[Flutter/dart]LateInitializationError with late final variable

Phenomenon

There is a class like below.

class SomeClass{

  late final String? hoge;
  
  SomeClass({this.hoge}){
    hoge??= "";　//1
  }
}

If hoge is null (i.e. no value is set for the argument), I will get a lateInitialization error at point 1.

I thought it's okay to assign a value here, because it is "late"...

Cause

Since it is "initialized" at "this.hoge", subsequent value assignments will be lateInitialization, even if the value is null.

I thought that it was not initialized yet because it was not assigned if it was null.

Solution

class SomeClass{

  late final String? hoge;
  
  SomeClass({String? hoge}){
    this.hoge = hoge?? "";
  }
}