It is tricky. Shallow copies like the spread operator only copy the first level. Nested objects stay linked. JSON.stringify is a common trick. It fails with Map, Set, and Date. The structuredClone () ...
This is called a shallow copy (or really, no copy at all). The fix? A deep copy — a completely independent clone: const b = JSON.parse (JSON.stringify (a)); // simple objects // or const b = ...
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