https://nixos.org/manual/nix/stable/language/

https://code.tvl.fyi/about/nix/nix-1p
    https://github.com/tazjin/nix-1p

https://nixos.wiki/wiki/Overview_of_the_Nix_Language
https://nix.dev/tutorials/nix-language
https://learnxinyminutes.com/docs/nix/
https://ops.functionalalgebra.com/nix-by-example/
https://web.archive.org/web/20210121042658/https://ebzzry.io/en/nix/#nix