JavaScript string lastIndexOf method

JavaScript lastIndexOf method start searching from last to the string and return index of searchValue if searchValue exist in string otherwise return -1

Syntax

string.lastIndexOf(searchValue)

string.lastIndexOf(searchValue,fromIndex)

Example

<script>
  var name = 'John the Don is Don'
  name.lastIndexOf('Don'); //16
</script>

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Parameter Details

Parameter	Description
searchValue	searchValue is a substring that you want to search in string
fromIndex	optional - fromIndex decide the index to start searching in reverse order in string

Technical Details

Return	lastIndexOf method return index of first searchValue if exist otherwise return -1

Return

lastIndexOf method return index of first searchValue if exist otherwise return -1

Browser support

Browser
Version	yes	yes	yes	yes	yes

Tips - When searchValue(substring) present more than one time in string then lastIndexOf method return index of first searchValue

Example

<script>
var name = 'John the Don is Don'
string.lastIndexOf('Don'); // 16
string.lastIndexOf('Don'); //
</script>

Try it Yourself

Note - if searchValue exist in string but not exist in specify in range then lastIndexOf method return -1

Example

<script>
  var name = 'John the Don is Don'
  name.lastIndexOf('Don',8); // -1
  //Range is 0-8
  //lastIndexOf method start searching to last of the string
</script>

lastIndexOf method case-sensitive

lastIndexOf method are case-sensitive searchvalue

Example

<script>
var name = 'John the Don'
name.lastIndexOf('don'); // -1
</script>

Try it Yourself

Related Articals

javascript indexOf method

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