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Posted At Mon, Nov 13, 2023 7:55 AM

JavaScript Weak Set

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Table of Contents

1. Introduction to JavaScript Weak Set
- What is a Weak Set?
- Use Cases for Weak Sets
2. Creating a Weak Set
- Syntax for Weak Set Creation
- Adding and Deleting Elements
3. Characteristics of Weak Sets
- Weak References
- Limited Operations
4. Use Cases for Weak Sets
- Handling Private Data
- Managing Transient Data

1. Introduction to JavaScript Weak Set

- What is a Weak Set?

A Weak Set in JavaScript is a collection of objects with weak references. Unlike a regular Set, it allows for garbage collection of its elements if there are no other references to those objects.

- Use Cases for Weak Sets

Weak Sets are particularly useful in scenarios where you want to associate data with objects without preventing those objects from being garbage collected.

2. Creating a Weak Set

- Syntax for Weak Set Creation

let myWeakSet = new WeakSet();


- Adding and Deleting Elements

let obj1 = { key: 'value' };
let obj2 = { id: 42 };

myWeakSet.add(obj1);
myWeakSet.add(obj2);

myWeakSet.delete(obj1);

3. Characteristics of Weak Sets

- Weak References

Objects stored in a Weak Set are held by weak references, meaning they won't prevent garbage collection.

- Limited Operations

Weak Sets have limitations compared to regular Sets. They don't support iteration or clearing the entire set.

4. Use Cases for Weak Sets

- Handling Private Data

const privateData = new WeakSet();

class MyClass {
  constructor() {
    privateData.add(this);
  }

  isPrivate() {
    return privateData.has(this);
  }
}

- Managing Transient Data

Weak Sets are suitable for scenarios where you need to associate temporary data with objects that can be garbage collected when those objects are no longer needed.

In conclusion, JavaScript Weak Sets provide a specialized tool for scenarios where you need to associate data with objects without preventing their natural lifecycle. Understanding their characteristics and use cases can enhance your ability to design efficient and memory-conscious applications.

Next one is learning about JavaScript Indexed Collections.

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