Julia v1.7 Release Notes

New language features

Language changes

Compiler/Runtime improvements

Command-line option changes

Multi-threading changes

If the JULIA_NUM_THREADS environment variable is set to auto, then the number of threads will be set to the number of CPU threads ([#38952])

Build system changes

New library functions

Two argument methods findmax(f, domain), argmax(f, domain) and the corresponding min versions ([#27613]).
isunordered(x) returns true if x is value that is normally unordered, such as NaN or missing.
New macro Base.@invokelatest f(args...; kwargs...) provides a convenient way to call Base.invokelatest(f, args...; kwargs...) ([#37971])
New macro Base.@invoke f(arg1::T1, arg2::T2; kwargs...) provides an easier syntax to call invoke(f, Tuple{T1,T2}; kwargs...) ([#38438])

New library features

Standard library changes

count and findall now accept an AbstractChar argument to search for a character in a string ([#38675]).
range now supports start as an optional keyword argument ([#38041]).
islowercase and isuppercase are now compliant with the Unicode lower/uppercase categories ([#38574]).
iseven and isodd functions now support non-Integer numeric types ([#38976]).
escape_string can now receive a collection of characters in the keyword keep that are to be kept as they are. ([#38597]).

Package Manager

LinearAlgebra

Markdown

Printf

Random

REPL

SparseArrays

Dates

The Dates.periods function can be used to get the Vector of Periods that comprise a CompoundPeriod ([#39169]).

Statistics

Sockets

Distributed

UUIDs

Mmap

Deprecated or removed

External dependencies

Tooling Improvements