JavaScript Array copyWithin() Method

copyWithin()The method copies a part of the array to another position in the same array and returns it without modifying its size.

Syntax:

array.copyWithin(target, start, end)

Example

var　array1　=　[1,　2,　3,　4,　5];
array1.copyWithin(0,　3,　4);

The numbers in the table specify the first browser version that fully supports the copyWithin() method:

Method
copyWithin()	45	32	32	9	12

Parameter	Description
target	The index position to copy elements to
start	The index position to start copying elements from (this is optional)
end	The index position to stop copying elements from (this is optional)

Return Value:	Modified Array
JavaScript Version:	ECMAScript 6

If the parameter is a negative number, the target is calculated from the end:

Example

var　array1　=　[1,　2,　3,　4,　5];
array1.copyWithin(-2);