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Contents
defmodule Hamming do
@doc """
Returns number of differences between two strands of Hamming, known as the Hamming Distance.
## Examples
iex> Hamming.hamming_distance('AAGTCATA', 'TAGCGATC')
{:ok, 4}
"""
def hamming_distance(strand1, strand2) when length(strand1) === length(strand2) do
distance = pairs(strand1, strand2) |> count_mismatched
{:ok, distance}
end
def hamming_distance(_, _), do: {:error, "Lists must be the same length"}
defp pairs(s1, s2), do: Enum.zip(s1, s2)
defp count_mismatched(pairs), do: Enum.count(pairs, fn({c1, c2}) -> c2 && (c1 != c2) end)
end
Version data entries
327 entries across 327 versions & 1 rubygems