JavaScript Array lastIndexOf() method

The JavaScript array lastIndexOf() method is used to search the position of a particular element in a given array. It behaves similar to indexOf() method with a difference that it start searching an element from the last position of an array.

The lastIndexOf() method is case-sensitive. The index position of first character in a string is always start with zero. If an element is not present in a string, it returns -1.

Syntax

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

Parameter

element - It represent the element to be searched.

index - It represent the index position from where search starts. It is optional.

Return

An index of a particular element.

JavaScript Array lastIndexOf() method example

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

Example 1

Here, we will print the position of an element.

Output:

3

Example 2

In this example, we will provide the index value from where the search starts.

Output:

1

Example 3

Here, we will search an element which is not present in an array.

Output:

-1