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Day 056 — Month 2 Review + Tag v0.2.0

Month 2 · Week 4 · ⬅ Day 055 · Day 057 ➡ · Journal index

🎯 Learning Objective

Close out Month 2: consolidate the tooling/testing toolkit with closed-book recall, write the Week 4 and Month 2 reviews, and cut the v0.2.0 release tag.

📚 Topics

  • Spaced-repetition recall over Weeks 1–4 (stdlib, encoding/http/context, testing, tooling)
  • Writing the formal week + month reviews
  • Tagging a release with annotated git tag

📖 Reading / Sources

📝 Notes

  • Light day by design: the deep content lives in the two review docs. → Week 4 review · Month 2 review.
  • Week 4 in one line: the engineering around the code — go vet/golangci-lint, a Makefile gate, build tags & cross-compilation, pprof, GitHub Actions CI, and a stdlib URL-shortener capstone.
  • Month 2 in one line: the standard library became a working toolbox (I/O, fmt, strings, encoding, time, http, context, slog), proven with the testing package and shipped behind reproducible tooling/CI.
  • Release ritual: ensure main is green in CI, update CHANGELOG.md, then git tag -a v0.2.0 -m "Month 2: Standard Library, Tooling & Testing" and git push --tags. → links to [[github-actions]] and [[tooling]].
  • Carry-forward weak spots into Month 3 spaced repetition: flat vs cum in pprof, build-constraint exhaustiveness, and the gofmt -l CI gate gotcha.

💻 Code Examples

# Cut the Month 2 release once CI is green on main.
git tag -a v0.2.0 -m "Month 2: Standard Library, Tooling & Testing"
git push origin v0.2.0
git describe --tags   # -> v0.2.0  (feeds -ldflags -X main.version)

No new runnable example today — this day is review + release. See examples/month-02/ for the month's programs.

🏋️ Exercises / Practice

Exercise Status Link
Closed-book recall of Weeks 1–4 (see week review re-quiz) ✅ journal/month-02/week-4-review.md
Re-run make ci across all Month 2 exercises ✅ exercises/month-02

🐛 Mistakes Made

  • Almost cut a lightweight tag (git tag v0.2.0) — used -a for an annotated tag so it carries a message, author, and date (the right kind for releases).

❓ Open Questions

  • Month 3 will lean on third-party libs and real services — how do I keep the examples compiling in this single-module repo? (Likely a separate module per service; decide in the Month 3 kickoff.)

🧠 Active Recall (answer without looking)

  1. Q: Which Month 2 tools form the local "gate," and which enforces it for everyone?
    A

Local gate: gofmt/goimports, go vet, golangci-lint, go test -race, go build — wrapped in a Makefile ci target. GitHub Actions runs the same steps on every push/PR to enforce it across contributors. 2. Q: What does tagging v0.2.0 signify here, and why annotated?

A

It marks Month 2 complete (SemVer minor bump from v0.1.0). An annotated tag (git tag -a) stores a message/author/date and is the conventional choice for releases, unlike a lightweight tag which is just a pointer.

🪶 Feynman Reflection

Month 2 was about everything that surrounds working code: how to read it with the standard library, how to prove it works with tests, and how to keep it honest with linters, a Makefile, and CI — then stamp the whole thing as a release. The capstone shortener tied it together: real stdlib HTTP, race-safe state, and a green pipeline.

🕳️ Knowledge Gaps

  • Release automation (goreleaser-style) and changelog generation — manual for now; revisit if the repo grows binaries.

✅ Summary

Month 2 is complete: I can navigate the standard library, test/benchmark/fuzz it, and ship it behind vet/lint/make/CI — captured in the week + month reviews and tagged v0.2.0.

⏭️ Next Steps / Prep for Tomorrow

  • Month 3 kickoff (Day 057): deeper concurrency and real services. Skim the roadmap and set up the Month 3 journal folder.
Time spent Difficulty Confidence
90 min 🟦⬜⬜⬜⬜ 🟦🟦🟦🟦⬜

Suggested commit: docs(journal): month 2 review + recall (day 056) then git tag -a v0.2.0 -m "Month 2 complete"