[List] copy | Manual

[List] copy

Copies the list. The list object will answer this message by returning a shallow copy of itself. This means that the values in the newly returned list can be replaced or deleted without affecting the original one. However, modifying the values in the list will still cause their counterparts in the original list to be modified as well. In the example we replace the first item (1) in b with 999. The first element in a will still be 1 though because we have created copy b by sending the message 'copy' to a and assiging the result to b.

 ☞ a := List ← 1 ; 2 ; 3.
 ☞ b := a copy.
 b put: 999 at: 1.

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