WebThe Dart language is type safe: it uses a combination of static type checking and runtime checks to ensure that a variable’s value always matches the variable’s static type, sometimes referred to as sound typing. Although types are mandatory, type annotations are optional because of type inference.

Get the name of a Dart class as a Type or String

WebJul 11, 2024 · You can use the keyword is or switch over runtimeType : dynamic foo = 42; if (foo is int) { print ("Hello"); } switch (foo.runtimeType) { case int: { print ("World"); } } Consider using is instead of directly using runtimeType. As is works with subclasses. While using runtimeType is a strict comparison. Share Improve this answer Follow WebSep 18, 2024 · Dart sees List as List in your example and will therefore make the type of the list to also contain dynamic: List a = [1]; print (a is List); // prints false print (a.runtimeType); // List But if you instead do let Dart automatically assign the type of the variable like: c and m sports

Dart object - working with objects in Dart language - ZetCode

WebJul 9, 2024 · You can't do type checks using Type objects in Dart. A Type object is not the type, it's just a token representing the type which can be used with the dart:mirrors reflection library. It cannot, really, be used for anything else. WebFeb 2, 2024 · There is a way to check whether one type is a subtype of another, and it does use the is operator, but you need to have an instance as the first operand and a type as the second. You can't just create an instance of an unknown type, so we instead rely in Dart's covariant generics: bool isSubtype () => [] is List; WebJun 9, 2013 · I have the following form of assignment & null checks to avoid double lookups in my maps. Is there a better or more idiomatic way to do this in Dart? bool isConnected(a, b){ List list; ret... can dmt heal you