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Exercise 1

Rewrite the following Person class to use private fields for the name and age properties and provide a setter for setting the age property. Ensure that the setter raises a RangeError unless the age is a positive number.

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  showAge() {
    console.log(this.age);
  }
}

let person = new Person('John', 30);
person.showAge(); // 30
person.age = 31;
person.showAge(); // 31

try {
  // This line should raise a RangeError,
  // but does not.
  person.age = -5;
  person.showAge(); // -5
} catch (e) {
  //highlight
  // The following line should run, but won't
  console.log('RangeError: Age must be positive');
  //endhighlight
}

Solution

class Person {
  //highlight
  #name;
  #age;
  //endhighlight

  constructor(name, age) {
    //highlight
    this.#name = name;
    this.age = age; // Call the setter to validate data
    //endhighlight
  }

  //highlight
  set age(age) {
    if (typeof(age) === 'number' && age > 0) {
      this.#age = age;
    } else {
      throw new RangeError('Age must be positive');
    }
  }
  //endhighlight

  showAge() {
    //highlight
    console.log(this.#age);
    //endhighlight
  }
}

let person = new Person('John', 30);
person.showAge(); // 30
person.age = 31;
person.showAge(); // 31

try {
  person.age = -5;
  //highlight
  // The following line will not run
  person.showAge();
  //endhighlight
} catch (e) {
  //highlight
  // The following line will run
  console.log('RangeError: Age must be positive');
  //endhighlight
}

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