The lastIndexOf() is an inbuilt function in TypeScript which is used to get the index within the calling String object of the last occurrence of the specified value.
Syntax:
string.lastIndexOf(searchValue[, fromIndex])
Parameter: This method accepts two parameter as mentioned above and described below:
- searchValue: This parameter is a string representing the value to search for.
- fromIndex: This parameter is a location within the calling string to start the search from.
Return Value: This method returns the index of the last found occurrence, otherwise -1 if not found.
Example 1:
JavaScript
<script> // Original strings var str1 = new String('TypeScript | \ String lastIndexOf() Method with example'); // use of String lastIndexOf() Method console.log(str1.lastIndexOf("String")); </script> |
Output:
17
Example 2:
JavaScript
<script> // Original strings var str1 = new String('TypeScript | \ String lastIndexOf() Method with example'); // use of String lastIndexOf() Method console.log(str1.lastIndexOf("Geeks")); </script> |
Output:
-1
