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Levenshtein Distance in Elixir
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| defmodule LevenShteinDistance do | |
| def compare_distance(str, ""), do: String.length(str) | |
| def compare_distance("", str), do: String.length(str) | |
| def compare_distance(str, str), do: 0 | |
| def compare_distance(str1, str2) do | |
| [first1, rest1] = pattern_str(str1) | |
| [first2, rest2] = pattern_str(str2) | |
| if first1 === first2 do | |
| compare_distance(rest1, rest2) | |
| else | |
| result = [ | |
| compare_distance(str1, rest2), | |
| compare_distance(rest1, str2), | |
| compare_distance(rest1, rest2) | |
| ] | |
| 1 + Enum.min(result) | |
| end | |
| end | |
| defp pattern_str(str) when is_binary(str) do | |
| <<head, tail::binary>> = str | |
| [<<head>>, tail] | |
| end | |
| end |
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