Julia v1.5 Release Notes

New language features

Language changes

Converting arbitrary tuples to NTuple, e.g. convert(NTuple, (1, "")) now gives an error, where it used to be incorrectly allowed. This is because NTuple refers only to homogeneous tuples (this meaning has not changed) ([#34272]).
In docstrings, a level-1 markdown header "Extended help" is now interpreted as a marker dividing "brief help" from "extended help." The REPL help mode only shows the brief help (the content before the "Extended help" header) by default; prepend the expression with '?' (in addition to the one that enters the help mode) to see the full docstring. ([#25930])

Multi-threading changes

Build system changes

New library functions

The new isdisjoint function indicates whether two collections are disjoint ([#34427]).

New library features

Function composition now works also on one argument ∘(f) = f (#34251)

Standard library changes

The @timed macro now returns a NamedTuple ([#34149])

LinearAlgebra

The BLAS submodule now supports the level-2 BLAS subroutine hpmv! ([#34211]).
normalize now supports multidimensional arrays ([#34239])
lq factorizations can now be used to compute the minimum-norm solution to under-determined systems ([#34350]).

Markdown

Random

REPL

SparseArrays

lu! accepts UmfpackLU as an argument to make use of its symbolic factorization.

Dates

Statistics

Sockets

Deprecated or removed

External dependencies

Tooling Improvements