[List] copy | Manual
Copies the array. The array object will answer this message by
returning a shallow copy of itself. This means that the values in the
newly returned array can be replaced or deleted without affecting
the original array. However, modifying the values in the array will
still cause their counterparts in the original array to be modified
☞ a := List ← 1 ; 2 ; 3. ☞ b := a copy. b put: 999 at: 1. #b @ 1 = 999
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