fakeserver.js

var numApples = 5;

function handleConn(name) {
  var pickedApples = 0;

  return function pick() {
    pickedApples++;
    numApples--;
    console.log(name, 'has', pickedApples, 'apples');
  };
}

// fake client connects
var tim = handleConn('tim');
var john = handleConn('john');
tim(); // tim has 1 apples
tim(); // tim has 2 apples
john(); // john has 1 apples
console.log(numApples); // 2

setTimeout(function() {
  tim(); // tim has 3 apples
  console.log(numApples); // 1
}, 500);

setTimeout(function() {
  john(); // john has 2 apples
  console.log(numApples); // 0
}, 1000);