class and module order relation in ruby
September 29th, 2008 • Uncategorized
irb(main):001:0> class Stone irb(main):002:1> end => nil irb(main):003:0> irb(main):004:0* module Alive irb(main):005:1> # superset irb(main):006:1* end => nil irb(main):007:0> irb(main):008:0* class Reptile irb(main):009:1> # subset of alive creatures irb(main):010:1* include Alive irb(main):011:1> end => Reptile irb(main):012:0> irb(main):013:0* class Mammal irb(main):014:1> # subset of alive creatures irb(main):015:1* include Alive irb(main):016:1> end => Mammal irb(main):017:0> irb(main):018:0* class Dolphin < Mammal irb(main):019:1> # subset of alive creatures irb(main):020:1* end => nil irb(main):021:0> irb(main):022:0* Alive > Stone => nil irb(main):023:0> Alive > Reptile => true irb(main):024:0> Alive > Mammal => true irb(main):025:0> Alive > Dolphin => true irb(main):026:0> irb(main):027:0* Stone < Alive => nil irb(main):028:0> Reptile < Alive => true irb(main):029:0> Mammal < Alive => true irb(main):030:0> Dolphin < Alive => true irb(main):031:0> irb(main):032:0* Dolphin < Mammal => true irb(main):033:0> Mammal > Dolphin => true irb(main):034:0> irb(main):035:0* Dolphin > Mammal => false irb(main):036:0> Mammal < Dolphin => false irb(main):037:0> irb(main):038:0* Reptile > Mammal # unrelated creatures => nil irb(main):039:0> Reptile < Mammal # unrelated creatures => nil irb(main):040:0> Mammal < Reptile # unrelated creatures => nil irb(main):041:0> Mammal > Reptile # unrelated creatures => nil