Check if an array includes a value in Javascript
Jul 24, 2021
In this article, I am going to describe 4 methods
- Using The indexOf() method
- Check if array includes a value in Javascript
- Check for NaN
- Check for Undefined
Using The indexOf() method
Using `indexOf()`, we can determine if an element is present in an array or not. Similar to the `includes()` method the `indexOf()` method also works on arrays and, it takes one argument.
See the code below.
var students = [“john”, “jane”, “jim”];
console.log( students.indexOf(“jane”) > -1 );
// true
Even though the `indexOf()` method supports both old and new browsers, it has few drawbacks.
