Nathan Kleyn nathankleyn

## gist_10_functional_ruby_part_iii.rb
(1..100).lazy.select { |x| x % 3 == 0 }.select { |x| x % 4 == 0 }.to_a

## gist_9_functional_ruby_part_iii.rb
(1..100).select { |x| x % 3 == 0 }.select { |x| x % 4 == 0 }

## gist_8_functional_ruby_part_iii.rb
a = []
Prime.each do |x|
  next unless x.to_s.include?('3')
  a << x
  break if a.size == 20
end

## gist_7_functional_ruby_part_iii.rb
Prime.lazy.select { |x| x.to_s.include?('3') }.take(20).to_a
Prime.lazy.select { |x| 100.to_s.chars.map(&:to_i).inject(:+) }.take(20).to_a

## gist_6_functional_ruby_part_iii.rb
def fact(n)
  (1..n).inject(:*) || 1
end

## gist_5_functional_ruby_part_iii.rb
x = [1, 2, 3]

enum = x.each
puts enum.class # => Enumerator
puts enum.next # => 1
puts enum.next # => 2
puts enum.next # => 3
puts enum.next # => StopIteration exception

## gist_4_functional_ruby_part_iii.rb
puts = [1, 2, 3].each.class # => Enumerator

## gist_3_functional_ruby_part_iii.rb
def fact(n)
  factorial = 1

  begin
    factorial *= n--
  end while n > 1

  factorial
end

## gist_2_functional_ruby_part_iii.txt
fact(6) = 6 * fact(5)
        = 6 * 5 * fact(4)
        = 6 * 5 * 4 * fact(3)
        = 6 * 5 * 4 * 3 * fact(2)
        = 6 * 5 * 4 * 3 * 2 * fact(1)
        = 6 * 5 * 4 * 3 * 2 * 1
        = 720

## gist_1_functional_ruby_part_iii.rb
def fact(n)
  return 1 if (0..1).include?(n)
  n * fact(n - 1)
end
	a = []
	Prime.each do \|x\|
	next unless x.to_s.include?('3')
	a << x
	break if a.size == 20
	end
	Prime.lazy.select { \|x\| x.to_s.include?('3') }.take(20).to_a
	Prime.lazy.select { \|x\| 100.to_s.chars.map(&:to_i).inject(:+) }.take(20).to_a
	x = [1, 2, 3]

	enum = x.each
	puts enum.class # => Enumerator
	puts enum.next # => 1
	puts enum.next # => 2
	puts enum.next # => 3
	puts enum.next # => StopIteration exception
	def fact(n)
	factorial = 1

	begin
	factorial *= n--
	end while n > 1

	factorial
	end
	fact(6) = 6 * fact(5)
	= 6 * 5 * fact(4)
	= 6 * 5 * 4 * fact(3)
	= 6 * 5 * 4 * 3 * fact(2)
	= 6 * 5 * 4 * 3 * 2 * fact(1)
	= 6 * 5 * 4 * 3 * 2 * 1
	= 720