Nix言語: with式

with

これを

code:nix-repl

nix-repl> longName = { a = 3; b = 4; }

nix-repl> longName.a + longName.b

7

こう書ける

code:nix-repl

nix-repl> with longName; a + b

7

名前が重複した場合は、Attribute Setsじゃない方の変数が優先される

code:nix-repl

nix-repl> longName = { a = 3; b = 4; }

nix-repl> let a = 10; in with longName; a + b

14

nix-repl> let a = 10; in with longName; longName.a + b

7