How to reference another file in Dart?

Question

I know you can use the library, import and even #import, but which is correct?

I have got two files, MainClass.dart

Answer 1

Importing your own created libraries: You will be importing the filename.dart and not the name of your library. So if the name of your library is: myLib and it is saved in the file: someDartFile.dart you will have to

import 'someDartFile.dart';

If you have on Windows a library at: K:\SomeDir\someFile.dart you will need to write:

import '/K:/SomeDir/someFile.dart';

example:

import 'LibraryFile.dart'; //importing myLib

void main(){ 
  //a class from myLib in the LibraryFile.dart file
  var some = new SomeClassFromMyLibrary(); 
}

myLib in LibraryFile.dart:

library myLibrary;
import 'dart:math';

class SomeClassFromMyLibrary{
  String _str = "this is some private String only to myLibrary";
  String pubStr = "created instances of this class can access";
}

Here a full example.

//TestLib.dart
import 'LibFile.dart'; //SomeLibrary

void main() {
  print("Hello, World!");

  LibFile l = new LibFile();
  print(l.publicString);//public
  print(l.getPrivateString);//private  
  print(l.getMagicNumber); //42
}

//LibFile.dart
library SomeLibrary;
part 'LibFile2.dart';

class LibFile {
  String _privateString = "private";
  String publicString = "public";

  String get getPrivateString => _privateString;

  int get getMagicNumber => new LibFile2().number;
}

//LibFile2.dart
part of SomeLibrary;

class LibFile2 {
  int number = 42;
}