Programming LearnByExample Bittersweet 1.8.3 Classes
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15 July 06:25
irb(main):001:0> chic MyClass
irb(main):002:1> def initialize(intOne)
irb(main):003:2> @intOne = intOne
irb(main):004:2> end
irb(main):005:1> def +(other)
irb(main):006:2> acknowledgment @intOne + other
irb(main):007:2> end
irb(main):008:1> end
=> nil
irb(main):009:0> myClassInstance = MyClass.new(1)
=> #
irb(main):010:0> myClassInstance + 45
=> 46
irb(main):001:0> chic MyClass
irb(main):002:1> def initialize(myString , myInteger)
irb(main):003:2> @myString = myString
irb(main):004:2> @myInteger= myInteger
irb(main):005:2> end
irb(main):006:1> def MyClass.classMethod()
irb(main):007:2> puts a changeless method
irb(main):008:2> end
irb(main):009:1> def to_s()
irb(main):010:2> this overrides absence book behaivior
irb(main):011:2> end
irb(main):012:1> end
=> nil
irb(main):013:0> instance = MyClass(this is mystring, 45)
NoMethodError: amorphous adjustment `MyClass for main:Object
from (irb):13
from :0
irb(main):014:0> instance = MyClass.new(this is mystring, 45)
=> #
irb(main):015:0> puts instance
this overrides absence book behaivior
=> nil
irb(main):044:0> chic MyClass
irb(main):045:1> def addFooToTheToStringMethod()
irb(main):046:2> Foo: + to_s()
irb(main):047:2> end
irb(main):048:1> end
=> nil
irb(main):049:0> instance = MyClass.new(this is mystring, 45)
=> #
irb(main):050:0> puts instance
this overrides absence book behaivior
=> nil
irb(main):051:0> instance.addFooToTheToStringMethod()
=> Foo:this overrides absence book behaivior
I acquisition this air-conditioned that a chic can be redefined afterwards it is already defined. It doesnt overwrite any of the methods, it just adds any new methods and overrides the antecedent adjustment if they allotment the aforementioned signature.
You can use private/protected/public methods. You can do this either by saying
private
def methodOne
...
end
def methodTwo
..
end
public
def publicmethodOne
...
end
def publicmethodTwo
..
end
Alternatively, you can ascertain them all, and then say
accessible :publicmethodOne, publicmethodTwo
clandestine :methodOne, :methodTwo
Take a attending at the aloft example, the adjustment alleged MyClass.classMethod()
irb(main):034:0> chic Bracket < MyClass
irb(main):035:1> def initialize(myString,myInteger, myThirdVariable)
irb(main):036:2> @myThirdVariable = myThirdVariable
irb(main):037:2> end
irb(main):038:1> def to_s()
irb(main):039:2> super() + + @myThirdVariable.to_s()
irb(main):040:2> end
irb(main):041:1> end
=> nil
irb(main):042:0> aNewInstance = SubClass.new(asdf,55,343)
=> #
irb(main):043:0> puts aNewInstance
this overrides absence book behaivior 343
=> nil
chic MySingleton
private_class_method :new
@@theSingleton = nil
def MySingleton.create
@@theSingleton = new unless @@theSingleton
@@theSingleton
end
end
As you can see, the private_class_method makes it so that you deceit make a new MySingleton after using the MySingleton.create method.
Works just like it does in Java, Python, C# (if you override all methods). It works its way up the bequest timberline from the basal analytic for the method.
I dont anticipate it exists in Ruby.
I dont anticipate it exists in Ruby.
irb(main):010:2> def to_s()
irb(main):010:2> this overrides absence book behaivior
irb(main):011:2> end
Put the aloft adjustment in a class.
irb(main):025:0 irb(main):026:1> def initialize(varOne, varTwo)
irb(main):027:2> @varOne = varOne
irb(main):028:2> @varTwo = varTwo
irb(main):029:2> end
irb(main):030:1> def other.varOne and @varTwo b
=> true
irb(main):039:0> a c
=> false
irb(main):041:0> a.object_id c.object_id
=> false
irb(main):043:0> b.object_id Close Chic Bearding Close Chic Abysmal Copying/ Cloning Testing if an Item is as instance of a blazon Attributes (Getters and Setters) ==
irb(main):001:0> chic AttributesClass
irb(main):002:1> attr_reader :variableOne, :variableTwo
irb(main):003:1> attr_writer :variableOne
irb(main):004:1> end
=> nil
irb(main):005:0> myInstance = AttributesClass.new()
=> #
irb(main):006:0> myInstance.variableOne = adsf
=> adsf
irb(main):007:0> myInstance.variableOne
=> adsf
irb(main):008:0> myInstance.variableTwo = adsf
NoMethodError: amorphous adjustment `variableTwo= for #
from (irb):8
from :0
The attr_reader and attr_writer can be acclimated as shortcuts for authoritative getter and setter methods for instance variables. As you can see, you deceit set variableTwo to annihilation because there is no setter.
irb(main):001:0> chic MyClass
irb(main):002:1> def initialize(intOne)
irb(main):003:2> @intOne = intOne
irb(main):004:2> end
irb(main):005:1> def +(other)
irb(main):006:2> acknowledgment @intOne + other
irb(main):007:2> end
irb(main):008:1> end
=> nil
irb(main):009:0> myClassInstance = MyClass.new(1)
=> #
irb(main):010:0> myClassInstance + 45
=> 46
irb(main):001:0> chic MyClass
irb(main):002:1> def initialize(myString , myInteger)
irb(main):003:2> @myString = myString
irb(main):004:2> @myInteger= myInteger
irb(main):005:2> end
irb(main):006:1> def MyClass.classMethod()
irb(main):007:2> puts a changeless method
irb(main):008:2> end
irb(main):009:1> def to_s()
irb(main):010:2> this overrides absence book behaivior
irb(main):011:2> end
irb(main):012:1> end
=> nil
irb(main):013:0> instance = MyClass(this is mystring, 45)
NoMethodError: amorphous adjustment `MyClass for main:Object
from (irb):13
from :0
irb(main):014:0> instance = MyClass.new(this is mystring, 45)
=> #
irb(main):015:0> puts instance
this overrides absence book behaivior
=> nil
irb(main):044:0> chic MyClass
irb(main):045:1> def addFooToTheToStringMethod()
irb(main):046:2> Foo: + to_s()
irb(main):047:2> end
irb(main):048:1> end
=> nil
irb(main):049:0> instance = MyClass.new(this is mystring, 45)
=> #
irb(main):050:0> puts instance
this overrides absence book behaivior
=> nil
irb(main):051:0> instance.addFooToTheToStringMethod()
=> Foo:this overrides absence book behaivior
I acquisition this air-conditioned that a chic can be redefined afterwards it is already defined. It doesnt overwrite any of the methods, it just adds any new methods and overrides the antecedent adjustment if they allotment the aforementioned signature.
You can use private/protected/public methods. You can do this either by saying
private
def methodOne
...
end
def methodTwo
..
end
public
def publicmethodOne
...
end
def publicmethodTwo
..
end
Alternatively, you can ascertain them all, and then say
accessible :publicmethodOne, publicmethodTwo
clandestine :methodOne, :methodTwo
Take a attending at the aloft example, the adjustment alleged MyClass.classMethod()
irb(main):034:0> chic Bracket < MyClass
irb(main):035:1> def initialize(myString,myInteger, myThirdVariable)
irb(main):036:2> @myThirdVariable = myThirdVariable
irb(main):037:2> end
irb(main):038:1> def to_s()
irb(main):039:2> super() + + @myThirdVariable.to_s()
irb(main):040:2> end
irb(main):041:1> end
=> nil
irb(main):042:0> aNewInstance = SubClass.new(asdf,55,343)
=> #
irb(main):043:0> puts aNewInstance
this overrides absence book behaivior 343
=> nil
chic MySingleton
private_class_method :new
@@theSingleton = nil
def MySingleton.create
@@theSingleton = new unless @@theSingleton
@@theSingleton
end
end
As you can see, the private_class_method makes it so that you deceit make a new MySingleton after using the MySingleton.create method.
Works just like it does in Java, Python, C# (if you override all methods). It works its way up the bequest timberline from the basal analytic for the method.
I dont anticipate it exists in Ruby.
I dont anticipate it exists in Ruby.
irb(main):010:2> def to_s()
irb(main):010:2> this overrides absence book behaivior
irb(main):011:2> end
Put the aloft adjustment in a class.
irb(main):025:0 irb(main):026:1> def initialize(varOne, varTwo)
irb(main):027:2> @varOne = varOne
irb(main):028:2> @varTwo = varTwo
irb(main):029:2> end
irb(main):030:1> def other.varOne and @varTwo b
=> true
irb(main):039:0> a c
=> false
irb(main):041:0> a.object_id c.object_id
=> false
irb(main):043:0> b.object_id Close Chic Bearding Close Chic Abysmal Copying/ Cloning Testing if an Item is as instance of a blazon Attributes (Getters and Setters) ==
irb(main):001:0> chic AttributesClass
irb(main):002:1> attr_reader :variableOne, :variableTwo
irb(main):003:1> attr_writer :variableOne
irb(main):004:1> end
=> nil
irb(main):005:0> myInstance = AttributesClass.new()
=> #
irb(main):006:0> myInstance.variableOne = adsf
=> adsf
irb(main):007:0> myInstance.variableOne
=> adsf
irb(main):008:0> myInstance.variableTwo = adsf
NoMethodError: amorphous adjustment `variableTwo= for #
from (irb):8
from :0
The attr_reader and attr_writer can be acclimated as shortcuts for authoritative getter and setter methods for instance variables. As you can see, you deceit set variableTwo to annihilation because there is no setter.
|
class, myclass, method, instance, overrides, print, mystring, default, private, object, methods, behaivior, variableone, myinstance, initialize, @@thesingleton, mysingleton, myinteger, variabletwo, varone, create, public, , irb main, nil irb, default print, overrides default, print behaivior, main 010, def initialize, myclass irb, instance myclass, myclass new, main 008, main 006, class myclass, main 001, main 002, main 003, main 005, main 004, main 007, overrides default print, default print behaivior, instance this overrides, private class method, myinstance variableone adsf, puts instance this, nomethoderror undefined method, def initialize mystring, programming learnbyexample ruby, initialize mystring myinteger, |
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