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Julia v1.11 Release Notes

New language features

  • public is a new keyword. Symbols marked with public are considered public API. Symbols marked with export are now also treated as public API. The difference between public and export is that public names do not become available when using a package/module ([#50105]).
  • ScopedValue implement dynamic scope with inheritance across tasks ([#50958]).
  • The new macro Base.Cartesian.@ncallkw is analogous to Base.Cartesian.@ncall, but allows to add keyword arguments to the function call ([#51501]).
  • Support for Unicode 15.1 ([#51799]).
  • A new AbstractString type, AnnotatedString, is introduced that allows for regional annotations to be attached to an underlying string. This type is particularly useful for holding styling information, and is used extensively in the new StyledStrings standard library. There is also a new AnnotatedChar type, that is the equivalent new AbstractChar type.

Language changes

Compiler/Runtime improvements

  • Updated GC heuristics to count allocated pages instead of individual objects ([#50144]).
  • A new LazyLibrary type is exported from Libdl for use in building chained lazy library loads, primarily to be used within JLLs ([#50074]).

Command-line option changes

  • The entry point for Julia has been standardized to Main.main(ARGS). This must be explicitly opted into using the @main macro (see the docstring for further details). When opted-in, and julia is invoked to run a script or expression (i.e. using julia script.jl or julia -e expr), julia will subsequently run the Main.main function automatically. This is intended to unify script and compilation workflows, where code loading may happen in the compiler and execution of Main.main may happen in the resulting executable. For interactive use, there is no semantic difference between defining a main function and executing the code directly at the end of the script ([50974]).

Multi-threading changes

Build system changes

New library functions

  • The new Libc.mkfifo function wraps the mkfifo C function on Unix platforms ([#34587]).
  • hardlink(src, dst) can be used to create hard links ([#41639]).
  • diskstat(path=pwd()) can be used to return statistics about the disk ([#42248]).
  • copyuntil(out, io, delim) and copyline(out, io) copy data into an out::IO stream ([#48273]).
  • eachrsplit(string, pattern) iterates split substrings right to left.
  • Sys.username() can be used to return the current user's username ([#51897]).

New library features

  • replace(string, pattern...) now supports an optional IO argument to write the output to a stream rather than returning a string ([#48625]).
  • sizehint!(s, n) now supports an optional shrink argument to disable shrinking ([#51929]).

Standard library changes

StyledStrings

  • A new standard library for handling styling in a more comprehensive and structured way ([#49586]).
  • The new Faces struct serves as a container for text styling information (think typeface, as well as color and decoration), and comes with a framework to provide a convenient, extensible (via addface!), and customisable (with a user's Faces.toml and loadfaces!) approach to styled content ([#49586]).
  • The new @styled_str string macro provides a convenient way of creating a AnnotatedString with various faces or other attributes applied ([#49586]).

Package Manager

LinearAlgebra

Printf

Profile

Random

  • rand now supports sampling over Tuple types ([#35856], [#50251]).
  • rand now supports sampling over Pair types ([#28705]).
  • When seeding RNGs provided by Random, negative integer seeds can now be used ([#51416]).
  • Seedable random number generators from Random can now be seeded by a string, e.g. seed!(rng, "a random seed") ([#51527]).

REPL

  • Tab complete hints now show in lighter text while typing in the repl. To disable set Base.active_repl.options.hint_tab_completes = false ([#51229]).
  • Meta-M with an empty prompt now returns the contextual module of the REPL to Main.

SuiteSparse

SparseArrays

Test

Dates

Statistics

  • Statistics is now an upgradeable standard library ([#46501]).

Distributed

  • pmap now defaults to using a CachingPool ([#33892]).

Unicode

DelimitedFiles

InteractiveUtils

Deprecated or removed

External dependencies

  • tput is no longer called to check terminal capabilities, it has been replaced with a pure-Julia terminfo parser ([#50797]).

Tooling Improvements

  • CI now performs limited automatic typo detection on all PRs. If you merge a PR with a failing typo CI check, then the reported typos will be automatically ignored in future CI runs on PRs that edit those same files ([#51704]).