Created
July 5, 2017 01:57
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ES5 vs ES6 constructor functions
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'use strict'; | |
/** | |
* Shape class. | |
* | |
* @constructor | |
* @param {String} id - The id. | |
* @param {Number} x - The x coordinate. | |
* @param {Number} y - The y coordinate. | |
*/ | |
function Shape(id, x, y) { | |
this.id = id; | |
this.setLocation(x, y); | |
} | |
/** | |
* Set shape location. | |
* | |
* @param {Number} - The x coordinate. | |
* @param {Number} - The y coordinate. | |
*/ | |
Shape.prototype.setLocation = function(x, y) { | |
this.x = x; | |
this.y = y; | |
}; | |
/** | |
* Get shape location. | |
* | |
* @return {Object} | |
*/ | |
Shape.prototype.getLocation = function() { | |
return {x: this.x, y: this.y}; | |
}; | |
/** | |
* Get shape description. | |
* | |
* @return {String} | |
*/ | |
Shape.prototype.toString = function() { | |
return 'Shape("' + this.id + '")'; | |
}; | |
/** | |
* Circle class. | |
* | |
* @constructor | |
* @param {String} id - The id. | |
* @param {Number} x - The x coordinate. | |
* @param {Number} y - The y coordinate. | |
* @param {Number} radius - The radius. | |
*/ | |
function Circle(id, x, y, radius) { | |
Shape.call(this, id, x, y); | |
this.radius = radius; | |
} | |
Circle.prototype = Object.create(Shape.prototype); | |
Circle.prototype.constructor = Circle; | |
/** | |
* Get circle description. | |
* | |
* @return {String} | |
*/ | |
Circle.prototype.toString = function() { | |
return 'Circle > ' + Shape.prototype.toString.call(this); | |
}; | |
// test the classes | |
var myCircle = new Circle('mycircleid', 100, 200, 50); // create new instance | |
console.log(myCircle.toString()); // Circle > Shape("mycircleid") | |
console.log(myCircle.getLocation()); // { x: 100, y: 200 } |
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'use strict'; | |
/** | |
* Shape class. | |
* | |
* @constructor | |
* @param {String} id - The id. | |
* @param {Number} x - The x coordinate. | |
* @param {Number} y - The y coordinate. | |
*/ | |
class Shape { | |
constructor(id, x, y) { // constructor syntactic sugar | |
this.id = id; | |
this.setLocation(x, y); | |
} | |
/** | |
* Set shape location. | |
* | |
* @param {Number} - The x coordinate. | |
* @param {Number} - The y coordinate. | |
*/ | |
setLocation(x, y) { // prototype function | |
this.x = x; | |
this.y = y; | |
} | |
/** | |
* Get shape location. | |
* | |
* @return {Object} | |
*/ | |
getLocation() { | |
return {x: this.x, y: this.y}; | |
} | |
/** | |
* Get shape description. | |
* | |
* @return {String} | |
*/ | |
toString() { | |
return `Shape("${this.id}")`; | |
} | |
} | |
/** | |
* Circle class. | |
* | |
* @constructor | |
* @param {String} id - The id. | |
* @param {Number} x - The x coordinate. | |
* @param {Number} y - The y coordinate. | |
* @param {Number} radius - The radius. | |
*/ | |
class Circle extends Shape { | |
constructor(id, x, y, radius) { | |
super(id, x, y); // call Shape's constructor via super | |
this.radius = radius; | |
} | |
/** | |
* Get circle description. | |
* | |
* @return {String} | |
*/ | |
toString() { // override Shape's toString | |
return `Circle > ${super.toString()}`; // call `super` instead of `this` to access parent | |
} | |
} | |
// test the classes | |
var myCircle = new Circle('mycircleid', 100, 200, 50); // create new instance | |
console.log(myCircle.toString()); // Circle > Shape("mycircleid") | |
console.log(myCircle.getLocation()); // { x: 100, y: 200 } |
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