static constructor in Dart

Question

How to write static constructor in Dart?

class Generator
{
   static List<Type> typesList = [];

   //static
   //{ /*static initializations*/}

}

Answer 1

static initialization block

In Dart there is no equivalent to the Java static initialization block.
However, an easy workaround for most cases is extracting the static initialization logic to a static function.

class Dummy {
  static final Map<int, String> someValues = _createSomeValues();

  static Map<int, String> _createSomeValues() {
    Map<int, String> someValues = {};
    for (var i = 0; i <= 10; i++) {
      someValues[i] = "$i";
    }
    return someValues;
  }
}

Note that the static variable is initialized lazily as described in https://groups.google.com/a/dartlang.org/forum/#!topic/misc/dKurFjODRXQ. However, this behavior should never impact you with normal/clean code.

static method as factory

If you meant named constructors by 'static constructor' take a look at the following answer: https://stackoverflow.com/a/59811076/1218254