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Contents
defmodule SecretHandshake do
use Bitwise
@codes ["wink", "double blink", "close your eyes", "jump"]
@doc """
Determine the actions of a secret handshake based on the binary
representation of the given `code`.
If the following bits are set, include the corresponding action in your list
of commands, in order from lowest to highest.
1 = wink
10 = double blink
100 = close your eyes
1000 = jump
10000 = Reverse the order of the operations in the secret handshake
"""
@spec commands(code :: integer) :: list(String.t())
def commands(code) do
@codes
|> Enum.with_index
|> Enum.map(fn {command, i} -> { command, 2 <<< (i-1) } end)
|> decode_commands(code, [])
end
defp decode_commands([], code, results) do
case flag_set(code, 16) do
true -> results
_ -> Enum.reverse(results)
end
end
defp decode_commands([{ command, flag } | flags], code, results) do
case flag_set(code, flag) do
true -> decode_commands(flags, code, [command | results])
_ -> decode_commands(flags, code, results)
end
end
defp flag_set(flags, flag_to_check), do: (flags &&& flag_to_check) == flag_to_check
end
Version data entries
188 entries across 188 versions & 1 rubygems