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TypeScript | Array lastIndexOf() Method
  • Last Updated : 18 Jun, 2020

The Array.lastIndexOf() is an inbuilt TypeScript function which is used to get the last index at which a given element can be found in the array. 
 Syntax:

array.lastIndexOf(searchElement[, fromIndex])

Parameter: This method accepts two parameter as mentioned above and described below: 

  • searchElement : This parameter is the element to locate in the array.
  • fromIndex : This parameter is the index at which to start searching backwards.

Return Value: This method returns the index of the found element from the last. 
Below examples illustrate the Array lastIndexOf() method in TypeScript.
Example 1: 

JavaScript




<script>
    // Driver code
    var arr = [ 11, 89, 23, 7, 98 ]; 
  
    // use of lastIndexOf() method 
    var val = arr.lastIndexOf(7)
       
    // printing element
    console.log( val );
</script>

Output: 



3

Example 2: 

JavaScript




<script>
    // Driver code
    var arr = [ 'a','b','c','a','e' ]; 
  
    // use of lastIndexOf() method 
    var val = arr.lastIndexOf("a")
    var val1 = arr.lastIndexOf("c")
       
    // printing element
    console.log(val);
    console.log(val1);
</script>

Output: 

3
2
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