The Javascript typedArray.copyWithin() is an inbuilt function in JavaScript that is used to copy some elements of a typedArray at the specified location in the same typedArray.
Syntax:
typedArray.copyWithin(target, start, end)
Parameters: It accepts three parameters that are specified below-
- target: It is the start index position from where to copy the element.
- start: It is the start index position from where to start copying elements and its default value is starting index of the typedArray.
- end: It is optional and it is the end position index till the elements are to be copied and its default value is the end of the typedArray.
Return value: It returns the modified array after the copying process is done.
JavaScript examples to show the working of this function:
Example 1: This example shows the use of typedArray.copyWithin() function with all parameters.
javascript
<script> // Constructing a new typedArray "A" // with some elements const A = new Uint8Array([ 5, 10, 15, 20, 25, 30, 35, 40 ]); // Calling copyWithin function to copy // element from index position 0 and // element from index 4 to 5 A.copyWithin(0, 4, 5); // Printing a new modified array console.log(A); </script> |
Output:
25,10,15,20,25,30,35,40
Example 2: This example shows the use of typedArray.copyWithin() function with all parameters.
javascript
<script> // Constructing some new typedArrays // with some elements const A = new Uint8Array([ 5, 10, 15, 20, 25, 30, 35, 40 ]); const B = new Uint8Array([ 5, 10, 15, 20, 25, 30, 35, 40 ]); const C = new Uint8Array([ 5, 10, 15, 20, 25, 30, 35, 40 ]); const D = new Uint8Array([ 5, 10, 15, 20, 25, 30, 35, 40 ]); const E = new Uint8Array([ 5, 10, 15, 20, 25, 30, 35, 40 ]); // Calling copyWithin function with different // parameters a = A.copyWithin(0, 5); b = B.copyWithin(1, 4); c = C.copyWithin(0, 4, 5); d = D.copyWithin(2, 3, 5); e = E.copyWithin(0, 1, 4); // Printing new modified arrays console.log(a); console.log(b); console.log(c); console.log(d); console.log(e); </script> |
Output:
30,35,40,20,25,30,35,40 5,25,30,35,40,30,35,40 25,10,15,20,25,30,35,40 5,10,20,25,25,30,35,40 10,15,20,20,25,30,35,40
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