integer static method

String? integer(
  1. String? value, {
  2. String? message,
})

Validates integer value

Example:

Validators.integer('123');

Implementation

static String? integer(String? value, {String? message}) {
  if (value == null || value.isEmpty) return null;
  if (int.tryParse(value) == null) {
    return message ?? 'Please enter a valid integer';
  }
  return null;
}