A.Enum.map_join
You're seeing just the function
map_join
, go back to A.Enum module for more information.
Specs
map_join(t(val), String.t(), (val -> String.Chars.t())) :: String.t() when val: value()
Maps and joins the given enumerable
in one pass.
Mirrors Enum.map_join/3
with higher performance for Aja structures.