Created
December 7, 2016 23:17
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defmodule Sieve.Eratosthenes do | |
def primes_to(n) do | |
sieve([], candidates(n)) | |
end | |
defp sieve(primes, []) do | |
primes | |
end | |
defp sieve(primes, [h | t]) do | |
sieve(primes ++ [h], reject_numbers(h, t)) | |
end | |
def candidates(n) do | |
Enum.into 2..n, [] | |
end | |
def reject_numbers(factor, numbers) do | |
Enum.reject numbers, fn x -> rem(x,factor) == 0 end | |
end | |
end |
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