Synopsis Map restricted to certain keys.
Function map[&K, &V] domainR(map[&K, &V] M, set[&K] S)
Usage import Map;
Description Return the map M restricted to pairs with key in S.
rascal>import Map;
rascal>domainR(("apple": 1, "pear": 2, "orange": 3), {"apple", "pear"});
map[str, int]: ("pear":2,"apple":1)
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