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avoid-unconditional-break

added in: 1.9.0
warning
Pro+
preset: recommended

Warns when a break, continue, return or throw are used unconditionally in a for loop.

Example​

❌ Bad:

void main() {
  final list = <int>[];

  for (final item in list) {
    continue; // LINT: Avoid unconditional break statements. This loop is always interrupted after one iteration. Try removing this statement or call it conditionally.
  }

  for (final item in list) {
    break; // LINT: Avoid unconditional break statements. This loop is always interrupted after one iteration. Try removing this statement or call it conditionally.
  }

  for (final item in list) {
    return; // LINT: Avoid unconditional break statements. This loop is always interrupted after one iteration. Try removing this statement or call it conditionally.
  }

  for (final item in list) {
    throw ''; // LINT: Avoid unconditional break statements. This loop is always interrupted after one iteration. Try removing this statement or call it conditionally.
  }
}

✅ Good:

void main() {
  final list = <int>[];

  for (final item in list) {
    if (someCondition) { // Correct, only in some cases
      continue;
    }
  }

  for (final item in list) {
    if (someCondition) {
      break;
    }
  }

  for (final item in list) {
    if (someCondition) {
      return;
    }
  }

  for (final item in list) {
    if (someCondition) {
      throw '';
    }
  }
}

Additional Resources​