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leikind/bin2dec.exs

Created October 31, 2014 09:24
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Binary to decimal
Raw
bin2dec.exs
defmodule Bin2Dec do
import List, only: [duplicate: 2]
import Enum
def bin2dec(bin) when is_binary(bin) do
bin
|> String.codepoints
|> reverse
|> map( &(String.to_integer/1))
|> with_index
|> map(fn({d, idx}) -> duplicate(2, idx) |> reduce(d, &(*/2) ) end)
|> sum
end
end
IO.inspect Bin2Dec.bin2dec("11")
IO.inspect Bin2Dec.bin2dec("111")
IO.inspect Bin2Dec.bin2dec("101")
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