In fact this is Pseudo code.
In other languages you would use the .
to tell people that the method is in this class but in smalltalk you write >>
What you would do in a Smalltalk like Squeak or Pharo for
Point class>>x: xNumber y: yNumber
^self new
setX: xNumber
y: yNumber
- Open the System Browser
- klick on class, a button that will show you the class side of the class.
paste the method in the text area with the source code:
x: xNumber y: yNumber ^self new setX: xNumber y: yNumber
Strg-s to save the code
For
Point>>setX: xNumber y: yNumber
x := xNumber.
y := yNumber.
^self
You would do the same but not use the class side