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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7.     public static Func<string,bool> MinimumLength(int _minLength)
  8.     {
  9.         return (password) =>
  10.             password != null
  11.             && password.Length >= _minLength;
  12.     }
  13.  
  14.     public static bool MustHaveDigits(string password)
  15.     {
  16.         if (password == null) return false;
  17.         return password.ToCharArray().Any(c => char.IsDigit(c));
  18.     }
  19.  
  20.     public static bool MustHaveUppercase(string password)
  21.     {
  22.         if (password == null) return false;
  23.         return password.ToCharArray().Any(c => char.IsUpper(c));
  24.     }
  25.  
  26.  
  27.     public static void Main()
  28.     {
  29.         Func<IEnumerable<Func<string,bool>>, Func<string, bool>> createPasswordPolicy = (policy) => (pw) => policy.All(check => check(pw));
  30.  
  31.         var isValidShort = createPasswordPolicy(new List<Func<string, bool>>() {
  32.         	Test.MinimumLength(8),
  33.         	Test.MustHaveDigits,
  34.         	Test.MustHaveUppercase,
  35.         });
  36.  
  37.         var isValidLong = createPasswordPolicy(new List<Func<string, bool>>() {
  38.         	Test.MinimumLength(10),
  39.         	Test.MustHaveDigits,
  40.         	Test.MustHaveUppercase,
  41.         });
  42.  
  43.  
  44.         System.Console.WriteLine(isValidShort("Password1"));   // True
  45.         System.Console.WriteLine(isValidShort("Password123")); // True
  46.         System.Console.WriteLine(isValidShort(null));          // False
  47.         System.Console.WriteLine(isValidShort(""));            // False
  48.  
  49.         System.Console.WriteLine(isValidLong("Password123"));  // True
  50.         System.Console.WriteLine(isValidLong("Password1"));    // False
  51.         System.Console.WriteLine(isValidLong(null));           // False
  52.         System.Console.WriteLine(isValidLong(""));             // False
  53.     }
  54.  
  55. }
Success #stdin #stdout 0s 131520KB
comments (?)
stdin 
Standard input is empty
stdout 
True
True
False
False
True
False
False
False
https://ideone.com/3Savt9
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
public

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