Julia v1.10 Release Notes

New language features

Language changes

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]).

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])

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]).

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