Question 219668 in Javascript Question posted in
A very good W3school tutorial can be found here.

How to resue javascript class instances

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }
 
  sayHello() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }
}

I can create instance as person = new Person('Alice', 30);

But in my case i need to create many instances which will do their work and gets removed, but i want to reuse that instance once its work is done.
I know there is no api like this.resetInstance() but is there any way to achieve this?

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2

Answers


  1. 0

    It most cases it does not worth the effort. But, if you want to do it, here you go:

    class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }
 
  sayHello() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }

  set(name, age) {
    this.name = name;
    this.age = age;
  }

}
const person = new Person('A', 1000);
person.sayHello(); // Hello, my name is A and I'm 1000 years old.
person.set('B', 2000); 
person.sayHello(); // Hello, my name is B and I'm 2000 years old.
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  2. 0

    Just make a cache.

    class Person {
  constructor(name, age) {
    console.log('Person constructor run')
    this.name = name;
    this.age = age;
  }
  sayHello() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }
}
const instanceCache = {};
function getInstance(name,age) {
  if(!instanceCache[`${name}${age}`]){
    instanceCache[`${name}${age}`] =  new Person(name,age);
  }
  return instanceCache[`${name}${age}`];
}

const p1 = getInstance('Jack', 18);
const p2 = getInstance('Jack', 18);
const p3 = getInstance('Bob', 20);
console.log(p1 === p2); // true
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