ecmascript6-classes/index.html at master · FalafelSoftwareInc/ecmascript6-classes · GitHub

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<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

    <script>
        'use strict';

        /*
         * Create a base class
         */
        class Animal {
            /*
             * The initialization method that will be
             * called when a new instance is created
             */
            constructor(options) {
                options = options || {};

                // Save properties or use defaults
                this.name = options.name;
                this.move = options.move || 'moves';
                this.legs = options.legs || 0;
            }

            /*
             * Describes the animal's movement
             */
            describe() {
                alert(this.name
                    + ' walks with ' + this.legs
                    + ' legs and ' + this.move + '.');
            }

            get name() {
                return this._name.toUpperCase();
            }

            set name(value) {
                this._name = value || 'Animal';
            }
        }

        /*
         * Inherit from that class
         */
        class Bird extends Animal {
            constructor(options) {
                // Save defaults
                options.move = 'flies';
                options.legs = 2;

                // Call base constructor
                super.constructor(options);
            }
        }

        /*
         * Inherit from that class
         */
        class Cat extends Animal {
            constructor(options) {
                // Save defaults
                options.move = 'sneaks';
                options.legs = 4;

                // Call base constructor
                super.constructor(options);
            }
        }

        // Create instances
        var creature = new Animal();
        var tweety = new Bird({ name: 'Tweety' });
        var sylvester = new Cat({ name: 'Sylvester' });

        // Run
        creature.describe();
        tweety.describe();
        sylvester.describe();
    </script>
</body>
</html>