suppose I have 2 associations
t1=<|"a" -> 1, "b" -> 2, "c" -> 3, "d" -> 4|> and
t2=<|"a" -> x, "a1" -> x^2, "b0" -> x^3, "b" -> x^4, "b1" -> x^5, "c" -> x^6, "c1" -> x^7, "c2" -> x^8, "d" -> x^9|> How can I from t2 select those elements that are in t1? The output would look like:
<|"a" -> x, "b" -> x^4,"c" -> x^6, "d" -> x^9|> I tried pick as Pick[t2,t1] yet it returns an empty sequence.
KeyIntersection[{t1, t2}][[2]] <|"a" -> x, "b" -> x^4, "c" -> x^6, "d" -> x^9|>
or
KeyTake[t2, Keys[t1]] <|"a" -> x, "b" -> x^4, "c" -> x^6, "d" -> x^9|>
Query[Keys[t1]]@t2 <|"a" -> x, "b" -> x^4, "c" -> x^6, "d" -> x^9|>
t2[[Keys @ t1]] <|"a" -> x, "b" -> x^4, "c" -> x^6, "d" -> x^9|>
KeySelect[t2, AssociationThread[Keys[t1] -> True]] (* or *) KeySelect[t2, MemberQ[Keys[t1], #] &] <|"a" -> x, "b" -> x^4, "c" -> x^6, "d" -> x^9|>
