Flutter(Dart) 中方法的默认返回类型是什么？

Question

If I don't write any return type in method of Flutter then which is default return type ? For Example

getMyValue(){

}

Answer 1

默认返回类型是dynamic

Answer 2

In general, the type of something that isn't explicitly specified and that isn't inferred is dynamic .

Examples:

var x; // Same as `dynamic x`
List listOfDynamic; // Same as `List<dynamic>`
var anotherListOfDynamic = [];
var mapOfDynamicToDynamic = {}; // Same as `Map<dynamic, dynamic>`

foo(x) { } // Same as `dynamic foo(dynamic x)`

If you're in doubt, if enter some code https://dartpad.dartlang.org/ , moving the text cursor next to an identifier will tell you what it is.

Answer 3

First, it tries to infer the type, and only if it fails it uses the dynamic type. Please read the docs on Type inference