iterable_contains_unrelated_type
呼叫 Iterable<E>.contains 時使用了不相關的型別引用。
詳情
#注意：此規則在 Dart 3.3.0 中已移除；它不再起作用。
不要 在 Iterable 上使用與其引數型別不同的例項呼叫 contains。
這樣做會在其元素上呼叫 ==，並且很可能返回 false。
不推薦
dart
void someFunction() {
var list = <int>[];
if (list.contains('1')) print('someFunction'); // LINT
}不推薦
dart
void someFunction3() {
List<int> list = <int>[];
if (list.contains('1')) print('someFunction3'); // LINT
}不推薦
dart
void someFunction8() {
List<DerivedClass2> list = <DerivedClass2>[];
DerivedClass3 instance;
if (list.contains(instance)) print('someFunction8'); // LINT
}不推薦
dart
abstract class SomeIterable<E> implements Iterable<E> {}
abstract class MyClass implements SomeIterable<int> {
bool badMethod(String thing) => this.contains(thing); // LINT
}推薦
dart
void someFunction10() {
var list = [];
if (list.contains(1)) print('someFunction10'); // OK
}推薦
dart
void someFunction1() {
var list = <int>[];
if (list.contains(1)) print('someFunction1'); // OK
}推薦
dart
void someFunction4() {
List<int> list = <int>[];
if (list.contains(1)) print('someFunction4'); // OK
}推薦
dart
void someFunction5() {
List<ClassBase> list = <ClassBase>[];
DerivedClass1 instance;
if (list.contains(instance)) print('someFunction5'); // OK
}
abstract class ClassBase {}
class DerivedClass1 extends ClassBase {}推薦
dart
void someFunction6() {
List<Mixin> list = <Mixin>[];
DerivedClass2 instance;
if (list.contains(instance)) print('someFunction6'); // OK
}
abstract class ClassBase {}
abstract class Mixin {}
class DerivedClass2 extends ClassBase with Mixin {}推薦
dart
void someFunction7() {
List<Mixin> list = <Mixin>[];
DerivedClass3 instance;
if (list.contains(instance)) print('someFunction7'); // OK
}
abstract class ClassBase {}
abstract class Mixin {}
class DerivedClass3 extends ClassBase implements Mixin {}啟用
#要啟用 iterable_contains_unrelated_type 規則，請在你的 analysis_options.yaml 檔案中的 linter > rules 下新增 iterable_contains_unrelated_type
analysis_options.yaml
yaml
linter:
rules:
- iterable_contains_unrelated_type如果你使用的是 YAML 對映語法來配置 Linter 規則，請在 linter > rules 下新增 iterable_contains_unrelated_type: true
analysis_options.yaml
yaml
linter:
rules:
iterable_contains_unrelated_type: true