MethodInvocationInheritancePerformance.js

const LOOP_COUNT = 1000 * 1000;

var startTime = 0;

function benchStart() {
  startTime = new Date().getTime();
}

function printTime() {
  console.log((new Date().getTime())- startTime);
}


////// Pseudo classical

function LivingBeing(age) {
  this.age = age;
}

LivingBeing.prototype.getAge = function() {
  return this.age;
};

function Person(name, age) {
  this.name = name;
  this.age = age;
}

Person.prototype = new LivingBeing();

Person.prototype.getNameAndAge = function() {
  return "Name: " + this.name + " and age: " + this.getAge();
};

/////// Testing it
console.log("Pseudo classical inheritance...");
for(var c = 0; c < 10; c++) {
  benchStart();
  var p = new Person("Person " + i, i+1);
  for(var i = 0; i < LOOP_COUNT; i++) {
    p.getNameAndAge();
  }
  printTime();
}

/////// Functional

function livingBeing(age) {
  return {
    getAge: function() {
      return age;
    }
  };
}

function person(name, age) {
  var that = livingBeing(age);
  that.getNameAndAge = function() {
    return "Name: " + name + " and age: " + that.getAge();
  };
  return that;
}

/////// Testing it
console.log("And now functional inheritance...");
for(var c = 0; c < 10; c++) {
  benchStart();
  var p = person("Person " + i, i+1);
  for(var i = 0; i < LOOP_COUNT; i++) {
    p.getNameAndAge();
  }
  printTime();
}