RosettaCodeData/Task/Apply-a-callback-to-an-array/GAP/apply-a-callback-to-an-arra...

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a := [1 .. 4];
b := ShallowCopy(a);
# Apply and replace values
Apply(a, n -> n*n);
a;
# [ 1, 4, 9, 16 ]
# Apply and don't change values
List(b, n -> n*n);
# [ 1, 4, 9, 16 ]
# Apply and don't return anything (only side effects)
Perform(b, Display);
1
2
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4
b;
# [ 1 .. 4 ]