lean into examples

examples/errors/errors.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+    "errors"
+    "fmt"
+)
+
+func myFun(arg int) (int, error) {
+    if arg == 42 {
+        return -1, errors.New("Can't work with 42")
+
+    }
+    return arg + 3, nil
+}
+
+func main() {
+    r, _ := myFun(7)
+    fmt.Println(r)
+
+    _, e := myFun(42)
+    fmt.Println(e)
+}
+
+// todo: custom errors
+// todo: data conveying errors