JavaScript String lastIndexOf() Method

JavaScript string lastIndexOf() Method with example, by string literal, by string object (using new keyword), javascript string methods, charAt(index) method, concat(str) method, indexOf(str) method, lastIndexOf(str) method, lowerCase() method, upperCase() method, slice(beginIndex, endIndex) method, trim() method, toLowerCase(), slice(), concat(), charCodeAt() method etc.

<< Back to JAVASCRIPT

next → ← prev

JavaScript String lastIndexOf() method

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

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

Syntax

These are the following ways used to search the position of an element.

Method	Description
lastIndexOf(ch)	It returns the last index position of char value passed with method.
lastIndexOf(ch,index)	It starts searching the element from the provided index value in the inverse order and then returns the index position of specified char value.
lastIndexOf(str)	It returns the index position of first character of string passed with method.
lastIndexOf(str,index)	It starts searching the element from the provided index value and then returns the index position of first character of string.

Parameters

ch - It represent the single character to search like 'a'.

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

str - It represent the string to search like "Java".

JavaScript String lastIndexOf() method example

Let's see the various ways of searching the position of an element with help of simple examples.

Example 1

Here, we will print the position of a single character.

<script>
var web="Learn JavaScript on TheDeveloperBlog";
document.write(web.lastIndexOf('a'));
</script>

Test it Now

Output:

Example 2

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

<script>
var web="Learn JavaScript on TheDeveloperBlog";
document.write(web.lastIndexOf('a',22));
</script>

Test it Now

Output:

Example 3

Here, we will print the position of a first character of string.

<script>
var web="Learn JavaScript on TheDeveloperBlog";
document.write(web.lastIndexOf("Java"));
</script>

Test it Now

Output:

Example 4

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

<script>
var web="Learn JavaScript on TheDeveloperBlog";
document.write(web.lastIndexOf("Java",19));
</script>

Test it Now

Output:

Example 5

Here, we will try to search the element by changing its case-sensitivity.

<script>
var web="Learn JavaScript on TheDeveloperBlog";
document.write(web.lastIndexOf("java"));
</script>

Test it Now

Output:

-1

Next TopicJavaScript String

← prev next →

.Net

.NET Array Dictionary List String 2D Async DataTable Dates DateTime Enum File For Foreach Format IEnumerable If IndexOf Lambda LINQ Parse Path Process Property Regex Replace Sort Split Static StringBuilder Substring Switch Tuple

Java

Core Array ArrayList HashMap String 2D Cast Character Console Deque Duplicates File For Format HashSet If IndexOf Lambda Math ParseInt Process Random Regex Replace Sort Split StringBuilder Substring Switch Vector While

TheDeveloperBlog.com

JavaScript String lastIndexOf() Method

JavaScript String lastIndexOf() method

Syntax

Parameters

JavaScript String lastIndexOf() method example

Example 1

Example 2

Example 3

Example 4

Example 5

Related Links:

.Net

Java

Related Links