sleepy_coder

Chris_Ching's_Swift_Chalange_03

May 26th, 2019
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  1. //
  2. // CodeWithChris Learn Swift for Beginners
  3. // http://codewithchris.com/learn-swift
  4. //
  5. // Challenge #3: The Library Challenge
  6. //
  7. // Instructions:
  8. // Complete the class definition so that you get the expected output in the console(specified below the class definitions). See TODOs.
  9. //
  10.  
  11. class Person {
  12.  
  13.     var name:String!
  14.  
  15.     init(_ fullName:String) {
  16.         name = fullName
  17.     }
  18. }
  19.  
  20.  
  21. //let newPerson = Person("Sebet")
  22.  
  23.  
  24.  
  25. class Book {
  26.  
  27.     var title:String!
  28.     var author:String!
  29.  
  30.     init(_ bookTitle:String, _ bookAuthor:String) {
  31.         title = bookTitle
  32.         author = bookAuthor
  33.     }
  34.  
  35. }
  36.  
  37. //let newBook = Book("The Adventures of Tom Soyare", "Samuel Longhorn Clemens")
  38.  
  39. // --- Your code goes below this line ---
  40.  
  41. class Library {
  42.  
  43.     var catalogue = ["ORW":Book("1985", "George Orwell"), "RAY":Book("Fahrenheit 451", "Ray Bradbury")]
  44.     var checkedOutBooks = [String:Person]()
  45.  
  46.     func searchByTitle(_ title:String) -> String {
  47.  
  48.         // TODO: This function searches the catalogue dictionary for a title
  49.         //
  50.         // Returns "Available" if the book exists and isn't checked out
  51.         //
  52.         // Returns "Checked out by name" if the book exists and is checked out
  53.         //
  54.         // Returns "Not in catalogue" if the book doesn't exist
  55.  
  56.         for item in catalogue {
  57.             if item.value.title.lowercased() == title.lowercased() && checkedOutBooks[item.key] == nil {
  58.                 return "Available"
  59.             } else if item.value.title.lowercased() == title.lowercased() && checkedOutBooks[item.key] != nil {
  60.                 return "Checked out by " + (String)(checkedOutBooks[item.key]?.name ?? "nobody")
  61.             }
  62.         }
  63.  
  64.         return "Not in catalogue"
  65.     }
  66.  
  67.     func checkOut(_ bookId:String, _ person:Person) -> String {
  68.  
  69.         // TODO: This function adds to the checkedOutBooks dictionary
  70.         //
  71.         // Returns "Error: Book already checked out" if the book is already in the checkedOutBooks dictionary
  72.         //
  73.         // Returns "Successfully checked out" and adds the bookId,person key-value pair if the book doesn't currently exist in the checkedOutbooks dictionary
  74.         //
  75.         // Returns "Book doesn't exist" if the book isn't in the catalogue dictionary
  76.  
  77.         if catalogue[bookId] != nil {
  78.             if checkedOutBooks[bookId] != nil {
  79.                 return "Error: Book already checked out"
  80.             } else if checkedOutBooks[bookId] == nil  {
  81.                 checkedOutBooks[bookId] = person
  82.                 return "Successfully checked out"
  83.             }
  84.         }
  85.  
  86.         return "Book doesn't exist"
  87.     }
  88.  
  89.     func checkIn(_ bookId:String) -> String {
  90.  
  91.         // TODO: This function removes the bookId,person key-value pair from the checkedOutBooks dictionary
  92.         //
  93.         // Returns "Book doesn't exist" if the book isn't in the catalogue dictionary
  94.         //
  95.         // Returns "Error: Can't check in a book that hasn't been checked out" if the book wasn't checked out in the first place
  96.         //
  97.         // Returns "Successfully checked in"
  98.  
  99.         if catalogue[bookId] != nil {
  100.             if checkedOutBooks[bookId] != nil {
  101.                 checkedOutBooks.removeValue(forKey: bookId)
  102.                 return "Successfully checked in"
  103.             } else if checkedOutBooks[bookId] == nil  {
  104.                 return "Error: Can't check in a book that hasn't been checked out"
  105.             }
  106.         }
  107.  
  108.         return "Book doesn't exist"
  109.     }
  110.  
  111. }
  112. // --- Your code goes above this line ---
  113.  
  114. // --- Don't edit or add anything below this line ---
  115.  
  116. let lib = Library()
  117. let borrower1 = Person("Curious George")
  118. let borrower2 = Person("Mark Twain")
  119.  
  120. // George searches for a book
  121. let searchResult = lib.searchByTitle("1985")
  122. print(searchResult)
  123.  
  124. // Expected Output in console:
  125. // "Available"
  126.  
  127. // George checks out the book
  128. let borrowResult = lib.checkOut("ORW", borrower1)
  129. print(borrowResult)
  130.  
  131. // Expected Output in console:
  132. // "Successfully checked out"
  133.  
  134. // Mark searches for a book
  135. let searchResult2 = lib.searchByTitle("1985")
  136. print(searchResult2)
  137.  
  138. // Expected Output in console:
  139. // "Checked out by Curious George"
  140.  
  141. // Mark tries to borrow a book that's already checked out
  142. let borrowResult2 = lib.checkOut("ORW", borrower2)
  143. print(borrowResult2)
  144.  
  145. // Expected Output in console:
  146. // "Error: Book already checked out"
  147.  
  148. // A book is checked in
  149. let checkInResult = lib.checkIn("RAY")
  150. print(checkInResult)
  151.  
  152. // Expected Output in console:
  153. // "Error: Can't check in a book that hasn't been checked out"
  154.  
  155. // George checks in his book
  156. let checkInResult2 = lib.checkIn("ORW")
  157. print(checkInResult2)
  158.  
  159. // Expected Output in console:
  160. // "Successfully checked in"
  161.  
  162. // Mark attempts to borrow the book again
  163. let borrowResult3 = lib.checkOut("ORW", borrower2)
  164. print(borrowResult3)
  165.  
  166. // Expected Output in console:
  167. // "Successfully checked out"
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