Creating a serial number in a Class without relying on a global variable is a useful technique that

Question

Creating a serial number in a Class without relying on a global variable is a useful technique that

I am looking for a way to assign a unique ID to each instance of a Class without relying on global variables. I have tried using a global variable and incrementing it, but I would prefer a more efficient approach.

Is there a way to generate an ID within the Class itself, avoiding the use of global variables?

let id = 0;

class Member {
  constructor(firstName, lastName, birthDay) {
    this.id = ++id;
    this.firstName = firstName;
    this.lastName = lastName;
    this.birthDay = birthDay;
  }
}

const m1 = new Member('Oliver', 'Cruz', '11/13/1990');
console.log(m1.id); // 1

const m2 = new Member('Sophia', 'Brown', '11/30/1992');
console.log(m2.id); // 2

javascript class

Answer 1

Answer №1

A suggested approach is to place the counter directly within the Member object.

class Member {
  static membersCreated = 0;
  constructor(firstName, lastName, birthDay) {
    Member.membersCreated++;
    this.id = Member.membersCreated;
    this.firstName = firstName;
    this.lastName = lastName;
    this.birthDay = birthDay;
  }
}

const m1 = new Member('Oliver', 'Cruz', '11/13/1990');
console.log(m1.id); // 1

const m2 = new Member('Sophia', 'Brown', '11/30/1992');
console.log(m2.id); // 2

Answer 2

A suggested approach is to place the counter directly within the Member object.

class Member {
  static membersCreated = 0;
  constructor(firstName, lastName, birthDay) {
    Member.membersCreated++;
    this.id = Member.membersCreated;
    this.firstName = firstName;
    this.lastName = lastName;
    this.birthDay = birthDay;
  }
}

const m1 = new Member('Oliver', 'Cruz', '11/13/1990');
console.log(m1.id); // 1

const m2 = new Member('Sophia', 'Brown', '11/30/1992');
console.log(m2.id); // 2

Creating a serial number in a Class without relying on a global variable is a useful technique that

Answer №1

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