Min måttligt ambitiösa adressbok för mejslas JavaScript-cirkel 2013

addressbook.js

// redefine read so that it returns strings
read = (function() { 
  var oldRead = read
  return function(prompt) {
    return oldRead(prompt) + "";
  }
})();

// show a menu based on a input list of menu items
// menuItems: [{ key: 'K', action: function, desc: 'Description' }, ...]
function showMenu(menuItems) {
  var done = false

  var menu = {
    // quit the event loop
    Q: { action: function() { done = true }, desc: "Quit" },
    // print the entire menu
    print: function() {
      for (key in menu) {
        if (key.length == 1 && menu.hasOwnProperty(key)) {
          var item = menu[key]
          println(key + ": " + item.desc)
        }
      }
    },
    handleInput: function() {
      var input = read().toUpperCase()
      var selected = menu[input]
      if (selected && selected.action) {
        selected.action()
      } else {
        println("Unknown menu option " + input)
      }
    }
  }
  // add each menu item to the menu
  menuItems.forEach(function(item) {
    menu[item.key] = item
  }) 

  // event loop
  while (!done) {
    menu.print()
    menu.handleInput()
  }
}

function createAddressBook() {
  var db = []

  return {
    addAddress: function() {
      println("Add address:")
      db.push({
        name: read("Name: "),
        street: read("Street: "),
        zip: read("Zip Code: "),
        city: read("City: ")
      })
    }, 
    listAddresses: function() {
      if (db.length == 0) {
        println("Addressbook is empty!")
      } else {
        println("All addresses:")
        db.forEach(function(entry) {
          println("Name: " + entry.name + 
            ", Street: " + entry.street + " Zip Code: " + entry.zip + 
            ", City: " + entry.city)
        })
      }
    },
    deleteAddress: function() {
      println("Delete address:")
      var index = read("Entry no to delete: ")
      db.splice(index, 1)
    }
  }
}

var addressBook = createAddressBook();
showMenu([
  { key: "A", action: addressBook.addAddress, desc: "Add an address" },
  { key: "D", action: addressBook.deleteAddress, desc: "Delete an address" },
  { key: "P", action: addressBook.listAddresses, desc: "Print all addresses" }
])