Avoid unused parameters

Rule id

avoid-unused-parameters

Severity

Warning

Description

Checks for unused parameters inside a function or method body. For overridden methods suggests renaming unused parameters to _, __, etc.

Note: abstract classes are completely ignored by the rule to avoid redundant checks for potentially overridden methods.

Example

Bad:

void someFunction(String s) { // LINT
  return;
}

class SomeClass {
  void method(String s) { // LINT
    return;
  }
}

class SomeClass extends AnotherClass {
  @override
  void method(String s) {} // LINT
}

Good:

void someOtherFunction() {
  return;
}

class SomeOtherClass {
  void method() {
    return;
  }
}

void someOtherFunction(String s) {
  print(s);
  return;
}

class SomeOtherClass {
  void method(String s) {
    print(s);
    return;
  }
}

class SomeOtherClass extends AnotherClass {
  @override
  void method(String _) {}
}

abstract class SomeOtherClass {
  void method(String s);
}