Zack Youngren
Zack Youngren's work was selected for the XERJ Corpus Hub, the open reference memory AI coding agents search before they write code. When an agent meets the same problem, it gets this implementation back as a worked example, with the author and the repository attached.
Totals across every corpus @zack appears in; a commit selected for two corpora counts once. Files and lines count the selected commits; each corpus indexes the whole repository at its pinned commit.
What an agent can do with the citibike corpus
zack/citibike: a website for seeing data of nyc's citibike stations
- Reuse a worked example: the commit “date range select” (4 files · TypeScript).
- Answer from citibike's real TypeScript source instead of memory (Web and frontend platform).
- Where does citibike handle “date range select”?
- What does app do in citibike?
Search the GitHub repository zack/citibike with XERJ (https://hub.xerj.org/corpus/zack--citibike). Run these in a shell, in order, and check each result before the next: 1. xerj --help (success: it prints usage). If xerj is missing: curl -fsSL https://xerj.org/get | sh 2. git clone https://github.com/zack/citibike citibike && git -C citibike checkout cf2c4a18a09d5cc706353d29ed70b9bed5b1929d 3. Start a local node and leave it running: xerj --insecure --data-dir ./xerj-data 4. xerj autoindex ./citibike --url http://127.0.0.1:9200 --prefix citibike --progress plain 5. xerj autoindex map --url http://127.0.0.1:9200 Then answer my question from the indexed files and cite the ax_path of every hit. Query syntax: https://xerj.org/llms.txt Licence: AGPL-3.0. Read it for the approach only, do not copy code.
corpus zack--citibike · Web and frontend platform
Related corpora: minify, astro, carbon, postcss
Case study: reference coding for agents
Selected work
zack/citibike
The corpus is the whole repository at the pinned commit, not only the files of the selected commit.
Not installable yet: this corpus is not in the hub registry until its licence review passes, so xerj corpus add and xerj ask cannot fetch it. It becomes installable when this card says live in the hub.
Sign in with GitHub or Hugging Face to see more: every selected commit in full (commit date, every folder, licence review state, pin) and the pack builds of each corpus.
[](https://hub.xerj.org/contributors/zack)
Included with the author's permission (email, 2026-10-22), under each repository's own licence, with attribution. Want it removed? Reply to the email or open an issue on xerj-org/xerj.