Practice · SOLID

Drill the design judgment

Ten cards, two per principle. Each one shows code or a scenario that violates the principle in a recognizable shape. Form your read, then reveal the breakdown.

Card 1

SRP — Spot the responsibilities in this controller

Card 2

OCP — Adding a third payment type

Card 3

LSP — Why this subclass breaks callers

Card 4

ISP — Cost of including a big concern everywhere

Card 5

DIP — Why is this class hard to test?

Card 6

SRP — Where does this query belong?

Card 7

OCP — Adding a status touches how many files?

Card 8

LSP — Two exporters with different shapes

Card 9

ISP — Why does this method take a whole User?

Card 10

DIP — Why is the test flaky at midnight?

Want the theory? The full 19-lesson SOLID series lives at SOLID, with several lessons per principle anchored in real OSS Rails code.

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