How to get the Index of Specified Element in an Array in JavaScript - Step by Step Examples

How to get the Index of Specified Element in an Array in JavaScript ?

To get the index of a specified element in an array in JavaScript, you can use methods like indexOf.

In this example,

We create an integer array named numbers with values 10, 20, 30, 40, 50.
We use the indexOf method to find the index of a specific element in the array.
The indexOf method returns the index of the first occurrence of the element, or -1 if the element is not found.

const numbers = [10, 20, 30, 40, 50];
const index = numbers.indexOf(30);
console.log(`Index of element 30 is: ${index}`);

Index of element 30 is: 2

In this example,

We create a string array named fruits with values 'apple', 'banana', 'cherry'.
We use the indexOf method to find the index of a specific element in the array.
The indexOf method returns the index of the first occurrence of the element, or -1 if the element is not found.

const fruits = ['apple', 'banana', 'cherry'];
const index = fruits.indexOf('banana');
console.log(`Index of 'banana' is: ${index}`);

Index of 'banana' is: 1

In this tutorial, we learned How to get the Index of Specified Element in an Array in JavaScript language with well detailed examples.