isLessThan static method

FormFieldValidator<num> isLessThan(
  1. num lessThan, {
  2. String? message,
})

Implementation

static FormFieldValidator<num> isLessThan(num lessThan, {String? message}) {
  return (num? value) {
    if (value == null) {
      return null;
    }

    if (value >= lessThan) {
      return message ?? 'Value must be less than $lessThan';
    }

    return null;
  };
}