Julia v1.2 Release Notes

New language features

Argument splatting (x...) can now be used in calls to the new pseudo-function in constructors ([#30577]).

Multi-threading changes

The Condition type now has a thread-safe replacement, accessed as Threads.Condition. With that addition, task scheduling primitives such as ReentrantLock are now thread-safe (#30061).

Language changes

Enum now behaves like a scalar when used in broadcasting ([#30670]).

Command-line option changes

New library functions

getipaddrs() function returns all the IP addresses of the local machine (#30349)

Standard library changes

The extrema function now accepts a function argument in the same manner as minimum and maximum (#30323).

LinearAlgebra

Added keyword arguments rtol, atol to pinv and nullspace (#29998).
UniformScaling instances are now callable such that e.g. I(3) will produce a Diagonal matrix ([#30298]).

SparseArrays

performance improvements for sparse matrix-matrix multiplication ([#30372]).
Sparse vector outer products are more performant and maintain sparsity in products of the form kron(u, v'), u * v', and u .* v' where u and v are sparse vectors or column views. ([#24980])

Dates

Fixed repr such that it displays DateTime as it would be entered in Julia (#30200).

Miscellaneous

Since environment variables on Windows are case-insensitive, ENV now converts its keys to uppercase for display, iteration, and copying ([#30593]).

External dependencies

libgit2 has been updated to v0.27.7 ([#30584]).
OpenBLAS has been updated to v0.3.5 ([#30583]).
MbedTLS has been updated to v2.16.0 ([#30618]).

Deprecated or removed