test:zig

guide/language/defer.zig

@@ -0,0 +1,24 @@
+const expect = @import("std").testing.expect;
+
+test "defer" {
+    var x: i16 = 5;
+    {
+        defer x += 2;
+        try expect(x == 5);
+    }
+    try expect(x == 7);
+}
+
+test "multi defer" {
+    var x: f32 = 5;
+    {
+        // When there are multiple defers in a single block, they are executed in reverse order.
+        defer x += 2;
+        defer x /= 2;
+    }
+    try expect(x == 4.5);
+}
+
+// Defer is useful to ensure that resources are cleaned up when they are no longer needed.
+// Instead of needing to remember to manually free up the resource,
+// you can add a defer statement right next to the statement that allocates the resource.