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Month 1 · Week 2 — Exercises

Practice for composite types: slices, maps/sets, and strings/runes. Each folder is its own package with a solution and table-driven tests. Standard library only.

Exercise Concept Day Run tests
wordfreq/ maps, comma-ok, deterministic sort 011 go test ./wordfreq
dedup/ slices, map[T]struct{} set, generics 009–011 go test ./dedup
runereverse/ runes vs bytes, UTF-8 012 go test ./runereverse

How to use

  1. Try it yourself first — move the solution aside and re-implement from the prompt.
  2. Run go test ./... from this directory.
  3. Log any differences in your day note's "Mistakes" section.

Prompts

  • wordfreq: Count(text) map[string]int — case-insensitive, split on non-alphanumerics. Top(text, n) []string — n most frequent, ties broken alphabetically (deterministic).
  • dedup: Dedup[T comparable](s []T) []T — drop duplicates, keep first-seen order, do not mutate the input. Bonus: DedupInPlace reusing the backing array (s[:0]).
  • runereverse: Reverse(s string) string reversing by rune, not byte, so multi-byte characters survive. Bonus: IsPalindromeRunes, RuneCount.

Results

Exercise Status Tests
wordfreq ✅ pass
dedup ✅ pass
runereverse ✅ pass

Run all of Week 2 at once with go test ./....

⬅ Exercises