JavaScript | typedArray.subarray() with Examples

The typedArray.subarray() is an inbuilt function in JavaScript which is used to return a part of the typedArray object.
Syntax:

typedarray.subarray(begin, end)

Parameters: It accepts two parameters which are described below:

  1. begin: It specifies the index of the starting element from which the part of the given array to be started. It is optional and inclusive.
  2. end: It specifies the index of the ending element up to which the part of the given array to be included. It is optional and exclusive.

Return value: It returns a new array which is formed from the given typedArray object.

JavaScript code to show the working of this function:

Code #1:

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<script>
  
   // Creating a new typedArray Uint8Array() object
   const A = new Uint8Array([5, 10, 15, 20, 25, 30, 35 ]);
  
   // Calling subarray() functions
   B = A.subarray(1, 3)
   C = A.subarray(1)
   D = A.subarray(3)
   E = A.subarray(0, 6)
   F = A.subarray(0)
     
   // Printing some new typedArray which are
   // the part of the given input typedArray
   document.write(B +"<br>");
   document.write(C +"<br>");
   document.write(D +"<br>");
   document.write(E +"<br>");
   document.write(F +"<br>");
  
</script>

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Output:

10,15
10,15,20,25,30,35
20,25,30,35
5,10,15,20,25,30
5,10,15,20,25,30,35

Code #2:
When index are in negative then elements get accessed from the end of the typedArray object.

Below is the required code which illustrates this negative indexing concept.

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<script>
  
   // Creating a new typedArray Uint8Array() object
   const A = new Uint8Array([5, 10, 15, 20, 25, 30, 35 ]);
  
   // Calling subarray() functions
   B = A.subarray(-1)
   C = A.subarray(-2)
   D = A.subarray(-3)
   E = A.subarray(3)
   F = A.subarray(0)
     
   // Printing some new typedArray which are
   // the part of the given input typedArray
   document.write(B +"<br>");
   document.write(C +"<br>");
   document.write(D +"<br>");
   document.write(E +"<br>");
   document.write(F +"<br>");
  
</script>

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Output:

35
30,35
25,30,35
20,25,30,35
5,10,15,20,25,30,35


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