 'Java' from the third last element because of the negative argument -3. In this tutorial, you will learn about the JavaScript Array include() method with the help of examples. Claim Discount. or share your feedback to help us improve. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. It returns true if an array contains the element, otherwise false. languages.includes("Java", 2) returns false since the method doesn't find 'Java' from second index of the array. The includes() method can take two parameters: Note: For negative values, the search starts from array.length + fromIndex (Counting from backward). 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Ltd. All rights reserved. The includes() method is represented by the following syntax: start - It is optional. Let's see a simple example to determine whether the given array contains the specified element. Here's an example that demonstrates how it works: Note that if try to find the object inside an array using the indexOf() method like persons.indexOf({name: "Harry"}) it will not work (always return -1). The includes() method is case sensitive. The JavaScript array includes() method checks whether the given array contains the specified element. JavaTpoint offers too many high quality services. Because, two distinct objects are not equal even if they look the same (i.e. let check2 = languages.includes("Ruby"); // checking whether the array contains 'Python' It represents the index from where the method starts search. Try hands-on coding with Programiz PRO. let check1 = languages.includes("C"); // checking whether the array contains 'Ruby' In the above example, we have used the includes() method to check whether the languages array contains elements 'C' and 'Ruby'. Here are some more FAQ related to this topic: Is this website helpful to you? The some() method is supported in all major browsers, such as Chrome, Firefox, IE (9 and above), etc. You can use the JavaScript some() method to find out if a JavaScript array contains an object. See the tutorial on JavaScript ES6 Features to learn more about arrow function notation. All Rights Reserved. have the same properties and values). All rights reserved. This is because the method is case sensitive and it treats 'Python' and 'python' as two different strings. let check2 = languages.includes("Java", -3); Join our newsletter for the latest updates. languages.includes("C") returns true since the array contains 'C' and languages.includes("Ruby") returns false since the array does not contain 'Ruby'. Copyright 2022 Tutorial Republic. Copyright 2011-2021 Mail us on [emailprotected], to get more information about given services. An ES7/ES2016 spec-compliant Array.prototype.includes shim/polyfill/replacement that works as far down as ES3. Please give us a let check = languages.includes("Java"); // checking whether the array contains 'C' Basic usage: includes(array, value[, fromIndex=0]), Simply clone the repo, npm install, and run npm test, Recommended Reading: JavaScript Array indexOf(). Let's see one more example to determine whether the includes() method is case-sensitive. How to check if a value exists in an array in JavaScript, How to check if an object property is undefined in JavaScript, How to dynamically access object property using variable in JavaScript. Make your summer productive. We are having a 2 day sale on Programiz PRO. Parewa Labs Pvt. For example, -1 represents the last element. In this example, we will provide the index from where the search starts. In the above example, we have passed two argument values in the include() method. It works in an ES3-supported environment and complies with the proposed spec. Connect with us on Facebook and Twitter for the latest updates.