TypeScript | Array lastIndexOf() Method

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