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manual: set -> attribute set

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reword description to have shorter sentences.
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Valentin Gagarin 2022-07-28 16:10:22 +02:00
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22
doc/manual/src/expressions/language-values.md
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@ -172,25 +172,27 @@ function and the fifth being a set.
Note that lists are only lazy in values, and they are strict in length.
## Sets
## Attribute Sets
Sets are really the core of the language, since ultimately the Nix
language is all about creating derivations, which are really just sets
of attributes to be passed to build scripts.
Attribute sets are collections of name-value-pairs (called *attributes*) enclosed in curly brackets (`{ }`).
Sets are just a list of name/value pairs (called *attributes*) enclosed
in curly brackets, where each value is an arbitrary expression
terminated by a semicolon. For example:
Names and values are separated by an equal sign (`=`).
Each value is an arbitrary expression terminated by a semicolon (`;`).
Attributes can appear in any order.
An attribute name may only occur once.
Example:
```nix
{ x = 123;
{
x = 123;
text = "Hello";
y = f { bla = 456; };
}
```
This defines a set with attributes named `x`, `text`, `y`. The order of
the attributes is irrelevant. An attribute name may only occur once.
This defines a set with attributes named `x`, `text`, `y`.
Attributes can be selected from a set using the `.` operator. For
instance,