js factory functory functions for constructor code example

Example 1: javascript constructor function vs factory function

function ConstructorFunction() {
   this.someProp1 = "1";
   this.someProp2 = "2";
}
ConstructorFunction.prototype.someMethod = function() { /* whatever */ };

function factoryFunction() {
   var obj = {
      someProp1 : "1",
      someProp2 : "2",
      someMethod: function() { /* whatever */ }
   };
   // other code to manipulate obj in some way here
   return obj;
}

Example 2: factory function vs constructor javascript

// constructor
function ConstructorCar () {}
ConstructorCar.prototype.drive = function () {
  console.log('Vroom!');
};

const car2 = new ConstructorCar();
console.log(car2.drive());

// factory
const proto = {
  drive () {
    console.log('Vroom!');
  }
};

const factoryCar = () => Object.create(proto);
const car3 = factoryCar();
console.log(car3.drive());

// class
class ClassCar {
  drive () {
    console.log('Vroom!');
  }
}
const car1 = new ClassCar();
console.log(car1.drive());