Question

How to expose a read-only integer to the outside class while being writable inside a class with JavaScript

Answer 1

class MyClass {
  #val; // Default private field value

  constructor(initialValue = 1000) { // Provide a default value
    this.#val = initialValue;
  }

  // Getter to expose the value as read-only
  get value() {
    return this.#val;
  }
}

const obj1 = new MyClass(); // Uses default value (1000)
console.log(obj1.value); 

// obj.val = 23; // Error: Cannot set property 'val'

const obj2 = new MyClass(300); // Uses provided value (5000)
console.log(obj2.value); 



/*
run:

1000
300

*/

 

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