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TypeScript | String lastIndexOf() Method

  • Last Updated : 18 Jun, 2020

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
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