Ruby Classes and Modules - Revision history

Scott: /* Class Example */

2011-10-06T18:25:43Z

Class Example

← Older revision		Revision as of 18:25, 6 October 2011
Line 7:		Line 7:
	attr :value, true # true means a setter is created in addition to a getter		attr :value, true # true means a setter is created in addition to a getter
	attr_accessor :height, :width # create setters and getters		attr_accessor :height, :width # create setters and getters
			def to_s
			return @value
			end
	end		end

	t = Test.new(5)		t = Test.new(5)
	puts ~~"value is %d" %~~ t.value		puts t.value # prints 5
			puts t # prints 5 (calls the to_s method)
	t.height, t.width = 20, 30		t.height, t.width = 20, 30
	puts "height and width are %d and %d" % [t.height, t.width]		puts "height and width are %d and %d" % [t.height, t.width]

Scott: /* Class Example */

2011-10-05T18:21:44Z

Class Example

← Older revision		Revision as of 18:21, 5 October 2011
Line 13:		Line 13:
	t.height, t.width = 20, 30		t.height, t.width = 20, 30
	puts "height and width are %d and %d" % [t.height, t.width]		puts "height and width are %d and %d" % [t.height, t.width]
			</source>
			Single inheritance:
			<source lang="ruby">
			class MyClass < SuperClass
			...
			end
	</source>		</source>

Scott: /* Module Method Example */

2011-02-02T00:16:51Z

Module Method Example

New page

== Class Example ==
<source lang="ruby">
class Test
def initialize(value)
@value = value
end
attr :value, true # true means a setter is created in addition to a getter
attr_accessor :height, :width # create setters and getters
end

t = Test.new(5)
puts "value is %d" % t.value
t.height, t.width = 20, 30
puts "height and width are %d and %d" % [t.height, t.width]
</source>

== Module Example ==
<source lang="ruby">
module Dice
# virtual roll of a pair of dice
def roll
r1 = rand(6) + 1
r2 = rand(6) + 1
total = r1+r2
puts "You rolled %d and %d (%d)." % [r1, r2, total]
end
end

class Game
include Dice
end

g = Game.new
g.roll
</source>

== Module Method Example ==
<source lang="ruby">
module Binary
def Binary.to_bin(num)
bin = sprintf("%08b", num)
end
end

puts Binary.to_bin(123) # 01111011
</source>

== Counter Class Example ==
<source lang="ruby">
class Counter
def initialize
@counter = {}
@totalCount = 0
end

def add(object)
if not @counter.key? object
@counter[object] = 0
end
@counter[object] += 1
@totalCount += 1
end

def randomObject
index = rand(@totalCount)
keys = @counter.keys
i = 0
count = 0
key = keys[i]
while count <= index
count += @counter[key]
key = keys[i]
i += 1
end
return key
end

def size
return @totalCount
end
end
</source>