Javatpoint Logo
Javatpoint Logo

JavaScript Array findIndex() method

The JavaScript array findIndex() method returns the index of first element of the given array that satisfies the provided function condition. It returns -1, if no element satisfies the condition.


The findIndex() method is represented by the following syntax:


callback - It represents the function that executes each element.

value - The current element of an array.

index - It is optional. The index of current element.

arr - It is optional. The array on which findIndex() method operated.

thisArg - It is optional. The value to use as this while executing callback.


The index of first element of the array that satisfies the function condition.

JavaScript Array findIndex() method example

Let's see some examples of findIndex() method.

Example 1

Let's see a simple example of findIndex() method.

Test it Now



Example 2

In this example, we will find the index of prime number using findIndex() method.

Test it Now



Next TopicJavaScript Array

Youtube For Videos Join Our Youtube Channel: Join Now


Help Others, Please Share

facebook twitter pinterest

Learn Latest Tutorials


Trending Technologies

B.Tech / MCA