tyamagu2/project_euler.ex

## project_euler.ex
# 1. Find the sum of all the multiples of 3 or 5 below 1000.
1..999 |> Enum.filter(&(rem(&1, 3) == 0 || rem(&1, 5) == 0)) |> Enum.reduce(&+/2)

# 2. By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
Stream.unfold({1, 2}, fn {n1, n2} -> {n1, {n2, n1 + n2}} end) |> Stream.filter(&(rem(&1, 2) == 0)) |> Enum.take_while(&(&1 < 4000_000)) |> Enum.reduce(&+/2)
	# 1. Find the sum of all the multiples of 3 or 5 below 1000.
	1..999 \|> Enum.filter(&(rem(&1, 3) == 0 \|\| rem(&1, 5) == 0)) \|> Enum.reduce(&+/2)

	# 2. By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
	Stream.unfold({1, 2}, fn {n1, n2} -> {n1, {n2, n1 + n2}} end) \|> Stream.filter(&(rem(&1, 2) == 0)) \|> Enum.take_while(&(&1 < 4000_000)) \|> Enum.reduce(&+/2)