length method

JarString length(
  1. int exactLength, [
  2. String? message
])

Implementation

JarString length(int exactLength, [String? message]) {
  return addValidator((value) {
    if (value == null) return null;
    return value.length == exactLength
        ? null
        : (message ?? 'Must be exactly $exactLength characters');
  }, 'invalid_length');
}