![]() ![]() You can also use the lastIndexOf() method in the same way as the indexOf() method to check if an array contains a primitive value. ![]() You can use this with the strict inequality operator ( !=) to return true if the value is in the array, or false if it’s not. If the value is not in the array, it returns -1. This method returns the index position of the value in the array. However, these methods are quite limited because they return the index. Apart from loops, you can use includes (), indexOf (), find (), etc. In ES5, to find an element in an array, you use the indexOf() or lastIndexOf() methods. ![]() You can also use the indexOf() method to determine if an array contains a primitive value: console.log(.indexOf("Matilda") != -1) // true In JavaScript, there are multiple ways to check if an array includes an item. There’s also an optional second argument called fromIndex, which is the index at which to start searching in the array. The method returns true if the searchElement is found and false if it’s not found. You can have arrays in an Array: myArray 0 Date. This is the value that the method searches for in the array. The find () method returns the first element in the given array that satisfies the provided testing function. The first argument of the includes() method is the searchElement. You can simply use the find () method to find an object by a property value in an array of objects in JavaScript. Using the includes() method is the most readable method to check if an array contains a primitive value: console.log(.includes("Matilda")) // true There are seven primitive data types: string, number, bigint, boolean, undefined, symbol, and null. Checking if an Array Contains a Primitive ValueĪ primitive value is a value that’s not an object. If you are checking if an array contains a primitive value, such as a string or number, the solution is more straightforward than if you are checking for a value that’s an object. ![]() There are two JavaScript array methods that are commonly used to find a value in an array: includes() and indexOf(). You want to check if an array contains a particular value. ![]()
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