https://nalar.dev/tags/interfaces/ Recent content in Interfaces on Nalar Hugo en-us Thu, 03 Sep 2026 00:00:00 +0700 https://nalar.dev/understand-nil-interface-values-in-go/ Thu, 03 Sep 2026 00:00:00 +0700 https://nalar.dev/understand-nil-interface-values-in-go/ <p>A Go program can print an error that looks empty, enter an <code>if err != nil</code> branch, and still be holding a nil pointer underneath. This behavior surprises developers because it seems to violate the simple rule that &ldquo;nil means no value.&rdquo;</p> <p>The rule is still consistent. The missing piece is that an <strong>interface value has two parts</strong>: a dynamic type and a dynamic value. An interface is <code>nil</code> only when neither part is set.</p>