map -package:unordered-containers -package:containers -package:imports -package:bytestring -package:filepath -package:basement -package:conduit -package:charset -package:os-string package:text is:exact

map :: (Char -> Char) -> Text -> Text
text Data.Text
O(n) map f t is the Text obtained by applying f to each element of t. Example: 
>>> let message = pack "I am not angry. Not at all."

>>> T.map (\c -> if c == '.' then '!' else c) message
"I am not angry! Not at all!"
Performs replacement on invalid scalar values.
map :: (Char -> Char) -> Stream Char -> Stream Char
text Data.Text.Internal.Fusion.Common
O(n) map f xs is the Stream Char obtained by applying f to each element of xs. Properties 
unstream . map f . stream = map f
map :: (Char -> Char) -> Text -> Text
text Data.Text.Lazy
O(n) map f t is the Text obtained by applying f to each element of t. Performs replacement on invalid scalar values.