Metadata

ID: dart-code-quality/prefer-is-empty

Language: Dart

Severity: Notice

Category: Code Style

Description

Comparing a collection’s .length to zero (e.g. list.length == 0) is less readable and may be slower than calling .isEmpty or .isNotEmpty directly. Use .isEmpty when checking for zero length and .isNotEmpty when checking for non-zero length.

Non-Compliant Code Examples

void main() {
  var list = [];
  if (list.length == 0) {}
  if (list.length != 0) {}
  if (list.length > 0) {}
  if (0 == list.length) {}
  if (0 != list.length) {}
}

Compliant Code Examples

void main() {
  var list = [];
  if (list.isEmpty) {}
  if (list.isNotEmpty) {}
  if (list.length == 1) {}
  if (list.length > 1) {}
}

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