#privateField not accessible using bracket notation in JavaScript [duplicate]

Why is private field in JavaScript not accessible using bracket ([]) notation but accessible using dot (.) notation?

• Using dot notation:

      class MyClass {
        #privateField = 42;
  
        publicMethod() {
          console.log(this.#privateField);
        }
      }
  
      const obj = new MyClass();
      obj.publicMethod(); // 42

• Using bracket notation:

      class MyClass {
        #privateField = 42;
  
        publicMethod() {
          console.log(this['#privateField']);
        }
      }
  
      const obj = new MyClass();
      obj.publicMethod(); // undefined