using_yield.rb

def do_twice
  yield
  yield
end

# The basics
do_twice {puts "HOLA"}


def do_something_to_an_array (array)
  yield(array)
end

# Basics + Arguments
do_something_to_an_array([1,2,3,]) {|x| puts "Yeah... #{x}"}


def do_something_to_an_array_elements (arr)
  i=0
  while i < arr.length

    # We are gonna yield code instead of using a pre-define method
    this_is_the_yield(arr[i])
    # You can comment line 23 and use line 25 and execute 36 instead of 35...
    # yield(arr[i])
    i+=1
  end
end

def this_is_the_yield (some_sweet)
  puts "im doing something with the element of the array #{some_sweet}"
end

# Yeah!! One way to use this... 
do_something_to_an_array_elements([1,2,3,])
# do_something_to_an_array_elements([1,2,3,]) {|y| puts y**2}