TypeScript Array reduce() Method

The Array.reduce() is an inbuilt TypeScript function which is used to apply a function against two values of the array as to reduce it to a single value. 
Syntax:

array.reduce(callback[, initialValue])

Parameter: This method accept two parameter as mentioned and described below: 

• callback : This parameter is the Function to execute on each value in the array.
• initialValue : This parameter is the Object to use as the first argument to the first call of the callback.

Return Value: This method returns the reduced single value of the array. 
Below examples illustrate the  Array reduce() method in TypeScript

Example 1:

JavaScript

<script>
    // Driver code
    var arr = [ 11, 89, 23, 7, 98 ];

    // use of reduce() method
    var val = arr.reduce(function(a, b)
    {
        return a + b;
    });

    // printing element
    console.log( val );
</script>

Output:

228

Example 2:

JavaScript

<script>
    // Driver code
    var arr = [2, 5, 6, 3, 8, 9];
    var val;

    // use of reduce() method
    val = arr.reduce(function(a, b)
    {
        return a*b/2;
    });

    // printing element
    console.log( val );
</script>

Output:

405