Functions are defined with the func keyword. They are the basis for methods.
func <name> (<arguments>){<code>}
Lambda functions are anonymous functions and have no name.
lambda <arguments> {<code>}
Methods are acutally functions at the base level, but are diffrentiated by the use of the method, staticmethod, and classmethod types to extend functionality. There is no way to define a method, as there is to define a function.
Methods are functions, and it is convention for the self parameter to represent the instance.
func <name> (self, <arguments>){<code>}
Staticmethods are methods that take no instance arguments.
@staticmethod
func <name> (<arguments>){<code>}
Classmethods are methods that take an instance argument in the form of the type (class) of the instance. It is convention to call this parameter cls.
@classmethod
func <name> (cls, <arguments>){<code>}
Generators are any functions witha yield statement.