lean into examples

examples/ok-guards/ok-guards.go

@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+func main() {
+    x := make(map[string]string)
+    x["here"] = "yes"
+
+    if name, ok := x["?"]; ok {
+        fmt.Println(name)
+    } else {
+        fmt.Println("miss")
+    }
+
+    if name, ok := x["here"]; ok {
+        fmt.Println(name)
+    }
+}
+
+// todo: note about use with errors