Daily DSA (JavaScript)

Practice data structures and algorithms in modern JavaScript (ES modules) with the built-in Node.js test runner—no Jest or Vitest required.

GitHub: https://github.com/GAjay/daily-dsa-javascript

Requirements

• Node.js 20+

Quick start

npm test

Run tests for one problem:

node --test problems/2026-10-11-two-sum/two-sum.test.js

Folder layout

Each day (or each problem) lives in its own folder under problems/:

problems/
  YYYY-MM-DD-slug/
    README.md      # problem statement, examples, constraints
    solution.js    # your implementation (exported functions)
    solution.test.js

Shared helpers (optional) go in lib/.

Add a new day

Scaffold an empty problem from a slug:

npm run new-day -- binary-search
# creates problems/2026-10-11-binary-search/

Then edit README.md, implement solution.js, and run npm test.

Workflow tips

1. Read README.md in the problem folder.
2. Implement exports in solution.js (see the starter twoSum example).
3. Run npm test until green.
4. Commit with a message like dsa: 2026-10-11 two sum.

Automation (daily scaffold + Cursor)

Start here: automation/SETUP.md — GitHub Actions + Cursor Automation prompt template + Cloud Environment.

See also automation/README.md.

npm run daily              # today's problem from catalog (idempotent)
npm run daily -- --dry-run # preview next slug

GitHub: .github/workflows/daily-dsa.yml runs on a cron (06:00 UTC) and commits the new folder + automation/state.json. .github/workflows/ci.yml runs npm run test:ci (only implemented solutions—scaffolds do not fail CI).

1. Create/link your GitHub repo and push main.
2. Enable Actions → run Daily DSA once manually to verify.
3. Implement each day's solution.js; use npm test locally (all problems, including drafts).

License

MIT