Private Modifier

Encapsulation is a process of control and validating the behavior of the class and class intances. Our Student has name and age attributes, and the user can access them from any place of program, and, of course, change it. Seems that it is not the best approach – you created a student with the name Mary, and suddenly you want to change it directly, or you want to change the age, and you assign it with some non-correct value, for example, -12.

That’s why there is an access modifier private: to forbid access to the attributes or method. You can access it only inside the class(for example, inside the method’s body). By default, all methods and attributes are public: you can access them anywhere in your program.

To make properties private, use #.


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class Student{
  #name;
  #university;
  #age;
  #gpa;

  constructor(name, age){
    this.#name = name;
    this.#age = age;
  console.log('Student created');
  }

  sleep(){
    console.log('I am sleeping right now!');
  }
  happyBirthday(){
    this.#age += 1;
    console.log('Today is my birthday');
  }
}

student = new Student('Robert', 22);

Task

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Make age and name attributes public and let other attributes be private. Implement the constructor and then create a Student object and output the name of this object.

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Section 2. Chapter 1

Private Modifier

To make properties private, use #.


              12345678910111213141516171819202122
            
class Student{
  #name;
  #university;
  #age;
  #gpa;

  constructor(name, age){
    this.#name = name;
    this.#age = age;
  console.log('Student created');
  }

  sleep(){
    console.log('I am sleeping right now!');
  }
  happyBirthday(){
    this.#age += 1;
    console.log('Today is my birthday');
  }
}

student = new Student('Robert', 22);

Task

Swipe to show code editor

Make age and name attributes public and let other attributes be private. Implement the constructor and then create a Student object and output the name of this object.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 2. Chapter 1

Switch to desktop for real-world practiceContinue from where you are using one of the options below