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<html><head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>JS Bin</title></head><body></body></html>class Animal { constructor(name) { this.name = name; } speak() { console.log(this.name + ' makes a noise.'); }}class Dog extends Animal { speak() { console.log(this.name + ' barks.'); }}var d = new Dog('Mitzie');d.speak();
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