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Julia v1.10 Release Notes

New language features

Language changes

  • When a task forks a child, the parent task's task-local RNG (random number generator) is no longer affected. The seeding of child based on the parent task also takes a more disciplined approach to collision resistance, using a design based on the SplitMix and DotMix splittable RNG schemes (#49110).

Compiler/Runtime improvements

  • The @pure macro is now deprecated. Use Base.@assume_effects :foldable instead (#48682).

Command-line option changes

Multi-threading changes

Build system changes

New library functions

  • tanpi is now defined. It computes tan(πx) more accurately than tan(pi*x) (#48575).
  • fourthroot(x) is now defined in Base.Math and can be used to compute the fourth root of x. It can also be accessed using the unicode character ∜, which can be typed by \fourthroot<tab> (#48899).

New library features

  • The initialized=true keyword assignment for sortperm! and partialsortperm! is now a no-op (#47979). It previously exposed unsafe behavior (#47977).
  • binomial(x, k) now supports non-integer x (#48124).
  • A CartesianIndex is now treated as a "scalar" for broadcasting (#47044).
  • printstyled now supports italic output (#45164).

Standard library changes

  • startswith now supports seekable IO streams (#43055)
  • printing integral Rationals will skip the denominator in Rational-typed IO context (e.g. in Arrays) (#45396)

Package Manager

  • "Package Extensions": support for loading a piece of code based on other packages being loaded in the Julia session. This has similar applications as the Requires.jl package but also supports precompilation and setting compatibility.
  • Pkg.precompile now accepts timing as a keyword argument which displays per package timing information for precompilation (e.g. Pkg.precompile(timing=true))

LinearAlgebra

  • AbstractQ no longer subtypes to AbstractMatrix. Moreover, adjoint(Q::AbstractQ) no longer wraps Q in an Adjoint type, but instead in an AdjointQ, that itself subtypes AbstractQ. This change accounts for the fact that typically AbstractQ instances behave like function-based, matrix-backed linear operators, and hence don't allow for efficient indexing. Also, many AbstractQ types can act on vectors/matrices of different size, acting like a matrix with context-dependent size. With this change, AbstractQ has a well-defined API that is described in detail in the Julia documentation (#46196).
  • Adjoints and transposes of Factorization objects are no longer wrapped in Adjoint and Transpose wrappers, respectively. Instead, they are wrapped in AdjointFactorization and TranposeFactorization types, which themselves subtype Factorization (#46874).
  • New functions hermitianpart and hermitianpart! for extracting the Hermitian (real symmetric) part of a matrix (#31836).
  • The norm of the adjoint or transpose of an AbstractMatrix now returns the norm of the parent matrix by default, matching the current behaviour for AbstractVectors (#49020).

Printf

  • Format specifiers now support dynamic width and precision, e.g. %*s and %*.*g (#40105).

Profile

Random

REPL

SuiteSparse

SparseArrays

Test

  • The @test_broken macro (or @test with broken=true) now complains if the test expression returns a non-boolean value in the same way as a non-broken test. (#47804)

Dates

Distributed

Unicode

DelimitedFiles

InteractiveUtils

  • code_native and @code_native now default to intel syntax instead of AT&T.

Deprecated or removed

External dependencies

Tooling Improvements