Imperative vs Functional

functional_vs_imperative

puts "Hello. Welcome to the Functional World!"

# This is how to do it imperative style (Stupid Java programmer)
array = [1,2,3,4]
new_array = []
array.each do |n|
  if n % 2 == 0
    new_array.push n
  end

  # alternate syntax
  new_array.push n if n % 2 == 0
end


# This is another way to do it imperative style (smarter Ruby programmer)
array = [1,2,3,4]
new_array = array.map do |n|
  if n.even?
    n
  else
    next
  end
end


# The truly functional way (smart Rubyist)
even_numbers = [1,2,3,4].select { |n| n.even? }

puts even_numbers