🍰 Go Slices Finally Explained: Why They Behave the Way They Do

Ever wondered why appending to one slice suddenly mutates another? Or why your nil vs empty slice checks sometimes bite back?

In Go, a slice isn’t magic — it’s just a tiny descriptor:
•a pointer to data,
•its length,
•and its capacity.
That leads to some gotchas (shared arrays, silent reallocations) — but also powerful tricks:
✅ Safe in‑place compaction
✅ O(1) element removal (if order doesn’t matter)
✅ Guaranteed slice isolation with the full slice expression (:len:len)

👉 Full breakdown with practical code:
https://levelup.gitconnected.com/understand-go-slices-once-and-for-all-2025-e146d05eb2b6