АБ
Size: a a a
АБ
АБ
KZ
AS
or
это не отдельный оператор, а часть точки:
e . attrpath [or def]
АБ
N
АБ
nix-repl> a = { foo = 5; bar.baz = "goo"; }
nix-repl> a.foo
5
nix-repl> a.bar.baz
"goo"
nix-repl> a.foo or "Not found"
5
nix-repl> a.bar.baz or "Not found"
"goo"
nix-repl> a.doo or "Not found"
"Not found"
nix-repl> a.doo.baz or "Not found"
"Not found"
АБ
?
кстатиАБ
nix-repl> a ? foo
true
nix-repl> a ? doo
false
nix-repl> a ? doo.baz
false
nix-repl> a ? bar.baz
true
AT
N
RK
АБ
Б
АБ
nix-channel
, то nix-channel --remove nixos; nix-channel --add https://nixos.org/channels/nixos-20.09 nixos
(ЕЯПП)Б