Stdlib Index

Every module that ships with AILANG, grouped by what it's for. Pure modules can be imported anywhere; capability modules need their capability passed via --caps at run time.

ailang run --caps IO,Net,Clock examples/runnable/myprogram.ail

See Effects for how the capability system works, Modules for import syntax, and Browse Packages for third-party modules published to the registry.

Data & Collections

Module	Purpose	Capability
std/list	Functional list operations: map, filter, fold, take, drop	—
std/array	O(1) indexed arrays (vs lists, which are O(n) indexed)	—
std/map	O(1) key-value lookup backed by Go hashmaps	—
std/string	Length, substring, trim, split, replace, case	—
std/bytes	UTF-8 encoding, base64, byte-level operations	—
std/iter	FoldStep and bounded folds for early exit	—

Algebraic Data Types

Module	Purpose	Capability
std/option	Some(x) / None for values that may not exist	—
std/result	Ok(x) / Err(e) for operations that can fail	—

Numerics & Randomness

Module	Purpose	Capability
std/math	Trigonometric, exponential, logarithmic, rounding	—
std/rand	Random integers, floats, booleans (seeded)	Rand

Time

Module	Purpose	Capability
std/datetime	Pure date/time math (parsing, formatting, arithmetic)	—
std/clock	Wall-clock time and sleep; deterministic mode supported	Clock
std/game	Frame timing for game loops: delta time, FPS	Clock

Encoding & Serialization

Module	Purpose	Capability
std/json	JSON encode/decode	—
std/xml	Parse XML strings into XmlNode trees, query elements	—
std/gzip	Gzip compress/decompress (base64-encoded I/O)	—
std/zip	Read/write ZIP archives (including .docx, .xlsx, .epub)	—
std/tar	Read entries from uncompressed tar archives	—
std/jwt	Parse and verify JSON Web Tokens	—
std/crypto	Hash, HMAC, symmetric/asymmetric primitives	—

I/O

Module	Purpose	Capability
std/io	Print to stdout, read from stdin, exit codes, raw bytes	IO
std/fs	Read/write files; sandboxed via AILANG_FS_SANDBOX	FS
std/env	Environment variable access (snapshot, allowlist, redaction)	Env
std/process	Execute external commands; allowlist + timeout + size limits	Process

Network

Module	Purpose	Capability
std/net	HTTP GET/POST; HTTPS by default, DNS rebinding prevention	Net
std/stream	WebSocket (bidirectional), SSE (server-sent events)	Stream

AI & Semantic

Module	Purpose	Capability
std/ai	General-purpose AI oracle: string -> string, JSON variants	AI
std/embedding	Compute embedding vectors via host-provided model	varies by host
std/sem	Semantic frame caching primitives	Clock, SharedMem
std/sharedmem	Key-value shared memory (effect wrappers for caching)	SharedMem
std/sharedindex	Namespace-partitioned similarity search index	SharedIndex
std/simhash	SimHash fingerprints for near-duplicate detection	—

Tracing & Debug

Module	Purpose	Capability
std/debug	Structured tracing and assertions; erased in --release mode	Debug (ghost)
std/trace	Emit custom spans and events into the trace pipeline	Trace
std/trace_test	Test helpers for trace-based assertions	Trace

---

Importing modules

module myapp

import std/io (println)
import std/list (map, filter)
import std/result (Result, Ok, Err)

export func main() -> unit ! {IO} {
  let xs = [1, 2, 3, 4, 5]
  let evens = filter(\x. x % 2 == 0, xs)
  println("evens: ${evens}")
}

Run with: ailang run --caps IO myapp.ail

See also

• Effects — how the capability system works
• Modules — import syntax, module, export func
• Browse Packages — third-party modules published to the registry
• Language Syntax — full reference