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prefer-for-in

added in: 1.24.0
style
Pro+

Suggests using for-in loop instead of the regular loop.

Example​

❌ Bad:

void fn(List<int> arr) {
  // LINT: Prefer for-in loop over the regular for loop. To access the index, use the '.indexed' property on the collection.
  for (var i = 0; i < arr.length; i += 1) {
    ...
  }
}

✅ Good:

void fn(List<int> arr) {
  for (final item in arr) {
    ...
  }

  for (final (index, item) in arr.indexed) {
    ...
  }
}