Pipes-Mariana

string_manipulation.rb

@@ -1,23 +1,85 @@
 # A method to reverse a string in place.
 def string_reverse(my_string)
-  puts "NOT IMPLEMENTED"
+  i = 0
+  j = my_string.length-1
+  temp = my_string[i]
+  while i < j do
+    temp = my_string[i]
+    my_string[i] = my_string[j]
+    my_string[j] = temp
+    i += 1
+    j -=1
+  end
+ return  my_string
 end
 
 # A method to reverse each word in a sentence, in place.
 def reverse_words(my_words)
-  puts "NOT IMPLEMENTED"
+  i = 0
+  j = 0
+  while i < my_words.length do
+    while my_words[j] != " " && j < my_words.length do
+      j += 1
+    end
+    last = j-1
+    first = i
+    while first < last do
+      temp = my_words[first]
+      my_words[first] = my_words[last]
+      my_words[last] = temp
+      first += 1
+      last -= 1
+    end
+    i = j+1
+    j += 1
+  end
+  return my_words
 end
 
 # A method to reverse the words in a sentence, in place.
 def reverse_sentence(my_sentence)
-  puts "NOT IMPLEMENTED"
+  # firstfirst = 0
+  # firstlast = 0
+  # lastfirst = my_sentence.length - 1
+  # lastlast = my_sentence.length - 1
+  #
+  # while firstlast < lastfirst do
+  #   while my_sentence[firstlast] != " "
+  #     firstlast += 1
+  #   end
+  #
+  #   while my_sentence[lastlast] != " "
+  #     lastfirst -= 1
+  #   end
+  #
+  #   firstword = my_sentence[firstfirst ... firstlast]
+  #   lastword = my_sentence[lastfirst+1 .. lastlast]
+  #
+  #
+  #   my_sentence = lastword + " " + my_sentence[firstlast + 1 .. lastfirst - 1 ] + " " + firstword
+  #
+  #   firstlast = lastword.length + 1
+  #   lastfirst = my_sentence.length - (firstword.length + 2)
+  #   firstfirst = firstlast
+  #   lastlast = lastfirst
+  #
+  # end
+  #
+  # return my_sentence
+  # string_reverse(my_sentence)
+  reverse_words(string_reverse(my_sentence))
+  # return my_sentence
 end
 
 # A method to check if the input string is a palindrome.
 # Return true if the string is a palindrome. Return false otherwise.
 def palindrome_check(my_phrase)
-  puts "NOT IMPLEMENTED"
-  return true
+  # puts string_reverse(my_phrase)
+  if my_phrase.dup == string_reverse(my_phrase)
+    return true
+  else
+    return false
+  end
 end
 
 # A method that updates the string by replacing consecutive repeating characters