That means that you can detect if the array includes a NaN. Unlike array indexOf(), which uses Strict Equality Comparison, it includes comparisons using the SameValueZero equality algorithm. The JavaScript array is first transformed into a collection and then the function is applied to the collection. If it contains the item then it returns true otherwise false. Instead, it returns the first index of the element found in the array or will return -1 (which represents that the element is not found). The contains () method is used to determines whether the collection contains a given item or not. indexOf() to determine whether the element is present in the array. If the specified element is present in the array. It returns the boolean value: true or false. In the given code the contain method determines whether the specified element is present in the array or not. The includes() method determines whether the element is included in the array. The Array.includes() method was introduced in ECMAScript 6. Difference between Array.includes() and Array.indexOf()
This method tests whether at least one element in the array. If the start position is negative, the computed index is calculated as a position in an array to search for the element.Īn entire array will be searched if the computed index is less or equal to -1 * array.length. You can use the JavaScript some() method to find out if a JavaScript array contains an object. Therefore, the array will not be searched. The output of the above code is the following.įalse is returned if the start position is greater than or equal to the array’s length. Console.log(.includes(3, 2)) console.log(.includes(19, 1)) console.log(.includes(46, -1)) console.log(.includes(NaN)) In JavaScript, there are several ways to check if an array contains an object with a certain property value.
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