Julia v1.7 Release Notes
========================

New language features
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* `(; a, b) = x` can now be used to destructure properties `a` and `b` of `x`. This syntax is equivalent to `a = getproperty(x, :a)`
  and similarly for `b`. ([#39285])

Language changes
----------------


Compiler/Runtime improvements
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Command-line option changes
---------------------------


Multi-threading changes
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* 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
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* 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]).
* `getindex` can now be used on `NamedTuple`s with multiple values ([#38878])
* `keys(::RegexMatch)` is now defined to return the capture's keys, by name if named, or by index if not ([#37299]).
* `RegexMatch` now iterate to give their captures. ([#34355]).

#### Package Manager


#### LinearAlgebra


#### Markdown


#### Printf


#### Random


#### REPL


#### SparseArrays


#### Dates

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

#### Statistics


#### Sockets


#### Distributed


#### UUIDs


#### Mmap


Deprecated or removed
---------------------


External dependencies
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Tooling Improvements
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