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Object-Oriented Programming in JavaScript

bookStatic Attributes

As you already know, each object can have a unique attribute value, like, for example, studentA has name Andrew and studentB has name William. But sometimes it makes sense to set some static value - the common for all instances of the class.

Let's add a attribute called ageOfMajority. Obviously, the value is 18 for all Students’ objects, and can't be different for different students. We’ll add a static keyword.


              
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class Student{
  name;
  age;
  static ageOfMajority = 18
  constructor(name, age){
    this.name = name;
    this.age = age;
    console.log('Student created');
  }
}

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

console.log(Student.ageOfMajority);
copy

To refer to the static attribute, use the name of the class, not the object, because it is a property of the class.

Inside non-static functions, you can refer static attribute only using class name, not this keyword. Look how we refer non-static age and static ageOfMajority in method drink():


              
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class Student{
  name;
  age;
  static ageOfMajority = 18;
  constructor(name, age){
    this.name = name;
    this.age = age;
    console.log('Student created');
  }
  drink(){
    if (this.age < Student.ageOfMajority){
      console.log('I am too young, only', this.age, 'yrs old.');
    } else {
      console.log('I am drunk.');
    }
  }
}

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

student.drink();
copy
Taak

Swipe to start coding

Let's create function interview(), which assigns a student to the class A, if GPA >= 3.0, or class B if not. For this, define static attribute gpaLimit and assign it with 3.0, and inside interview() function compare it with student's GPA. Print message Assigned to the class A or Assigned to the class B.

Oplossing

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bookStatic Attributes

As you already know, each object can have a unique attribute value, like, for example, studentA has name Andrew and studentB has name William. But sometimes it makes sense to set some static value - the common for all instances of the class.

Let's add a attribute called ageOfMajority. Obviously, the value is 18 for all Students’ objects, and can't be different for different students. We’ll add a static keyword.


              
1234567891011121314

            
class Student{
  name;
  age;
  static ageOfMajority = 18
  constructor(name, age){
    this.name = name;
    this.age = age;
    console.log('Student created');
  }
}

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

console.log(Student.ageOfMajority);
copy

To refer to the static attribute, use the name of the class, not the object, because it is a property of the class.

Inside non-static functions, you can refer static attribute only using class name, not this keyword. Look how we refer non-static age and static ageOfMajority in method drink():


              
123456789101112131415161718192021

            
class Student{
  name;
  age;
  static ageOfMajority = 18;
  constructor(name, age){
    this.name = name;
    this.age = age;
    console.log('Student created');
  }
  drink(){
    if (this.age < Student.ageOfMajority){
      console.log('I am too young, only', this.age, 'yrs old.');
    } else {
      console.log('I am drunk.');
    }
  }
}

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

student.drink();
copy
Taak

Swipe to start coding

Let's create function interview(), which assigns a student to the class A, if GPA >= 3.0, or class B if not. For this, define static attribute gpaLimit and assign it with 3.0, and inside interview() function compare it with student's GPA. Print message Assigned to the class A or Assigned to the class B.

Oplossing

Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 3. Hoofdstuk 1
single

single

close

Awesome!

Completion rate improved to 7.69

bookStatic Attributes

Veeg om het menu te tonen

As you already know, each object can have a unique attribute value, like, for example, studentA has name Andrew and studentB has name William. But sometimes it makes sense to set some static value - the common for all instances of the class.

Let's add a attribute called ageOfMajority. Obviously, the value is 18 for all Students’ objects, and can't be different for different students. We’ll add a static keyword.


              
1234567891011121314

            
class Student{
  name;
  age;
  static ageOfMajority = 18
  constructor(name, age){
    this.name = name;
    this.age = age;
    console.log('Student created');
  }
}

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

console.log(Student.ageOfMajority);
copy

To refer to the static attribute, use the name of the class, not the object, because it is a property of the class.

Inside non-static functions, you can refer static attribute only using class name, not this keyword. Look how we refer non-static age and static ageOfMajority in method drink():


              
123456789101112131415161718192021

            
class Student{
  name;
  age;
  static ageOfMajority = 18;
  constructor(name, age){
    this.name = name;
    this.age = age;
    console.log('Student created');
  }
  drink(){
    if (this.age < Student.ageOfMajority){
      console.log('I am too young, only', this.age, 'yrs old.');
    } else {
      console.log('I am drunk.');
    }
  }
}

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

student.drink();
copy
Taak

Swipe to start coding

Let's create function interview(), which assigns a student to the class A, if GPA >= 3.0, or class B if not. For this, define static attribute gpaLimit and assign it with 3.0, and inside interview() function compare it with student's GPA. Print message Assigned to the class A or Assigned to the class B.

Oplossing

Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

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