Ruby Array Hash what is that output code? Help with understabding this task

Question

class Array
def fun
myhash = {:one => method(:reverse!),:two => method(:pop) }
3.times do
myhash.each do |key,value|
my hash[key].call
end
end
end
end

array =[1, 2, 3, 4, 5]
array.fun
print array[0] -array[-1]
# help with understabding

Answer 1

3 раза вызывается каждый из ключей:
1) reverse! array=[5,4,3,2,1]
pop array=[5,4,3,2]
2) reverse! array=[2,3,4,5]
pop array=[2,3,4]
3) reverse! array=[4,3,2]
pop array=[4,3]
array[0]-array[1]=1