.get()

gun.get(key)
gun.get(key, callback)
gun.get(callback, options)

// Navigate to a node by soul
var user = gun.get('user/alice')

// Navigate to nested properties
var name = gun.get('user/alice').get('name')

// Chain multiple gets
var color = gun.get('users').get('alice').get('car').get('color')

// Numeric keys are converted to strings
var item = gun.get('items').get(42)
// Equivalent to: gun.get('items').get('42')

// Filter data with a callback
gun.get('messages').map().get(function(message, id, msg, event){
  // Only process messages from Alice
  if(message.from === 'alice'){
    console.log('Message from Alice:', message.text)
  }
  // Return the data to pass it down the chain
  return message
})

// Invalid key length
var ref = gun.get('')
ref.on(function(data){
  // Will receive an error: "0 length key!"
})

// Invalid key type
var ref = gun.get(null)
ref.on(function(data){
  // Will receive an error: "Invalid get request!"
})

Gun.chain.get = function(key, cb, as){
  var gun, tmp;
  if(typeof key === 'string'){
    if(key.length == 0) {
      (gun = this.chain())._.err = {err: Gun.log('0 length key!', key)};
      if(cb){ cb.call(gun, gun._.err) }
      return gun;
    }
    var back = this, cat = back._;
    var next = cat.next || empty;
    if(!(gun = next[key])){
      gun = key && cache(key, back);
    }
    gun = gun && gun.$;
  }
  // ... callback and numeric key handling
}