validationFromName function
Returns the provided ValidationRule with the given name
, if any
Implementation
ValidationRule? validationFromName(String name) {
if (name.isEmpty) return null;
final _rule = name.endsWith('Rule') ? '' : 'Rule';
final _name =
'${name.substring(0, 1).toLowerCase()}${name.substring(1)}$_rule';
return _allValidationRules[_name];
}