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Amy de Buitléir 2023-12-01 20:14:26 +00:00
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19
source/nix-language/attribute-sets.adoc
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@ -1,5 +1,24 @@
= Attribute set operations
An ordinary attribute set cannot refer to its own elements.
To do this, you need a _recursive_ attribute set.
[source]
....
nix-repl> { x = 3; y = 4*x; }
error: undefined variable 'x'
at «string»:1:16:
1| { x = 3; y = 4*x; }
| ^
nix-repl> rec { x = 3; y = 4*x; }
{ x = 3; y = 12; }
....
The `.` operator selects an attribute from a set.
[source]