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: 

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<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>

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Output: 

228

Example 2: 

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<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>

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Output: 

405

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