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dramsay/cons.ex

Last active September 14, 2015 12:36
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cons.ex
defmodule Cons do
def each_cons(list, num) when length(list) < num, do: []
def each_cons(list, num) do
[ _ | tail ] = list
cons = Enum.take(list, num)
[ cons | each_cons(tail, num) ]
end
end
iex(1)> Cons.each_cons(String.to_char_list("abacabaca"), 4)
['abac', 'baca', 'acab', 'caba', 'abac', 'baca']
iex(2)> Cons.each_cons(String.to_char_list("abacabaca"), 3)
['aba', 'bac', 'aca', 'cab', 'aba', 'bac', 'aca']
iex(3)> Cons.each_cons(String.to_char_list("abacabaca"), 2)
['ab', 'ba', 'ac', 'ca', 'ab', 'ba', 'ac', 'ca']
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dramsay commented Sep 14, 2015

Great feedback - thanks! I should have caught the syntax issue with default parameters. Just getting started with Elixir but really liking it.

I would love to go to ElixirConf sometime, but unfortunately won't be making it this year. Hope to catch up with you soon, though.

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