Challenge: Managing Properties with Getters and Setters

Task

You are working within a Car class that has a private #mileage property. Your task is to define getters and setters for this property to control how it’s accessed and modified.

Define Getter for Mileage: Define a getter for the mileage property to retrieve the current mileage;
Define Setter for Mileage with Validation: Define a setter for the mileage property that accepts a new mileage value. This setter should:
- Only allow updating if the new mileage is greater than the current mileage (mileage can only increase);
- If the new mileage is invalid, log "Invalid mileage update" and do not change the current mileage.


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class Car {
  #mileage = 1000; // Initial private mileage

  // Getter for mileage
  _____ mileage() {
    return this.#_____;
  }

  // Setter for mileage with validation
  _____ mileage(newMileage) {
    _____ (_____ > this.#_____) {
      this.#_____ = newMileage;
    } _____ {
      console.log(_____);
    }
  }
}

// Testing
const car1 = new Car();

console.log(car1.mileage); // Expected: 1000

car1.mileage = 1500; // Update mileage to 1500
console.log(car1.mileage); // Expected: 1500

car1.mileage = 900; // Attempt invalid mileage update, expected: Invalid mileage update

Define a get accessor for mileage to retrieve the current mileage;
Define a set accessor for mileage that takes newMileage as a parameter;
In the setter, check if newMileage is greater than the current mileage (this.#mileage);
If newMileage is valid, update #mileage to newMileage;
If newMileage is not greater than the current mileage, log "Invalid mileage update" and do not change the mileage.


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class Car {
  #mileage = 1000; // Initial private mileage

  // Getter for mileage
  get mileage() {
    return this.#mileage;
  }

  // Setter for mileage with validation
  set mileage(newMileage) {
    if (newMileage > this.#mileage) {
      this.#mileage = newMileage;
    } else {
      console.log('Invalid mileage update');
    }
  }
}

// Testing
const car1 = new Car();

console.log(car1.mileage); // Output: 1000

car1.mileage = 1500; // Update mileage to 1500
console.log(car1.mileage); // Output: 1500

car1.mileage = 900; // Attempt invalid mileage update, expected: Invalid mileage update

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 10