Classes in es6

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classes
90%

Under the hood, ES6 classes are not something that is radically new: They mainly provide more convenient syntax to create old-school constructor functions, You can see that if you use typeof:,However, backward-compatibility matters, which is why classes being constructor functions also makes sense

Example_snippet/controller/utility/_classes.js/ class Point { constructor(. . .
class Point {
   constructor(x, y) {
      this.x = x;
      this.y = y;
   }
   toString() {
      return `(${this.x}, ${this.y})`;
   }
}

class ColorPoint extends Point {
   constructor(x, y, color) {
      super(x, y);
      this.color = color;
   }
   toString() {
      return super.toString() + ' in ' + this.color;
   }
}
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88%

Classes are an essential part of object-oriented programming (OOP), Classes are used to define the blueprint for real-world object modeling and organize the code into reusable and logical parts

Example_snippet/controller/utility/_classes.js/ The Name of the student is: P. . .
The Name of the student is: Peter
The Age of the student is: 20
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72%

One way to define a class is using a class declaration, To declare a class, you use the class keyword with the name of the class ("Rectangle" here)

Example_snippet/controller/utility/_classes.js/ class Rectangle { constructo. . .
class Rectangle {
   constructor(height, width) {
      this.height = height;
      this.width = width;
   }
}
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65%

Example_snippet/controller/utility/_classes.js/ function Circle(radius) { . . .
function Circle(radius) {
   this.radius = radius;
   Circle.circlesMade++;
}

Circle.draw = function draw(circle, canvas) {
   /* Canvas drawing code */ }

Object.defineProperty(Circle, "circlesMade", {
   get: function() {
      return !this._count ? 0 : this._count;
   },

   set: function(val) {
      this._count = val;
   }
});

Circle.prototype = {
   area: function area() {
      return Math.pow(this.radius, 2) * Math.PI;
   }
};

Object.defineProperty(Circle.prototype, "radius", {
   get: function() {
      return this._radius;
   },

   set: function(radius) {
      if (!Number.isInteger(radius))
         throw new Error("Circle radius must be an integer.");
      this._radius = radius;
   }
});
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75%

ECMAScript 2015, also known as ES6, introduced JavaScript Classes,,JavaScript Classes are templates for JavaScript Objects

Example_snippet/controller/utility/_classes.js/ class. . .
class
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40%

There are three concepts in Object-Oriented Programming Object, Class and Methods, The ES6 JavaScript supports the Object-Oriented programming components

Example_snippet/controller/utility/_model.js/ class Class_name { }. . .
class Class_name {}
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