Now I know I'm only just scratching the surface of this whole Elixir thing, but I have a sneaking suspicion I'm going to be feeling lots of deja vu...

~% irb
2.0.0p247 :001 > name = "world"
 => "world"
2.0.0p247 :002 > "Hello, #{name}!"
 => "Hello, world!"
2.0.0p247 :003 >

~% iex
Erlang R16B01 (erts-5.10.2) [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Interactive Elixir (0.10.0) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> name = "world"
"world"
iex(2)> "Hello, #{name}!"
"Hello, world!"
iex(3)>