# Standard Library Overview

This page provides a quick orientation to the standard library located under `./lib/`.

The stdlib is written in Fun and organized by domain. Below are top-level modules and what they generally cover. Refer to the source for full APIs and examples.

## Module index (selected)
- `crypt/` — cryptographic helpers (hashing, encoding helpers). See also `lib/crypt`.
- `encoding/` — text/binary encodings and conversions.
- `io/` — file and stream utilities.
- `net/` — basic networking helpers.
- `regex/` — regular expression utilities (PCRE2 when available).
- `ui/` — UI helpers (e.g., Tk if enabled at build time).
- `utils/` — small reusable helpers and utilities.

Note: Availability of some modules can depend on optional extensions selected at build time (see `docs/build.md`).

## Using modules
```fun
include "utils/strings.fun" as strings

let s = strings.trim("  hello  ")
print(s)
```

For search paths and namespacing details, see `docs/includes.md` and `docs/cli.md` (FUN_LIB_DIR and DEFAULT_LIB_DIR).