JavaScript Interview Questions
  • JavaScript Interview Questions
  • Contact
  • Introduction
  • Question 1
  • Question 2
  • Question 3
  • Question 4
  • Question 5
  • Question 6
  • Question 7
  • Question 8
  • Question 9
  • Question 10
  • Question 11
  • Question 12
  • Question 13
  • Question 14
  • Question 15
  • Question 16
  • Question 17
  • Question 18
  • Question 19
  • Question 20
  • Question 21
  • Question 22
  • Question 23
  • Question 24
  • Question 25
  • Question 26
  • Question 27
  • Question 28
  • Question 29
  • Question 30
  • Question 31
  • Question 32
  • Question 33
  • Question 34
  • Question 35
  • Question 36
  • Question 37
  • Question 38
  • Question 39
  • Question 40
  • Question 41
  • Question 42
  • Question 43
  • Question 44
  • Question 45
  • Question 46
  • Question 47
  • Question 48
  • Question 49
  • Question 50
  • Question 51
  • Question 52
  • Question 53
  • Question 54
  • Question 55
  • Question 56
  • Question 57
  • Question 58
  • Question 59
  • Question 60
  • Question 61
  • Question 62
  • Question 63
  • Question 64
  • Question 65
  • Question 66
  • Question 67
  • Question 68
  • Question 69
  • Question 70
  • Question 71
  • Question 72
  • Question 73
  • Question 74
  • Question 75
  • Question 76
  • Question 77
  • Question 78
  • Question 79
  • Question 80
  • Question 81
  • Question 82
  • Question 83
  • Question 84
  • Question 85
  • Question 86
  • Question 87
  • Question 88
  • Question 89
  • Question 90
  • Question 91
  • Question 92
  • Question 93
  • Question 94
  • Question 95
  • Question 96
  • Question 97
  • Question 98
  • Question 99
  • Question 100
  • Epilogue
Powered by GitBook
On this page
  • Question
  • Answer

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.

PreviousQuestion 66NextQuestion 68

Last updated 9 months ago