Sam Gerber SamGerber-zz

SamGerber-zz / universe.rb

Created December 9, 2015 05:44

Setting Instance Variables Explicitly Within the Class

	class Universe
	def initialize
	@answer = "42"
	end
	end

	universe = Universe.new # => #<Universe:0x007f4b34292288 @answer="42">
	universe.instance_variables # => [:@answer]

SamGerber-zz / universe.rb

Created December 9, 2015 06:34

	class Universe
	def initialize
	@answer = "42"
	end
	end

	universe = Universe.new # => #<Universe:0x007f4b34292288 @answer="42">
	universe.instance_variables # => [:@answer]

SamGerber-zz / universe.rb

Created December 9, 2015 06:41

Setting Instance Variables with a Setter Method

	class Universe
	def answer=(something)
	@answer = something
	end
	end

	universe = Universe.new # => #<Universe:0x007f639f31b8e8>
	universe.instance_variables # => []
	universe.answer = "42" # => "42"
	universe.instance_variables # => [:@answer]

SamGerber-zz / universe.rb

Created December 9, 2015 06:45

Setting Instance Variables Using an Attribute Writer

	class Universe
	attr_writer :answer
	end

	universe = Universe.new # => #<Universe:0x007f9ac4572e78>
	universe.instance_variables # => []
	universe.answer = "42" # => "42"
	universe.instance_variables # => [:@answer]

SamGerber-zz / universe.rb

Created December 9, 2015 06:49

Getting Instance Variables Explicitly Within the Class

	class Universe
	def initialize
	@answer = "42"
	puts @answer # Get @answer and pass it to Kernel#puts.
	end
	end

	universe = Universe.new # printed 42 and returned <Universe:0x007fcdef8fb000 @answer="42">

SamGerber-zz / universe.rb

Created December 9, 2015 06:50

Getting Instance Variables with a Getter Method

	class Universe
	def initialize
	@answer = "42"
	end

	def answer
	return @answer # Explicit return for clarity
	end
	end

SamGerber-zz / universe.rb

Created December 9, 2015 06:52

Getting Instance Variables Using an Attribute Reader

	class Universe
	attr_reader :answer

	def initialize
	@answer = "42"
	end
	end

	universe = Universe.new # => #<Universe:0x007f644d49de10 @answer="42">
	universe.answer # => "42"

SamGerber-zz / universe.rb

Created December 9, 2015 06:54

Getting and Setting Instance Variables Using an Attribute Accessor

	class Universe
	attr_accessor :answer

	def initialize
	@answer = "42"
	end
	end

	universe = Universe.new # => #<Universe:0x007f63e303e848 @answer="42">
	universe.answer # => "42"

SamGerber-zz / value.rb

Last active December 9, 2015 06:57

Does manipulating a string change its value?

SamGerber-zz / setter.rb

Created December 9, 2015 07:35

Setter with "value