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Contents
defmodule Anagram do
@doc """
Returns those words that are anagrams of the `w` word.
Comparison is case insensitive.
"""
@spec match(String.t(), [String.t()]) :: [String.t()]
def match(target, words) do
lc_target = String.downcase(target)
sorted_target = sort(lc_target)
Enum.filter(words, fn word ->
lc_word = String.downcase(word)
# `and` is shortcutting
lc_word != lc_target and sort(lc_word) == sorted_target
end)
end
defp sort(s) do
# :lists.sort is specialized on lists, which saves the overhead of the
# reduce based Enum functions.
String.graphemes(s) |> :lists.sort()
end
end
Version data entries
69 entries across 69 versions & 1 rubygems