gistfile1.js

// create the base task object
var task = {
  getName: function() {
    return "Frank";
  }
}
 
// now create a new timedTask object based on the task object
var timedTask = Object.create(task);
 
// specify any differences between timedTask and task.
// This is actually called 'differencial inheritance', for the curious
timedTask.getDuration = function() {
  return 42;
}
 
// do some tests
console.log(task.getName()); // returns 'Frank'
console.log(task.getDuration()); // ERROR: getDuration undefined
console.log(timedTask.getName()); // returns 'Frank'
console.log(timedTask.getDuration()); // returns 42

// create more objects!
var myTimedTask1 = Object.create(timedTask);
// override the duration for timed task 1
myTimedTask1.getDuration = function() {
  return 0;
}

var myTimedTask2 = Object.create(timedTask);
var myTimedTask3 = Object.create(timedTask);
var myTimedTask4 = Object.create(timedTask);