BAC-L1-SUB-102Substrate / Polkadot SDK
Rust II — traits, generics, error handling
The abstractions FRAME is built on end to end. Without them a pallet stays an unreadable wall of text.
- Level
- L1 — Blockchain developer
- Duration
- 4 h
- Maintainer
- Polkadot / Substrate Lead Architect
Learning objectives
- 01Define and implement a generic trait with associated types
- 02Model errors through the type system rather than exceptions
- 03Read a complex generic signature and infer its constraints
Guided lab
Design an abstract storage trait and supply two interchangeable implementations.
Independent lab
Replace all panic-based error handling in supplied code with typed propagation.
Security angle
Why a panic inside a runtime is not merely a bug but a chain halt.
Assessment
Interchangeable implementations passing one shared test suite.