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Merge remote-tracking branch 'origin/master' into lazy-trees

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Eelco Dolstra 2022-08-25 17:41:12 +02:00
commit 13c0db4d06
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- [CLI guideline](contributing/cli-guideline.md)
- [Release Notes](release-notes/release-notes.md)
- [Release X.Y (202?-??-??)](release-notes/rl-next.md)
- [Release 2.11 (2022-08-25)](release-notes/rl-2.11.md)
- [Release 2.10 (2022-07-11)](release-notes/rl-2.10.md)
- [Release 2.9 (2022-05-30)](release-notes/rl-2.9.md)
- [Release 2.8 (2022-04-19)](release-notes/rl-2.8.md)

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# Nix Language
The Nix language is a pure, lazy, functional language. Purity
means that operations in the language don't have side-effects (for
instance, there is no variable assignment). Laziness means that
arguments to functions are evaluated only when they are needed.
Functional means that functions are “normal” values that can be passed
around and manipulated in interesting ways. The language is not a
full-featured, general purpose language. Its main job is to describe
packages, compositions of packages, and the variability within packages.
The Nix language is
This section presents the various features of the language.
- *domain-specific*
It only exists for the Nix package manager:
to describe packages and configurations as well as their variants and compositions.
It is not intended for general purpose use.
- *declarative*
There is no notion of executing sequential steps.
Dependencies between operations are established only through data.
- *pure*
Values cannot change during computation.
Functions always produce the same output if their input does not change.
- *functional*
Functions are like any other value.
Functions can be assigned to names, taken as arguments, or returned by functions.
- *lazy*
Expressions are only evaluated when their value is needed.
- *dynamically typed*
Type errors are only detected when expressions are evaluated.

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# Release 2.11 (2022-08-24)
* `nix copy` now copies the store paths in parallel as much as possible (again).
This doesn't apply for the `daemon` and `ssh-ng` stores which copy everything
in one batch to avoid latencies issues.