Array contains javascript10/10/2023 So you may want to rewrite your code as follows: function contains(a, obj) )) //falseĬonsole.log(. If you need the best performance, benchmark for yourself in the relevant execution environments.Īs others have said, the iteration through the array is probably the best way, but it has been proven that a decreasing while loop is the fastest way to iterate in JavaScript. Array Contains a Primitive Value There are seven primitive values in JavaScript: string, number, boolean, undefined, null, bigint, and symbol. If the specified element is present in the array. The Array.filter method will return an array of all of the elements that satisfy the condition index. In the given code the contain method determines whether the specified element is present in the array or not. On each iteration, lowercase the array element and the string it should be compared to. If you need an easy solution, look for other answers. Use the Array.filter () method to iterate over the array. The includes () method is case sensitive. The includes () method returns false if the value is not found. It might not be relevant to modern JS execution contexts. The includes () method returns true if an array contains a specified value. The promised performance improvement was based on a benchmark done in browsers of that time. Update from 2019: This answer is from 2008 (11 years old!) and is not relevant for modern JS usage.
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