positiveNumber static method

String? positiveNumber(
  1. String? value
)

Validates positive number (> 0)

Implementation

static String? positiveNumber(String? value) {
  if (value == null || value.isEmpty) {
    return 'Ingresa un número';
  }

  final number = double.tryParse(value);
  if (number == null || number <= 0) {
    return AppStrings.mustBePositive;
  }

  return null;
}