Koan added following comment on Github.
https://github.com/elixirkoans/elixir-koans/issues/222#issuecomment-399979891
[quote]
And, in fact, you can define multiple cases for a function using this sytnax:
```
lolwat = fn
"lol" -> "wat"
_ -> "haha"
end
lolwat.("lol")
# => "wat"
lolwat.("anything")
# => "haha"
lolwat.("rly")
# => "haha"
```
[/quote]
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