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JavaScript Array copyWithin() Method

❮ JavaScript Array Reference

Copy the first two array elements to the last two array elements:

var fruits = ["Banana", "Orange", "Apple", "Mango"];

fruits.copyWithin(2, 0);

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The result of fruits will be:

Banana,Orange,Banana,Orange

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More "Try it Yourself" examples below.

Definition and Usage

The copyWithin() method copies array elements within the array, to and
from specified positions.

The numbers in the table specify the first browser version that fully supports the method.

Method
copyWithin()	45.0	12.0	32.0	9	32.0

array.copyWithin(target, start, end)

Parameter	Description
target	Required. The index position to copy the elements to
start	Optional. The index position to start copying elements from (default is 0)
end	Optional. The index position to stop copying elements from (default is array.length)

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Return Value:	An Array, the changed array
JavaScript Version:	ECMAScript 6

Copy the first two array elements to the third and fourth position:

var fruits = ["Banana", "Orange", "Apple", "Mango", "Kiwi", "Papaya"];

fruits.copyWithin(2, 0, 2);

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The output of the code above will be:

Banana,Orange,Banana,Orange,Kiwi,Papaya

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Try it Yourself »

❮ JavaScript Array Reference