Adriana Molano adrimolano

Classical Inheritance in Ruby

For programmers who are new to Object Oriented Programming, the ideas behind classical inheritance can take some getting used to. This article walks you through the syntax of defining class inheritance in Ruby with explanations of each OOP feature along the way. You will have created many inheriting classes and used them in Ruby code by the end of this exercise.

Create a new Ruby code file and copy the code examples into it as you go. Run the file with the provided driver code and read the output. Try writing your own driver code to try things out new concepts as they're introduced.

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	require 'active_support/all'

	@candidates = [
	{
	id: 1,
	years_of_experience: 4,
	github_points: 293,
	languages: ['C', 'Ruby', 'Python', 'Clojure'],
	date_applied: 5.days.ago.to_date,
	age: 26

	# Determine whether a string contains a SIN (Social Insurance Number).
	# A SIN is 9 digits and we are assuming that they must have dashes in them
	def has_sin?(string)
	if string =~ /(\d{3})-(\d{3})-(\d{3})/
	true
	else
	false
	end
	end

	def benchmark
	beginning_time = Time.now
	yield
	end_time = Time.now
	running_time = end_time - beginning_time
	end

	# Be careful, pasting this into IRB will take a long time to print.
	# It's a loooong string. :)
	long_string = "apple"*100000000

	@states = {
	OR: 'Oregon',
	FL: 'Florida',
	CA: 'California',
	NY: 'New York',
	MI: 'Michigan'
	}
	@states[:IL] = "Illinois"
	@states[:NJ] = "New Jersey"

	list = {:yvr => "Vancouver", :yba => "Banff", :yyz => "Toronto", :yxx => "Abbotsford", :ybw => "Calgary"}

	# Why is it returning nil instead of first element of the list above
	puts list.values[0]
	puts list[:yvr]

	def shakil_the_dog
	puts "Shakil the Dog is waiting for you. "
	puts "-- Type 'woof' to bark and pretend to be a dog."
	puts "-- Type 'Shakil STOP!' to make him stop."
	puts "-- Type 'meow' to pretend to be a cat."
	puts "-- Type whaetver with 'treat' on it."
	puts "-- Type 'go away' to make him leave."
	loop do
	you_say = gets.chomp
	you_say.downcase!

	# Find the maximum
	def maximum(arr)
	arr.max
	end

	# expect it to return 42 below
	result = maximum([2, 42, 22, 02])
	puts "max of 2, 42, 22, 02 is: #{result}"

	# expect it to return nil when empty array is passed in