條件語句

請注意，do...end 語法是常規關鍵字列表的語法糖，因此你實際上可以這樣做：

unless false, do: IO.puts("Condition is false")
# Outputs "Condition is false"

# With an `else`:
if false, do: IO.puts("Condition is true"), else: IO.puts("Condition is false")
# Outputs "Condition is false"