14_array_extensions

gistfile1.rb

class Array
	def sum
		answer = 0
		self.each do |number|
			answer = answer + number
		end
		answer
	end

	def square
		answer = []
		self.each do |number|
			answer << number*number
		end
		answer
	end

	def square!
		counter = 0
		self.length.times do 
			self[counter] = self[counter] * self[counter]
			counter +=1
		end
	end


end