Initialize an Instance with Type in Dart

Question

Assume I have some Type instances:

final strType = String;
final intType = int;

I want to initialize instances of the Types, for example, preferably,

final myString = strType(); // myString is String()

or

final myInt = new intType(); // myInt is int()

However, the compiler raised an error of strType isn't a function.

Is it possible to initialize an instance of a Type in Dart?

Nate Bosch · Accepted Answer · 2019-03-09 17:35:14Z

2

This is not possible at the language level. It is possible with reflection, but the code will be complex and to use it on the web or flutter it would require codegen.

Instead of assigning a Type to a variable, consider assigning a function type. () => SomeClassName() is an anonymous function that can create an instance of SomeClassName.

answered Mar 9, 2019 at 17:35

Nate Bosch

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