Unhandled Exception: Stack Overflow in Enum

[denisnadey]

This is a Dart code that defines an enumeration type Planet. Each value in the enumeration corresponds to a planet and has an associated title. The mercury(), venus(), and earth() values do not have a title specified, so their name is used as the default title. The uranus(title: 'Uranus') value has a specified title of 'Uranus'.

The const Planet() constructor takes an optional title parameter and initializes the title field. The name getter returns the title if it's not empty, otherwise, it returns the default name of the planet.

The main() function prints the name of the last value in the Planet.values list using the name getter. In this case, the last value is neptune, so the output will be 'neptune'.

Overall, this code defines an enumeration of planets and demonstrates how to use it to retrieve the name of the last planet based on its associated title.

import 'dart:core';

enum Planet {
  mercury(),
  venus(),
  earth(),
  uranus(title: 'Uranus'),
  neptune();

  const Planet({
    this.title = "",
  });

  final String title;

  String get name => this.title.isEmpty ? this.name : this.title;
}

void main() {
  print(Planet.values.last.name);
}

logs:
➜ sandbb dart main.dart
Unhandled exception:
Stack Overflow
#0 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:3)
#1 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#2 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#3 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#4 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#5 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#6 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#7 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#8 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#9 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#10 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#11 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#12 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#13 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#14 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#15 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#16 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#17 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#18 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#19 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#20 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#21 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)
#22 Planet.name (file:///Users/denisnadey/Desktop/sandbb/main.dart:16:48)

[eernstg]

The invocation of the getter name in the declaration of name is an infinite loop. My guess is that you intended to invoke the extension getter name instead. You can do this by resolving the extension getter invocation explicitly: use EnumName(this).name rather than name.

enum Planet {
  mercury(),
  venus(),
  earth(),
  uranus(title: 'Uranus'),
  neptune();

  const Planet({
    this.title = "",
  });

  final String title;

  String get name => title.isEmpty ? EnumName(this).name : title;
}

void main() {
  print(Planet.values.last.name);
}

[eernstg]

I'll close the issue because it is working as intended.

[denisnadey]

wow, omg. I am sorry for this issue

[eernstg]

Oh, no problem, do keep asking/commenting when you see something surprising!