Impara Static 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);

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


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Student.compare(studentA, studentB);

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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Sezione 3. Capitolo 2

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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);

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


              1
            
Student.compare(studentA, studentB);

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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Sezione 3. Capitolo 2

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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);

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


              1
            
Student.compare(studentA, studentB);

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

Cambia al desktop per esercitarti nel mondo realeContinua da dove ti trovi utilizzando una delle opzioni seguenti

Tutto è chiaro?

Grazie per i tuoi commenti!

Static Functions

Awesome!

Static Functions

Awesome!

Static Functions