36 lines
867 B
Elixir
36 lines
867 B
Elixir
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defmodule SecretHandshake do
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@doc """
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Determine the actions of a secret handshake based on the binary
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representation of the given `code`.
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If the following bits are set, include the corresponding action in your list
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of commands, in order from lowest to highest.
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1 1 = wink
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2 10 = double blink
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4 100 = close your eyes
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8 1000 = jump
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16 10000 = Reverse the order of the operations in the secret handshake
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"""
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@coms %{
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1 => "wink",
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2 => "double blink",
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4 => "close your eyes",
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8 => "jump",
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16 => "reverse"
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}
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@spec commands(code :: integer) :: list(String.t())
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def commands(code) do
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@coms
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|> Map.keys()
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|> Enum.reduce([], &if(Bitwise.band(code, &1) == &1, do: [@coms[&1] | &2], else: &2))
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|> case do
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["reverse" | tail] -> tail
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reversed_list -> Enum.reverse(reversed_list)
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end
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end
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end
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