# Page Not Found

The URL `files/R1NJiU6WkBJTxFwydqpc` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [CHAPTER 2. Diving into TypeScript](https://incheol-jung.gitbook.io/docs/study/reference/2017-01-22-diving-into-typescript.md)
- [CHAPTER 12. Testing your app](https://incheol-jung.gitbook.io/docs/study/reference/2017-01-22-testing-your-app.md)
- [Chap 02. 컬렉션의 사용](https://incheol-jung.gitbook.io/docs/study/functional-programming-in-java-8/untitled-2.md)
- [Chap 03. String, Comparator, 그리고 filter](https://incheol-jung.gitbook.io/docs/study/functional-programming-in-java-8/untitled-1.md)
- [Chap 01. 헬로, 람다 표현식](https://incheol-jung.gitbook.io/docs/study/functional-programming-in-java-8/untitled.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://incheol-jung.gitbook.io/docs/study/reference/2017-01-22-diving-into-typescript.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://incheol-jung.gitbook.io/docs/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://incheol-jung.gitbook.io/docs/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/docs/study/reference/2017-01-22-diving-into-typescript.md`).

You may also use `Accept: text/markdown` header for content negotiation.