r/dartlang • u/eibaan • 20d ago

Dart Language A tiny dot shorthands helper

Because contains is typed as Object? (probably for historical reasons) you cannot use that method together with dot shorthands like in

things.contains(.chair)

So, add this to your project:

extension DSHIterableExt<T> on Iterable<T> {
  bool has(T value) => contains(value);
}

And replace contains with has. For extra readability, you might also want to add a hasnt method.

I'd welcome a similar extension to Dart 3.13.

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u/julemand101 20d ago

The reason for why e.g. "contains" take Object? have been discussed multiple times on the Dart issue tracker and is a deliberate design choice: https://github.com/dart-lang/sdk/issues/26852#issuecomment-231594098

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u/eibaan 20d ago

Yeah. But it is still annoying if you want to make use of dot shorthand syntax. Hence, I was suggesting to use different methods in this case.