JavaScript TypedArray reduce() Method

by Online Tutorials Library July 22, 2022

JavaScript TypedArray reduce() Method

The JavaScript reduce() method reduces the elements of an array into a single value and the returned value of the function is stored in an accumulator and each element in the array (from left to right) has to reduce it to a single value.

Note: Calling reduce() on an empty array without an initial value is an error.

Syntax:

Parameters:

Total(required): The previously returned value of the function.

CurrentValue(Required): The value of the current element.

Index(Optional): The index of the current element being processed in the array. Starts at index 0.

Arr(Optional): The array reduce() was called upon.

InitialValue(Optional): A value to be passed to the function as the initial value.

Return value:

Return the reduced single value of the array.

Browser Support:

Chrome	Yes
Safari	4
Firefox	3.0
Opera	10.5

Example 1

JavaScript reduce() Method

  <script type=”text/javascript”>  // JavaScript to illustrate reduce() method  let TutorAspire =[10,20,30];  // find the sum of all the elements   let sum = TutorAspire .reduce(function(passedIn, item)  {  return passedIn + item;  // 0 is intial value   },0);   document.write(‘Array sum is ‘,sum,’n’);  // expected output: TutorAspire [Output: 60]   

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Output:

Example 2

JavaScript reduce(initialValue) Method

  <script type=”text/javascript”>  // JavaScript to illustrate reduce() method  let TutorAspire =[10,20,30];  // find the sum of all the elements   let sum=TutorAspire.reduce(function(passedIn, item)  {  return passedIn + item;  // 5 is intial value   },5);   document.write(‘Array sum is ‘,sum,’n’);  // expected output: TutorAspire [Output: 65]      </script>  

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Output:

Example 3

JavaScript reduce() Method

  <script>  // JavaScript to illustrate reduce() method  // Taking some array as the element of an array “A”  var A = [ [‘Java’,’MongoDB’ ], [‘python’,’C’], [ ‘RDBMS’, ‘C++’ ] ];  // Calling array.reduce() function  a = A.reduce((previousValue, currentValue) => previousValue.concat(currentValue));  // printing result  document.write(a);  // expected output: Java,MongoDB,python,C,RDBMS,C++  </script>  

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Output:

Java, MongoDB, python, C, RDBMS, C++

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JavaScript TypedArray reduce() Method

JavaScript TypedArray reduce() Method

Note: Calling reduce() on an empty array without an initial value is an error.

Syntax:

Parameters:

Return value:

Browser Support:

Example 1

Example 2

Example 3

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