Also you can make methods in class static so no need for self. However, use this if you really need that. Yours: class bla: def hello(self): self.thing() def thing(self): print “hello” static edition: class bla: @staticmethod def hello(): bla.thing() @staticmethod def thing(): print “hello”
Yes, you can do this. Note, however, that the block will retain self. If you end up storing this block in an ivar, you could easily create a retain cycle, which means neither would ever get deallocated. To get around this, you can do: – (void) someMethodWithAParameter:(id)aParameter { __block MySelfType *blocksafeSelf = self; void (^tempFunction)(void) … Read more
The same way self is used to access an attribute inside the object (class) itself. Not inside the object / class, just inside the class’ instance methods. self is just a convention, you could call it whatever you wanted, even something different in each method. So if you didn’t prefix a variable with self in … Read more
Self refers to the type of the current “thing” inside of a protocol (whatever is conforming to the protocol). For an example of its use, see Protocol func returning Self. The official docs I’ve found for Self is in Protocol Associated Type Declaration in The Swift Programming Language. It surprisingly is not documented in the … Read more
When you’re doing an action on the instance that’s calling the method, you use self. With this code class SocialData < ActiveRecord::Base def set_active_flag(val) active_flag = val save! end end You are defining a brand new scoped local variable called active_flag, setting it to the passed in value, it’s not associated with anything, so it’s … Read more
First of all, let me correct you – self is not a method. Moving further: Technically both self and this are used for the same thing. They are used to access the variable associated with the current instance. Only difference is, you have to include self explicitly as first parameter to an instance method in … Read more
Short answer:{Binding} is not a shortcut for “binding to itself” (in the sense of RelativeSource.Self). Rather, {Binding} is equivalent to {Binding Path=.}, which binds to the current source. To elaborate: A binding has a source and a path. You can do a “binding to itself”, for example, by using <myUIControl myProperty=”{Binding RelativeSource={RelativeSource Self}, Path=x}” /> … Read more
self points to the class in which it is written. So, if your getInstance method is in a class name MyClass, the following line : self::$_instance = new self(); Will do the same as : self::$_instance = new MyClass(); Edit : a bit more information, after the comments. If you have two classes that extend … Read more
In Java terms: Python doesn’t have member functions, all class functions are static, and are called with a reference to the actual class instance as first argument when invoked as member function. This means that when your code has a class MyClass and you build an instance m = MyClass(), calling m.do_something() will be executed … Read more
Writing @age directly accesses the instance variable @age. Writing self.age tells the object to send itself the message age, which will usually return the instance variable @age — but could do any number of other things depending on how the age method is implemented in a given subclass. For example, you might have a MiddleAgedSocialite … Read more