What are Dart extension methods? Implement toIntOrDefault on String.
Tests Dart extension syntax and static resolution. A strong answer defines an extension on String, uses int.tryParse with a fallback, and notes extensions do not mutate the original type. Red flag: using try-catch over tryParse or claiming dynamic dispatch.
Tests whether you understand Dart extension methods as compile-time syntactic sugar that does not mutate the original class. A strong answer writes an extension block on String, implements toIntOrDefault by calling int.tryParse and returning the provided default when the result is null, and explicitly states that resolution is static, meaning a dynamic variable will not resolve the extension method.
Read the original → dart.dev
- #dart
- #extension-methods
- #null-safety
- #static-resolution
- #string-parsing
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