給料を500円玉の重さにして返す

500yen.coffee

#!/usr/bin/env coffee

argv = require 'argv'

getSalaryMass = (salary, {mass, coin} = {})->
  mass = mass or 7
  coin = coin or 500
  "#{(salary / coin) * mass}"

argv.option [
  {
    name: 'coin'
    short: 'c'
    description: '小銭の単位(yen)'
    type: 'int'
  },{
    name: 'weight'
    short: 'w'
    description: '小銭の重さ(g)'
    type: 'int'
  }
]
args = argv.run()

result = getSalaryMass args.targets[0],
  mass: args.options.weight
  coin: args.options.coin

console.log result