alan-ps/js_inheritance.md

## js_inheritance.md

      
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              js_inheritance.md
            
          
    Functional inheritance

function Animal() {
  var that = {};
  that.eats = true;
  return that;
}

function Dog() {
  var that = Animal();
  that.runs = true;
  return that;
}

var dog = Dog();
console.log(dog.eats); // true
Functional inheritance by a constructor

function Animal() {
  this.eats = true;
}

function Dog() {
  Animal.call(this);

  this.runs = true;
}

var dog = new Dog();
console.log(dog.eats); // true
Prototype inheritance

function Animal() {
  this.eats = true;
}

function Dog() {
  this.runs = true;
}

Dog.prototype = new Animal();

var dog = new Dog();
console.log(dog.eats); // true