JavaScript TypedArray keys() Method

The keys method in JavaScript is a built-in function. This method produces an Array Iterator object that contains the keys of an array.

What is Iterator?

An iterator is a construct that monitors its current position as it retrieves items from a collection sequentially, one at a time.

An iterator produces an object that contains two attributes: key and value.

Syntax:

array.keys()

Parameters:

No parameters.

Return value:

It produces a fresh array iterator instance that includes the keys corresponding to each index of the elements within the specified array.

Browser Support:

Example

JavaScript TypedArray keys Method

<script type="text/javascript">

// JavaScript to illustrate keys() method

// Creating some typedArrays

  var A = new Uint8Array([1, 2, 3, 4, 5]);

  var B = new Uint8Array([5, 10, 15, 20]);

 



   a = A.keys()

   document.write(a.next().value +"<br>");

    

   b = B.keys()

   b.next();

   document.write(b.next().value +"<br>");

   // expected output: arr[Output:0 1]

     

</script>

Output: