Dispatcher design-pattern for docopt subcommands

docopt-subcommand-dispatcher.js

const docopt = require('docopt').docopt
const docstring = `
Naval Fate.

Usage:
  naval_fate ship new <name>...
  naval_fate ship <name> move <x> <y> [--speed=<kn>]
  naval_fate ship shoot <x> <y>
  naval_fate mine (set|remove) <x> <y> [--moored|--drifting]
  naval_fate -h | --help
  naval_fate --version

Options:
  -h --help     Show this screen.
  --version     Show version.
  --speed=<kn>  Speed in knots [default: 10].
  --moored      Moored (anchored) mine.
  --drifting    Drifting mine.
`

const subcommands = {
    ship: async function(args) {
        console.log('subcommand: ship')
    },

    mine: async function(args) {
        console.log('subcommand: mine')
    }
}


async function main() {

    let args = docopt(docstring)
    console.log(args)

    Object.keys(subcommands)
        .forEach(async (subcommand) =>
                 args[subcommand] && await subcommands[subcommand](args))
}


main()