BAC-L1-COSMOS-101Cosmos SDK
Go I — types, interfaces, errors
The language most modern blockchain infrastructure is written in, approached through what sets it apart: enforced simplicity and errors as values.
- Level
- L1 — Blockchain developer
- Duration
- 4 h
- Track
- Cosmos SDK
- Maintainer
- Cosmos Lead Architect
Learning objectives
- 01Structure a Go program into coherent packages
- 02Design a minimal interface and implement it
- 03Handle errors as values, without swallowing them
Guided lab
Write an in-memory account registry with a storage interface and explicit error handling.
Independent lab
Add a second, persistent storage implementation without touching the calling code.
Security angle
An ignored error in Go is a deferred incident: hunt unchecked returns with tooling.
Assessment
Working registry with tests and a clean static-analysis run.