One thing that I find nicer with functional options is building tree-like data structures. My command line parsing library uses them to declaratively build CLI

One thing that I find nicer with functional options is building tree-like data structures. My command line parsing library uses them to declaratively build CLI apps with arbitrarily nested subcommands. Some examples at https://github.com/bbkane/warg/tree/master/examples https://github.com/bbkane/warg/tree/master/examples