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);
123456789101112131415161718192021222324class 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);
1Student.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.
Var allt tydligt?
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Avsnitt 3. Kapitel 2
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