validation_chain 0.0.3

Validation Chain API.

Validation Chain

A validation chain api to use with TextFormField or Backend applicaitons made with dart.

Usage

Backend applications

import 'package:validation_chain/validation_chain.dart';

String? compulsory(String? value) {
  return value != null && value.isEmpty ? 'Required' : null;
}

String? tooShort(String? value) {
  return value != null && value.length < 5 ? 'Too Short' : null;
}

String? tooLong(String? value) {
  return value != null && value.length > 10 ? 'Too Long' : null;
}

final validationChain = ValidationChain([
    compulsory,
    tooShort,
    tooLong,
]);
    
validationChain.validate('');               // 'Required'
validationChain.validate('Hey');            // 'Too Short'
validationChain.validate('Hello');          // null
validationChain.validate('Hello World');    // 'Too Long'