Mutation

2 articles

Go 11 Sep 2026 5 min read

Reverse Go Slices in Place with slices.Reverse

Sometimes the order stored in a slice needs to change, not just the order in which code visits its elements. A queue may need newest-first presentation, a collected path may need to run from origin to destination, or a stack snapshot may need its top element first. slices.Reverse handles that edit directly. The key detail is mutation. slices.Reverse rearranges the existing slice in place. It doesn’t return a replacement slice, and code sharing the same backing array can observe the new order.

Go Slices

Go 11 Sep 2026 5 min read

Replace a Range in Go Slices with slices.Replace

Replacing part of a slice often starts as an append expression that works but takes a moment to decode. slices.Replace gives that operation a direct name: choose the half-open range s[i:j], provide replacement values, and keep the returned slice. The replacement doesn’t have to be the same size as the removed range. It can be shorter, longer, or empty, which makes slices.Replace useful for more than one-for-one edits. Replace a slice range with slices.Replace The basic call replaces every element from index i up to, but not including, index j:

Go Slices