https://nalar.dev/tags/go-1.21/ Recent content in Go 1.21 on Nalar Hugo en-us Thu, 10 Sep 2026 00:00:00 +0700 https://nalar.dev/find-the-first-matching-slice-element-with-slices-indexfunc/ Thu, 10 Sep 2026 00:00:00 +0700 https://nalar.dev/find-the-first-matching-slice-element-with-slices-indexfunc/ <p>Searching a slice is easy when the element itself is comparable and you already know the exact value. Real programs often need something slightly different: the first queued job, the first expired token, or the first record whose normalized name matches some input.</p> <p><code>slices.IndexFunc</code> handles that case directly. You provide a predicate, and it returns the index of the first element for which that predicate is true. If nothing matches, it returns <code>-1</code>.</p>