Dart null / false / empty checking: How to write this shorter?

Question

This is my code for true on everything but empty string, null and false:

if (routeinfo[\"no_route\"] == \"\" || routeinfo[\"no_route\"] == null || routeinfo[         


        

Answer 1

As coming from Android and Kotlin, I prefer extension methods over a static helper method. And with Dart 2.7 you can now use that as well:

extension Extension on Object {
  bool isNullOrEmpty() => this == null || this == '';

  bool isNullEmptyOrFalse() => this == null || this == '' || !this;

  bool isNullEmptyZeroOrFalse() =>
      this == null || this == '' || !this || this == 0;
}

Now you can just call these methods from anywhere in your code:

if (anyVariable.isNullOrEmpty()) {
  // do something here
}

You might need to manually import the dart class, where you put your extension methods, for example:

import 'package:sampleproject/utils/extensions.dart';