optimizations

internal/builtins/len.go

@@ -23,6 +23,9 @@ func Len(ctx context.Context, args ...object.Object) object.Object {
 	case *object.Hash:
 		return object.Integer{Value: int64(obj.Len())}
 	default:
+		if obj == nil {
+			return newError("TypeError: object is nil")
+		}
 		return newError("TypeError: object of type '%s' has no len()", args[0].Type())
 	}
 }