Is it possible to use .equals() method like Java in Dart

Question

I'm a Java developer and the newbie in Dart.

When I compare two objects in Dart, it only has == operator which helps me compare two logical memory addresses of two objects in Dart. How can I compare two objects to be the same like Java without be preparing this code below? It makes me tired to prepare entity's class so I wonder that have any Dart's ways for that?

class MyClass {
    final MySubClass mySubClass;

    MyClass({this.mySubClass});

    bool equals(Object other) => identical(this, other) || other is MyClass && runtimeType == other.runtimeType && something.equals(other.mySubClass);
}

class MySubClass {
    final String something;

    MySubClass({this.something});

    bool equals(Object other) => identical(this, other) || other is MySubClass && runtimeType == other.runtimeType && something == other.something;
}

Solution 1

Dart language don't have equals method. According this article, I have to use Equatable Package.

Solution 2

@override
  bool operator ==(Object other) =>
      identical(this, other) ||
          other is Class &&
              runtimeType == other.runtimeType &&
              id == other.property;

@override
int get hashCode => property.hashCode;

Comments

[Amit Prajapati]

You will found answer here : pchalin.blogspot.com/2014/04/…

[Trần Đức Tâm]

Thank U alot. Let me check this blog.

[rjh]

See stackoverflow.com/questions/13275506/… for a good explanation of the identical function (equivalent to Java ==) and Dart's operator== (equivalent to Java equals).

[Admin]

equatable uses same == operator

[Admin]

article quote Equatable overrides == and hashCode for you so you don’t have to waste your time writing lots of boilerplate code. so you said I have to use Equatable Package not true, you could use it but you don't have to used it

[Trần Đức Tâm]

Some one did edited my question. I want an equal method which compare the value but not memory location. :/

[Stephen Ostermiller]

A code-only answer is not high quality. While this code may be useful, you can improve it by saying why it works, how it works, when it should be used, and what its limitations are. Please edit your answer to include explanation and link to relevant documentation.