目錄
目錄

Invocation of remove with references of unrelated types.

This rule is currently deprecated and available as of Dart 2.0.0.

Rule sets: core, recommended, flutter

Details

DON’T invoke remove on List with an instance of different type than the parameter type.

Doing this will invoke == on its elements and most likely will return false.

BAD:

void someFunction() {
  var list = <int>[];
  if (list.remove('1')) print('someFunction'); // LINT
}

BAD:

void someFunction3() {
  List<int> list = <int>[];
  if (list.remove('1')) print('someFunction3'); // LINT
}

BAD:

void someFunction8() {
  List<DerivedClass2> list = <DerivedClass2>[];
  DerivedClass3 instance;
  if (list.remove(instance)) print('someFunction8'); // LINT
}

BAD:

abstract class SomeList<E> implements List<E> {}

abstract class MyClass implements SomeList<int> {
  bool badMethod(String thing) => this.remove(thing); // LINT
}

GOOD:

void someFunction10() {
  var list = [];
  if (list.remove(1)) print('someFunction10'); // OK
}

GOOD:

void someFunction1() {
  var list = <int>[];
  if (list.remove(1)) print('someFunction1'); // OK
}

GOOD:

void someFunction4() {
  List<int> list = <int>[];
  if (list.remove(1)) print('someFunction4'); // OK
}

GOOD:

void someFunction5() {
  List<ClassBase> list = <ClassBase>[];
  DerivedClass1 instance;
  if (list.remove(instance)) print('someFunction5'); // OK
}

abstract class ClassBase {}

class DerivedClass1 extends ClassBase {}

GOOD:

void someFunction6() {
  List<Mixin> list = <Mixin>[];
  DerivedClass2 instance;
  if (list.remove(instance)) print('someFunction6'); // OK
}

abstract class ClassBase {}

abstract class Mixin {}

class DerivedClass2 extends ClassBase with Mixin {}

GOOD:

void someFunction7() {
  List<Mixin> list = <Mixin>[];
  DerivedClass3 instance;
  if (list.remove(instance)) print('someFunction7'); // OK
}

abstract class ClassBase {}

abstract class Mixin {}

class DerivedClass3 extends ClassBase implements Mixin {}

DEPRECATED: This rule is deprecated in favor of collection_methods_unrelated_type. The rule will be removed in a future Dart release.

Usage

To enable the list_remove_unrelated_type rule, add list_remove_unrelated_type under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - list_remove_unrelated_type