JavaScript-Meal-Maker

Overview

This program demonstrates how to use getters and setters in a JavaScript object to manage a restaurant menu. It allows setting a meal and its price, ensures that the inputs are valid, and provides a formatted output for the day’s special. The approach showcases encapsulation and basic data validation within an object.

Key Features & Techniques

1. Private Properties Convention

   • The properties _meal and _price are prefixed with an underscore to indicate they are intended as private, following common JavaScript conventions.

2. Setters with Validation

   • The meal setter ensures that only non-empty strings can be assigned as a meal.
   • The price setter ensures that a price is only set after a meal has been specified, and that the price is a positive number.
   • Warnings are logged if validation fails, helping to prevent incorrect data entry.

3. Getter for Derived Output

   • The todaysSpecial getter returns a formatted string describing the special of the day, only if both meal and price have been set correctly.
   • If either value is missing or invalid, it provides a helpful message indicating the issue.

4. Encapsulation and Data Integrity

   • By using getters and setters, the object controls how its internal properties are modified and accessed, ensuring data consistency.

5. Readable Output

   • The final message clearly communicates the daily special in a user-friendly format.

Example Output

Example: Meal Set as "noodles" and Price as 21

Today's Special is noodles for $21!

Invalid Scenarios

• Setting a price before a meal: Set a meal first before setting the price

• Setting an empty meal: Meal must be a non-empty string

• Setting a non-positive price: Price must be a positive number

Conclusion

This programme illustrates how to use object-oriented techniques in JavaScript to manage and validate data. It highlights the benefits of getters and setters, encapsulation, and data integrity, while providing clear, user-friendly feedback through console messages. It is a practical example of controlling access to an object’s properties while producing dynamic outputs based on valid inputs.