JavaScript Array includes () Method - W3Schools
Description The includes() method returns true if an array contains a specified value. The includes() method returns false if the value is not found. The includes() method is case sensitive.
How do I check if an array includes a value in JavaScript?
When you know you just pushed an array with a value, using lastIndexOf remains probably the best solution, but if you have to travel through big arrays and the result could be everywhere, this could …
Array.prototype.includes () - JavaScript | MDN
Jul 20, 2025 · The includes() method of Array instances determines whether an array includes a certain value among its entries, returning true or false as appropriate.
JavaScript - Find an Item in an Array - GeeksforGeeks
Jul 23, 2025 · The find () method returns the value of the first element in an array that satisfies a provided testing function, or undefined if no values satisfy the function.
JavaScript Array Contains: 6 Methods to Find a Value | Built In
Jun 12, 2025 · Finding a value in an array is useful for effective data analysis. Learn how to discover what a JavaScript Array contains using indexOf, includes, for loop, some methods and more.
How to Check if an Array Contains a Value in Javascript
Summary: in this tutorial, you’ll learn how to check if an array contains a value in JavaScript. A value in JavaScript can be primitive such as a number or string. Or it can be an object. This tutorial shows …
javascript - Check if an element is present in an array - Stack Overflow
In modern browsers which follow the ECMAScript 2016 (ES7) standard, you can use the function Array.prototype.includes, which makes it way more easier to check if an item is present in an array: …
JavaScript Arrays - W3Schools
However, what if you want to loop through the cars and find a specific one? And what if you had not 3 cars, but 300? The solution is an array! An array can hold many values under a single name, and …
Check if an Item is in an Array in JavaScript – JS Contains with Array ...
Jun 28, 2022 · It returns true if the item is found in the array/string and false if the item doesn't exist. In this article, you'll see how to use the includes() method in JavaScript to check if an item is in an …
JavaScript Program to Check if An Array Contains a Specified Value
In this article, you will learn how to check if an array contains a specified value in JavaScript. Explore several methods, including using the includes () method, the indexOf () method, and leveraging the …