RosettaCodeData/Task/Add-a-variable-to-a-class-instance-at-runtime/Sidef/add-a-variable-to-a-class-instance-at-runtime.sidef

class Empty{};
var e = Empty();    # create a new class instance
e{:foo} = 42;       # add variable 'foo'
say e{:foo};        # print the value of 'foo'