JavaScript String lastIndexOf() Method
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JavaScript String lastIndexOf() Method
The lastIndexOf() method returns the position of the last occurrence of a specified value in a string.
Note: The string is searched backwards, starting at start index.
Note: This method is case sensitive.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var str = "the end will never end";
var result = str.lastIndexOf("end");
document.write(result);
</script>
</body>
</html>
Syntax
str.lastIndexOf(searchString, startFrom)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| searchString | Required | Specifies the characters to be searched for within this string. |
| startFrom | optional | lastIndexOf() by default reads the string from right to left. Specifies the starting position of a string (str) from right to left. If omitted, the default value is '0'. |
Return Value
| Value | Condition |
|---|---|
| -1 | When the searched value is not found within this string. |
| 0 to str.length | A index of a search value within this string. |
lastIndexOf() with Specified Starting Position
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var str = "the end will never end";
var result = str.lastIndexOf("end", 10);
// str = "the end will";
document.write(result);
</script>
</body>
</html>
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