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avoid-multi-assignment

added in: 1.17.0
warning
Pro+
preset: recommended

Warns when multiple variable assignments are placed on the same line.

Multiple assignments on the same line can lead to confusion or indicate an incorrect operator (= instead of ==).

Example​

❌ Bad:

class SomeClass {
  String someString = 'some';
  String another = 'another';

  void update(String str) {
    someString = another = str; // LINT: Avoid multi assignments. Try moving each assignment to its own line.

    final instance = SomeClass();
    instance.another = someString = str; // LINT: Avoid multi assignments. Try moving each assignment to its own line.
  }
}

✅ Good:

class SomeClass {
  String someString = 'some';
  String another = 'another';

  void update(String str) {
    someString = str; // Correct, on separate lines
    another = str;
  }
}

Additional Resources​