number static method

String? number(
  1. String? string, {
  2. String? errorMessage,
})

Number validator.

Implementation

static String? number(String? string, {String? errorMessage}) {
  if (string == null || string.isEmpty || double.tryParse(string) != null) {
    return null;
  }
  return errorMessage ?? FieldBlocValidatorsErrors.number;
}