Oops - Javascript

• JS Objects have a special property called prototype that is either null or references another object
• Prototypical Inheritance
  • When reading a property tha tis missing, taken from Prototype
• Syntax

      let variable = {
          functionName1: () => {}
      }
      variable.__proto__ = {
          functionName2: () => {}
      }
      variable.functionName2();
  

    class ClassName {
        functionName() {}
        constructor() {}
    }
    let variable = new ClassName();

    let variable = new ClassName();

    class ClassName1 {}
    class ClassName2 extends ClassName1 {
        // Call constructors and functions of parent class
        super(arguments);
        super.functionName(arguments);
    }

    class ClassName2 extends ClassName1 {
        // Created automatically
        constructor(...arguments) {
            super(...arguments);
        }
        // Custom
        constructor() {
            super();
            // this statements must be written after super()
        }
    }

    class ClassName {
        static functionName() {
            return value;
        }
    }
    // Calling
    ClassName.functionName();

    class ClassName {
        get variable() {
            return this._variable;
        }
        set variable(newVariable) {
            this._variable = newVariable;
        }
    }

• variable instanceof className => Returns boolean value true if object is a instance of class or any other class inheriting from it