Standard Library

Standard Library

import Std.Text as Text
import Std.Option {map, unwrapOr}

Status: 46 source modules and 1291 exported declarations on the current dev branch. They ship with the compiler, resolve without a network, and are written in Pudu.

The count is a source declaration count, not a compatibility promise. Pudu is pre-release.

Modules

Core data and values

Module	Export declarations	Focus
Std.Bits	29	Width-aware bit operations and Bits.
Std.Bool	10	Boolean combinators and folds.
Std.Char	29	Character classification, case, and scalar conversion.
Std.Decimal	30	Exact decimal arithmetic, scale, conversion, and rounding.
Std.Function	14	Identity, composition, flipping, and bounded repetition.
Std.Math	27	Generic arithmetic, powers, roots, primality, and ordering helpers.
Std.Num	15	Numeric traits and generic operations.
Std.Option	24	Option transforms, collection, defaults, and Result bridges.
Std.Order	27	Ordering values, Eq, Ord, and derived comparisons.
Std.Result	24	Success/error transforms, collection, recovery, and defaults.
Std.Show	12	Value rendering, containers, padding, and tables.
Std.Tuple	10	Projection, swapping, mapping, currying, and uncurrying.

Collections

Module	Export declarations	Focus
Std.List	97	Array folds, searches, transforms, ordering, products, and windows.
Std.Map	47	Lookup, transforms, merges, groups, sets of keys, and inversion.
Std.Set	39	Membership, algebra, relations, filters, partitions, and products.
Std.Iter	25	Sequence, ranges, adapters, and consumers.
Std.NonEmpty	29	Sequences that carry non-emptiness in their shape.
Std.Deque	21	Double-ended persistent queue operations.
Std.Heap	18	Heap construction and least-element operations.
Std.Graph	22	Directed graphs, cycles, components, ordering, and paths.
Std.Tree	40	One value with a sequence of trees beneath it, and the walks over that shape.
Std.Mappable	3	A trait over the container itself, written with a parameter of higher kind.

Keyed structures

Std.Map answers what is under an exact key. These answer the questions it cannot.

Module	Export declarations	Focus
Std.SortedMap	31	Nearest-key questions: floor, ceiling, lower, higher, ranges, and a caller-supplied comparison.
Std.LinkedMap	27	Entries in the order they were inserted, with touch for recency.
Std.EnumMap	22	A fixed domain where every key has a value, so get answers V rather than Option[V].
Std.BiMap	24	A bijection, readable from either side.
Std.MultiMap	30	Many values under one key, where a key with none is absent.
Std.MultiKeyMap	24	A partial index: entries reachable by any of several keys.
Std.LruCache	22	A bounded map that discards by least recent use, so reading keeps an entry alive.
Std.PrefixTrie	25	Text keys held as paths through their characters, walked by prefix and in key order.

Text and formats

Module	Export declarations	Focus
Std.Text	64	Unicode text transforms, splits, searches, folds, and case.
Std.Text.Parse	69	Parser combinators, controlled backtracking, positions, and common tokens.
Std.Json	19	JSON values, positional decoding errors, and encoding.
Std.Url	16	URL parse/render, queries, percent encoding, and default ports.
Std.Http	99	HTTP data, headers, cookies, auth, negotiation, forms, and ranges.
Std.Http.Message	11	HTTP request/response wire parsing and rendering.

Output and formatting

Module	Export declarations	Focus
Std.Out	22	A printer as a value: separator, ending, prefix, and stream, with a pure rendered.
Std.Fmt	25	A shaping spec as a value: width, fill, alignment, sign, grouping, radix, and columns. No format strings.

Testing

Module	Export declarations	Focus
Std.Test	43	Checks and suites as values, tables, conditions, and a report that says what failed.
Std.Test.Property	8	Generated values with shrinking, seeded so a failure repeats exactly.

System and time

Module	Export declarations	Focus
Std.Io	28	Files, directories, standard streams, and paths.
Std.Env	17	Arguments, environment, platform paths, and exit.
Std.Process	11	Process execution, availability, status, and captured streams.
Std.Time	40	Instants, durations, dates, times, formatting, and parsing.
Std.Random	14	Reproducible generators, ranges, shuffle, sample, and identifiers.
Std.Crypto	8	SHA-256, UTF-8, and constant-time comparison.

Methods versus module functions

Built-in methods come from compiler-owned closed sets on Array, Str, Map, Set, and Char, plus methods supplied by program impl blocks. Other standard-library operations are module functions whose first argument is the value.

text.length()
Option.unwrapOr(value, fallback)

This rule is mechanical. E3033 explains a common wrong-side lookup.

Effect boundary

Effects use prelude operations and standard wrappers for files, environment, clock, processes, and console IO. They return recoverable carriers where the operation can fail. Compile-time evaluation denies these effects.

Source

The complete signatures and implementations are under lib/Std. Use pudu doc, pudu doc --json, or pudu doc --html to generate an index for the exact program graph you are working with.

Related

• Numbers And Collections
• Sets Maps And Sequences
• Keyed Structures
• Trees And Hierarchies
• Output Formatting And Testing
• Failure And Propagation
• CLI REPL And Documentation