# Overview

The **`indexOf`** function in Javascript is used to find the index of a particular key in the array. The general syntax for `indexOf` is:

```Javascript
array.indexOf(keyName);
``` 

# Parameters

The function `indexOf` takes one single mandatory input as an argument. The mandatory input is the name of the key we want the index of. 

# Return value

The function `indexOf` returns the index of the key.

# Example

The following example will help you understand the function `indexOf` more clearly. First, we create an array of names. Then, we use the function `indexOf` to find the index of the name "Sana." Lastly, we print the index.

const names = ["Samia", "Sana", "Ali"];
const ind = names.indexOf("Sana");
console.log(ind);

What is array indexOf() in Javascript?

The `indexOf` function in Javascript returns the index of a specified key in an array using the syntax `array.indexOf(keyName)`.