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JavaScript Array lastIndexOf() Method

JavaScript Array lastIndexOf() Method with example, javascript array methods, concat() method, every() method, filter() method, forEach() method, join() method, indexOf() method, lastIndexOf() method, map() method, push() method, slice() method, sort() method, unshift() method, toSource() method etc.

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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:

array.lastIndexOf(element,index)

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.

<script>
var arr=["C","C++","Python","C++","Java"];
var result= arr.lastIndexOf("C++");
document.writeln(result);
</script>
Test it Now

Output:

3

Example 2

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

<script>
var arr=["C","C++","Python","C++","Java"];
var result= arr.lastIndexOf("C++",2);
document.writeln(result);
</script>
Test it Now

Output:

1

Example 3

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

<script>
var arr=["C","C++","Python","C++","Java"];
var result= arr.lastIndexOf("JavaScript");
document.writeln(result);
</script>
Test it Now

Output:

-1

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