MapValidator<T extends Map> class abstract

Abstract class from which to create class based validator schemes. EskMap is a utility class designed to facilitate the validation and transformation of map-like data structures in Dart. It provides a flexible way to define validation rules and apply them to input data, ensuring that the data conforms to expected formats or constraints.

This is particularly useful when working with dynamic data sources such as JSON, form inputs, or external APIs, where the structure and types of the data may not be guaranteed.

Example:

class UserValidator extends EskMap {
  final name = EskField(
    id: 'name',
    validators: [ $isString ],
  );
  final age = EskField(
    id: 'age',
    validators: [ $isInt, $isGt(0) ],
  );
  @override
  get fields => [name, age];
}

final userValidator = UserValidator();

final result = userValidator.validate({
  'name': 'Alice',
  'age': 30
});

if (result.isValid) {
  print('Validation passed!');
} else {
  print(result.toString());
}

In this example, EskMap is used to define a schema where name is a required string and age is an integer with a minimum value of 0. The validate method checks the input data against these rules and returns the result.