An example from http://yehudakatz.com/2011/08/ adapted to use the <| operator

person.js

var fromPrototype = function(prototype, object) {
  var newObject = Object.create(prototype);
 
  for (var prop in object) {
    if (object.hasOwnProperty(prop)) {
      newObject[prop] = object[prop];      
    }
  }
};
 
var person = {
  toString: function() {
    return this.firstName + ' ' + this.lastName;
  }
};
 
var man = fromPrototype(person, {
  sex: "male"
});
 
var jeremy = fromPrototype(man, {
  firstName: "Jeremy",
  lastName:  "Ashkenas"
});
 
jeremy.sex        // "male"
jeremy.toString() // "Jeremy Ashkenas"

person.next.js

var person = {
  toString: function() {
    return this.firstName + ' ' + this.lastName;
  }
};

var man = person <| {
  sex: "male"
};

var jeremy = man <| {
  firstName: "Jeremy",
  lastName:  "Ashkenas"
};

jeremy.sex        // "male"
jeremy.toString() // "Jeremy Ashkenas"

super-person.next.js

// This version demonstrates a reference to super

var person = {
  toString: function() {
    return this.firstName + ' ' + this.lastName;
  }
};

var man = person <| {
  sex: "male",
  toString: function() {
    return "Mr. " + super.toString();
  }
};

var jeremy = man <| {
  firstName: "Jeremy",
  lastName:  "Ashkenas"
};

jeremy.sex        // "male"
jeremy.toString() // "Mr. Jeremy Ashkenas"