javascript [Design Patterns - Facade Pattern]

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This pattern involves a single class which provides simplified methods required by client and delegates calls to methods of existing system classes.

 

/** * Design Patterns - Facade Pattern * https://www.tutorialspoint.com/design_pattern/facade_pattern.htm */// interfacefunction Shape() {}Shape.prototype.draw = function() {throw "Shape::draw() must be overridden";};// implements Shapefunction Rectangle() {    Shape.call(this);}Rectangle.prototype = new Shape();Rectangle.prototype.draw = function() {    console.log("Rectangle::draw()");};// implements Shapefunction Square() {    Shape.call(this);}Square.prototype = new Shape();Square.prototype.draw = function() {    console.log("Square::draw()");};// implements shapefunction Circle() {    Shape.call(this);}Circle.prototype = new Shape();Circle.prototype.draw = function() {    console.log("Circle::draw()");};function ShapeMaker() {    this.circle = new Circle();    this.rectangle = new Rectangle();    this.square = new Square();}ShapeMaker.prototype.drawCircle = function() {    this.circle.draw();};ShapeMaker.prototype.drawRectangle = function() {    this.rectangle.draw();};ShapeMaker.prototype.drawSquare = function() {    this.square.draw();};function FacadePatternDemo() {    this.shapeMaker = new ShapeMaker();}FacadePatternDemo.prototype.main = function() {    this.shapeMaker.drawCircle();    this.shapeMaker.drawRectangle();    this.shapeMaker.drawSquare();};var demo = new FacadePatternDemo();demo.main();

　　

Output:

Circle::draw()
Rectangle::draw()
Square::draw()

javascript [Design Patterns - Facade Pattern]