javascript classes

                                    //private but is a good example
class includes {
    constructor(){}
  
    inculde_apps(file) { 
      var script  = document.createElement('script'); 
      script.src  = "ext/apps/"+file; 
      script.type = 'text/javascript'; 
      document.getElementsByTagName('body').item(0).appendChild(script);
    } 
    
    inculde_scripts(file) { 
      var script  = document.createElement('script'); 
      script.src  = "ext/scripts/"+file; 
      script.type = 'text/javascript'; 
      document.getElementsByTagName('body').item(0).appendChild(script);
    } 
    
    inculde_css(file) { 
        var script  = document.createElement('link'); 
        script.rel  = "stylesheet"; 
        script.type = 'text/css'; 
        script.href = "css/"+file;
        document.getElementsByTagName('head').item(0).appendChild(script);
    }
  }

                                    class Rectangle {
  constructor(height, width) {
    this.height = height;
    this.width = width;
  }
  // Getter
  get area() {
    return this.calcArea();
  }
  // Method
  calcArea() {
    return this.height * this.width;
  }
}

const square = new Rectangle(10, 10);

console.log(square.area); // 100

                                    let Person = class {
  constructor(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }
}

                                    //use classes by initiating one like so:
class MyClass {
	constructor(FirstProperty, SecondProperty, etcetera) {
    	//The constructor function is called with the new class 
      	//instance's parameters, so this will be called like so:
      	//var classExample = new MyClass("FirstProperty's Value", ...)
      this.firstProperty = FirstProperty;
      this.secondProperty = SecondProperty;
    }
  //creat methods just like functions:
  method(Parameters) {
  	//Code Here
  }
  //getters are properties that are calculated when called, versus fixed
  //variables, but still have no parenthesis when used
  get getBothValues() 
  {
  	return [firstProperty, secondProperty];
  }
}
//Note: this is all syntax sugar reducing the boilerplate versus a
// function-defined object.

                                    class SayHelloTo {
  name (to) {
    console.log(`Hello ${to}`);
  }
  constructor (to) {
    this.name(to);
  }
}
const helloWorld = new SayHelloTo(World);