Technology Quote by Eric Freeman
““when you send an object the worker gets a copy of it. Any changes the worker makes will not affect the object in your main page. The worker is executing in a different environment than your main page, so you have no access to objects there. The same is true of objects the worker sends you: you get a copy of them.””
About This Quote
Source Book: Head First JavaScript Programming, O'Reilly, 2014
Objects are passed to web workers by value, so each side works on its own copy, preventing shared mutable state.
In simple terms: Workers get copies, not shared objects.
Key Takeaway
Use workers for parallel tasks without worrying about side‑effects.
Themes
concurrency
web workers
immutability
Mood
technical
practical
Type
explanatory
instructional
When to use this quote
- background data processing
- image manipulation
- large calculations
- UI responsiveness
Key Concepts
copy‑on‑write
thread isolation
Questions to Reflect On
- How do you synchronize results from a worker?
- When is copying data too costly?
A Different Perspective
Changes in the worker cannot affect the main thread directly, requiring message passing for coordination.
