https://nalar.dev/tags/maps/ Recent content in Maps on Nalar Hugo en-us Thu, 10 Sep 2026 00:00:00 +0700 https://nalar.dev/copy-go-maps-with-maps-clone-without-sharing-top-level-state/ Thu, 10 Sep 2026 00:00:00 +0700 https://nalar.dev/copy-go-maps-with-maps-clone-without-sharing-top-level-state/ <p>Copying a Go map is easy to get subtly wrong. Assigning one map variable to another doesn&rsquo;t duplicate the map, so a write through either variable changes the same underlying map. Since Go 1.21, the standard library&rsquo;s <code>maps.Clone</code> function gives you a concise way to make a separate top-level map.</p> <p>There is one boundary worth understanding before using it: <code>maps.Clone</code> is a <strong>shallow</strong> clone. Adding, deleting, or replacing entries in the clone won&rsquo;t change the original map, but nested maps, slices, pointers, and other reference-bearing values can still refer to the same underlying data.</p>