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Question 67

Question

Explain the difference between Worker and SharedWorker in web workers.

Answer

1. Worker:

  • Purpose: Designed for individual tasks that need to run independently.

  • Isolation: Each Worker instance operates completely isolated from other workers and the main thread. They have their own separate scopes, variables, and memory.

  • Communication: Communication with a Worker is done using messages:

    • The main thread sends messages to the worker using worker.postMessage().

    • The worker responds to the main thread by sending messages back through onmessage events on the main thread.

2. SharedWorker:

  • Purpose: Primarily for scenarios where multiple scripts (or different parts of the same script) need to share data and communicate in a synchronized way.

  • Sharing: Multiple tabs or windows can connect to the same SharedWorker instance, allowing them to share data and collaborate on tasks.

  • Communication:

    • Similar message-based communication as Worker, using postMessage() and onmessage.

    • The SharedWorker maintains a global state accessible by all connected clients. Changes made by one client are immediately visible to others.

When to Use Which:

Feature

Worker

SharedWorker

Isolation

High - Each worker is completely separate

Lower - Multiple scripts share state

Communication

Message-based, one-to-one with main thread

Message-based, multiple clients share state

Use Cases

Intensive computations, background tasks

Data sharing between tabs/windows, collaborative applications

In a nutshell: Worker is for isolated tasks that don't need to share data. SharedWorker is for scenarios where collaboration and shared data are essential.

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Last updated 6 months ago