Julia v1.7 Release Notes
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New language features
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* `count` and `findall` now accept an `AbstractChar` argument to search for a character in a string ([#38675]).
* An underscore `_` as a function argument, e.g. `f(_, y)`, is now shorthand
for the "curried" anonymous function `x -> f(x, y)` ([#24990]).
Language changes
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Compiler/Runtime improvements
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Command-line option changes
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Multi-threading changes
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Build system changes
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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 library features
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Standard library changes
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* `islowercase` and `isuppercase` are now compliant with the Unicode lower/uppercase categories ([#38574]).
#### Package Manager
#### LinearAlgebra
#### Markdown
#### Printf
#### Random
#### REPL
#### SparseArrays
#### Dates
#### Statistics
#### Sockets
#### Distributed
#### UUIDs
#### Mmap
Deprecated or removed
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External dependencies
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Tooling Improvements
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