Module 08 · System Design · Low-level design: classes, properly
The object that keeps its own rules (encapsulation and invariants)
The Object That Keeps Its Rules · Open board
The open counter that goes below zero, the teller behind glass who refuses, and a thousand steps with and without the guard.
Before you start. You need the habit from Nouns and verbs (from requirements to classes): turning a spoken requirement into a list of classes and the job each one does. Here we open one of those classes and ask who is allowed to touch what is inside. You also need to read a little Python, and only a little. The one word to carry is class: a blueprint for objects, saying what each one remembers and what it can do.
Lesson 36 of 73 in System Design
The rest of this lesson is part of a plan.
A plan opens every lesson, board, video, lab and paper on chalk. Yearly is $39/year, or $19.50 for your first year with LAUNCH50, ends 1 Nov, 18:30 UTC.
