The Fission Theory: This theory proposes that the Moon was once part of the Earth and somehow separated from the Earth early in the history of the solar system.
When you actually use that class to make a THING, this is what you make. A method is a bit of code that can be called when needed (often as part of an class, but not always) Here's an example: I write a class called Ball. In my main code, I then write a=Ball.new, b=Ball.new, c=Ball.new.
We touched a bit on this in a previous post Classes In Swift â An Introduction. To recap what was mentioned in that post, methods are functions that are associated with a type. In other words, all methods are functions, but not all functions are methods. Functions can be written outside of the context of a type, especially in playgrounds.