How should I interpret the notation { ...: ...}? An example:
Class {
#name : #DemoCases,
#superclass : #Object,
#category : #'Demo-Core-Cases-OLD'
}
{ #category : #accessing }
DemoCases >> recursiveBlock [
| block |
block := [ block ].
^ block
]Does this represent a dictionary? The Pharo Cheat Sheet didn't mention this notation anywhere. Can I use it inside method bodies or Playground?
That isn't syntax belonging to Pharo itself. You're looking at the "tonel" code storage format. It combines code with pieces of STON (Smalltalk Object Notation, roughly Pharo's equivalent of JSON).
And it cannot go straight into Playground, you must import it with suitable tooling (Iceberg or Monticello, for example).
For some further background reading on Tonel's file format, consult its specification (https://github.com/GemTalk/TonelSpec). The format was created to improve git integration. Earlier Smalltalk environments used other systems for version control, among them Monticello dvcs, which delayed the move toward git.
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