validate method

@override bool validate(dynamic value, [ List<String>? options ])

Validates whether the provided value is within the options list.

The value parameter is the value to be validated. The options parameter is an optional list of allowed values. Returns true if value is in options, otherwise false.

Implementation

@override
bool validate(dynamic value, [List<String>? options]) {
  // If no options are provided, validation fails.
  if (options == null) return false;
  // Check if the value (converted to a string) is in the list of options.
  return options.contains(value.toString());
}