Higher Order Function in Ruby

play.rb

#
# Intro to Higher Order Functions
#
# translated to Ruby from Martin Scala Coursera.org class
#

def cube(n)
  n ** n 
end

def square(n)
  n ** 2
end

def sum_ints(a,b)
  if a > b
    return 0 
  else 
    return a + sum_ints(a + 1, b)
  end
end

def sum_square(a,b)
  if a > b
    return 0
  else
    square(a) + sum_square(a + 1, b)
  end
end


def sum_cubes(a,b)
  if a > b
    return 0
  else
    cube(a) + sum_cubes(a + 1, b)
  end
end


@l_square = lambda { |x| x * 2 }
@l_cube  =   lambda { |x| x ** x }
@l_ident =   lambda { |x| x }


def zomg_sum(f,a,b)
  if a > b 
    return 0
  else
    f.call(a) + zomg_sum(f,a + 1, b)
  end
end