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Object-Oriented Programming in JavaScript
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Conteúdo do Curso

Object-Oriented Programming in JavaScript

Object-Oriented Programming in JavaScript

1. Classes & Objects
ClassesClass AttributesClass MethodsObjects' Creating Keyword 'this'Constructor
2. Encapsulation
Private ModifierGet and Set
3. Static
Static AttributesStatic Functions
4. Inheritance
What is an InheritanceConstructor InheritanceOverriding

bookStatic Functions

Methods also can be static. Let’s create compare() method with two parameters: studentA and studentB. This function will output which student has a higher GPA.


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

  static compare(studentA, studentB) {
    if (studentA.gpa > studentB.gpa) { console.log('First student has higher GPA.') }
    else if (studentA.gpa < studentB.gpa) { console.log('Second student has higher GPA.') }
    else { console.log('GPAs are equal.') }
}
}

rob = new Student('Robert', 22);
rob.gpa = 3.4;
steve = new Student('Steve', 19);
steve.gpa = 2.9
Student.compare(rob, steve);
copy

To call this method, you also have to use the name of the class, not the object:


              
1

            
Student.compare(studentA, studentB);
copy

Inside the static method, you can refer only to static class attributes, using this keyword, because non-static attributes are unique for each object, so for the whole class, they are undefined.

Note that in function compare() you refer to the non-static objects attributes studentA and studentB, but to the static class attributes Student.

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Seção 3. Capítulo 2
toggle bottom row

bookStatic Functions

Methods also can be static. Let’s create compare() method with two parameters: studentA and studentB. This function will output which student has a higher GPA.


              
123456789101112131415161718192021222324

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

  static compare(studentA, studentB) {
    if (studentA.gpa > studentB.gpa) { console.log('First student has higher GPA.') }
    else if (studentA.gpa < studentB.gpa) { console.log('Second student has higher GPA.') }
    else { console.log('GPAs are equal.') }
}
}

rob = new Student('Robert', 22);
rob.gpa = 3.4;
steve = new Student('Steve', 19);
steve.gpa = 2.9
Student.compare(rob, steve);
copy

To call this method, you also have to use the name of the class, not the object:


              
1

            
Student.compare(studentA, studentB);
copy

Inside the static method, you can refer only to static class attributes, using this keyword, because non-static attributes are unique for each object, so for the whole class, they are undefined.

Note that in function compare() you refer to the non-static objects attributes studentA and studentB, but to the static class attributes Student.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 3. Capítulo 2
toggle bottom row

bookStatic Functions

Methods also can be static. Let’s create compare() method with two parameters: studentA and studentB. This function will output which student has a higher GPA.


              
123456789101112131415161718192021222324

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

  static compare(studentA, studentB) {
    if (studentA.gpa > studentB.gpa) { console.log('First student has higher GPA.') }
    else if (studentA.gpa < studentB.gpa) { console.log('Second student has higher GPA.') }
    else { console.log('GPAs are equal.') }
}
}

rob = new Student('Robert', 22);
rob.gpa = 3.4;
steve = new Student('Steve', 19);
steve.gpa = 2.9
Student.compare(rob, steve);
copy

To call this method, you also have to use the name of the class, not the object:


              
1

            
Student.compare(studentA, studentB);
copy

Inside the static method, you can refer only to static class attributes, using this keyword, because non-static attributes are unique for each object, so for the whole class, they are undefined.

Note that in function compare() you refer to the non-static objects attributes studentA and studentB, but to the static class attributes Student.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Methods also can be static. Let’s create compare() method with two parameters: studentA and studentB. This function will output which student has a higher GPA.


              
123456789101112131415161718192021222324

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

  static compare(studentA, studentB) {
    if (studentA.gpa > studentB.gpa) { console.log('First student has higher GPA.') }
    else if (studentA.gpa < studentB.gpa) { console.log('Second student has higher GPA.') }
    else { console.log('GPAs are equal.') }
}
}

rob = new Student('Robert', 22);
rob.gpa = 3.4;
steve = new Student('Steve', 19);
steve.gpa = 2.9
Student.compare(rob, steve);
copy

To call this method, you also have to use the name of the class, not the object:


              
1

            
Student.compare(studentA, studentB);
copy

Inside the static method, you can refer only to static class attributes, using this keyword, because non-static attributes are unique for each object, so for the whole class, they are undefined.

Note that in function compare() you refer to the non-static objects attributes studentA and studentB, but to the static class attributes Student.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 3. Capítulo 2
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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