Synopsis Select a field (column) from a list relation value.
Syntax
Exp . Name
Types
Exp | Exp . Name |
|---|---|
lrel[T1 L1, T2 L2, ... ] | list[Ti] |
Description
Exp should evaluate to a list relation that has an i-th field label Li that is identical to Name.
Return a list with all values of that field.
Name stands for itself and is not evaluated.
Examples
rascal>lrel[str street, int nm] R = [<"abc", 1>, <"abc", 2>, <"def", 4>, <"def", 5>]; lrel[str street,int nm]: [ <"abc",1>, <"abc",2>, <"def",4>, <"def",5> ] rascal>R.street; list[str]: ["abc","abc","def","def"]
Questions
Question [1].
Question [2].