Zoo excercise Javascript

zoo.js

class Animal{

  constructor(sound){
    this.sound = sound;
  }

  speak(text){

    //Split the input text by space.
    let chunks = text.split(' ');

    //Append the sound to each word.
    let newWords = chunks.map(word => `${word} ${this.sound}`);

    return newWords.join(' ');

  }

}

//Testing.
const lion   = new Animal('roar');
const tiger  = new Animal('grr');

console.log(lion.speak("I'm a lion"));
console.log(tiger.speak("Lion sucks"));