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| -rw-r--r-- | julia.html.markdown | 71 |
1 files changed, 28 insertions, 43 deletions
diff --git a/julia.html.markdown b/julia.html.markdown index d54e7d0e..e18fc3cd 100644 --- a/julia.html.markdown +++ b/julia.html.markdown @@ -397,61 +397,46 @@ filter(x -> x > 5, [3, 4, 5, 6, 7]) #=> [6, 7] [add_10(i) for i=[1, 2, 3]] #=> [11, 12, 13] [add_10(i) for i in [1, 2, 3]] #=> [11, 12, 13] -#### -#### In progress point -#### - #################################################### -## 5. Classes +## 5. Types and Multiple-Dispatch #################################################### -# We subclass from object to get a class. -class Human(object): - - # A class attribute. It is shared by all instances of this class - species = "H. sapiens" - - # Basic initializer - def __init__(self, name): - # Assign the argument to the instance's name attribute - self.name = name - - # An instance method. All methods take self as the first argument - def say(self, msg): - return "%s: %s" % (self.name, msg) - - # A class method is shared among all instances - # They are called with the calling class as the first argument - @classmethod - def get_species(cls): - return cls.species +# Type definition +type Tiger + taillength::Float64 + coatcolor # no type annotation is implicitly Any +end +# default constructor is the properties in order +# so, Tiger(taillength,coatcolor) - # A static method is called without a class or instance reference - @staticmethod - def grunt(): - return "*grunt*" +# Type instantiation +tigger = Tiger(3.5,"orange") # the type doubles as the constructor function +# Abtract Types +abstract Cat # just a name and point in the type hierarchy -# Instantiate a class -i = Human(name="Ian") -print i.say("hi") # prints out "Ian: hi" +# types defined with the type keyword are concrete types; they can be instantiated +# types defined with the abstract keyword are abstract types; they can have subtypes +# each type has one supertype; a supertype can have zero or more subtypes. -j = Human("Joel") -print j.say("hello") #prints out "Joel: hello" +type Lion <: Cat # Lion is a subtype of Cat + mane_color + roar::String +end -# Call our class method -i.get_species() #=> "H. sapiens" +type Panther <: Cat # Panther is also a subtype of Cat + eye_color + Panther() = new("green") # Panthers will only have this constructor, and no default constructor. +end -# Change the shared attribute -Human.species = "H. neanderthalensis" -i.get_species() #=> "H. neanderthalensis" -j.get_species() #=> "H. neanderthalensis" +#### +#### In progress point +#### -# Call the static method -Human.grunt() #=> "*grunt*" -``` +#### Multiple Dispatch ## Further Reading +#### Link to Maunual Still up for more? Try [Learn Python The Hard Way](http://learnpythonthehardway.org/book/) |