folio
One subject, one A4 page, as dense as it gets.
Each folio is a memo for remembering a subject: the important facts, and the pictures that carry them, packed onto a single printable A4 sheet. No filler, no narrative, nothing to skip. Read it here, or print it — every folio also comes as a one-page PDF.
- Dense — every line is a fact worth keeping.
- Visual — a diagram wherever a picture says it better than words.
- Linked — folios are tagged and point to related folios, so a subject connects to its neighbours.
A folio is not interview preparation, not a tutorial and not a blog post. It is the sheet you keep next to you.
The folios
1 sheets
design
- VIP · RIBs · MVI · Redux · MV — the architecture map
Every iOS architecture answers three questions: who owns the state, which way does data flow, and where do side effects live. VIP (Clean Swift) makes each screen a one-way cycle of three objects; RIBs (Uber) drive the app by a tree of business logic, not of views; MVI and Redux keep one immutable state changed only by a reducer; TCA is Redux made composable; MV says SwiftUI views plus @Observable models are already enough.