The plain-English version
Treating an existing value as unchanged and creating a new value when an update is needed.
Why it matters
It makes changes easier to track in systems that compare references or preserve earlier state.
Let’s make it click
Create a new task list with one updated item instead of altering the old list in place.
Vibe Bro’s heads-up
Copying an outer object does not automatically copy every nested object inside it.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: Read the full explanation, examples, and pitfalls; no material factual error identified. References are supporting reading, not a sentence-by-sentence source concordance.