Kiumzishi instanceof katika OOP katika JavaScript
Kiumzishi instanceof huruhusu kuangalia
kama kitu ni cha darasa fulani.
Tuangalie kwa mfano. Hebu tuwe na
darasa lifuatalo:
class User {
}
Tutengeneze kitu kutoka kwa darasa hili:
let user = new User;
Tuangalie, kama kitu kutoka kwenye kibadilishaji ni cha darasa letu:
console.log(user instanceof User); // true
Amua, matokeo yatakuwaje ya kutekeleza msimbo ufuatao:
class Student {
}
class Employee {
}
let employee = new Employee;
console.log(employee instanceof Employee);
console.log(employee instanceof Student);
Kuna msimbo ufuatao:
class Student {
constructor(name) {
this.name = name;
}
}
class Employee {
constructor(name) {
this.name = name;
}
}
let users = [
new Student('user1'),
new Employee('user2'),
new Student('user3'),
new Employee('user4'),
new Student('user5'),
new Employee('user6'),
new Student('user7'),
];
Kagua kwa mzunguko safu ya vitu na uandike kwenye konsti majina ya wafanyikazi pekee.
