RosettaCodeData/Task/Interactive-programming/Elixir/interactive-programming-1.elixir

iex(1)> f = fn str1,str2,sep -> [str1,"",str2] |> Enum.join(sep) end # Join list on separator
iex(2)> g = fn str1,str2,sep -> str1 <> sep <> sep <> str2 end       # Or concatenate strings

iex(3)> defmodule JoinStrings do
...(3)>   def f(str1,str2,sep), do: [str1,"",str2] |> Enum.join(sep)
...(3)>   def g(str1,str2,sep), do: str1 <> sep <> sep <> str2
...(3)> end