Apart from loops, you can use includes (), indexOf (), find (), etc. In other words, you’ll either get a true or a false. In JavaScript, there are multiple ways to check if an array includes an item. This method will return a boolean value indicating whether an array includes a certain item. The easiest, most straightforward way to check if an array contains a value is to use the includes() method. Now let’s dive deeper into each of these methods, with code snippets, to understand how they work and what you need to to make use of them. When you need to know if any value in the array satisfies a specific condition. Returns a boolean indicating whether at least one item in the array passes the test implemented by the provided function. When you need to find the index of a value based on a specific condition. Returns the index of the first item in the array that satisfies the provided testing function, or -1 if no elements pass the test. When you need to know both the presence and the index of the first occurrence of a value in the array. Returns the first index at which a given item can be found in the array, or -1 if it’s not present. Simple and straightforward use case, when you just need to know if a value is present in the array or not. Returns a boolean indicating whether an array includes an item. Generally, you can use the includes() and some() methods, which will return boolean values, or indexOf() and findIndex(), which will return the index of the first occurence of the value found. There’s more than one way to check if an array contains a value in JavaScript. This weeds out values like null, undefined and anything else that is not an array. So let’s not waste any time and help you find out. Array.isArray (), unsurprisingly, checks whether its argument is an array. Since you’re here, I take it you want to learn to check if an array-type object contains a given value. These two things verify that the array exists. The array is also checked if it is ‘null’. The more you learn about JavaScript, the more you realize you need to learn. The array can be checked if it exists by checking if the type of the array is ‘undefined’ with the typeof operator.
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