Karis - Edges - Palindrom Check

lib/palindrome_check.rb

@@ -1,5 +1,43 @@
 # 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)
-  raise NotImplementedError
+  return false if !my_phrase
+  return true if my_phrase == ""
+  return true if my_phrase.length == 1
+
+  min = 0
+  max = my_phrase.length - 1
+  check = false
+
+# first check if string is empty or not
+# if not empty then compare the pair
+# if at least one of them is empty then move onto next index until it is not empty
+# then compare
+# if match continue moving up the index until min > max
+# if at least one pair that does not match then return false for good
+
+
+  until min > max
+    # unless my_phrase[min] == " " || my_phrase[max] == " "
+    until my_phrase[min] != " "
+      min += 1
+    end
+
+    until my_phrase[max] != " "
+      max -= 1
+    end
+
+    if my_phrase[min] == my_phrase[max]
+      check = true
+    else
+      return false
+    end
+    # end
+
+    min += 1
+    max -= 1
+    # require 'pry'; binding.pry
+  end
+
+  return check
 end

specs/palindrome_check_spec.rb

@@ -11,12 +11,14 @@
     end
 
     it "palindrome input with even character count" do
+
       test_string = "redder"
 
       palindrome_check(test_string).must_equal true
     end
 
     it "not a palindrome" do
+
       test_string = "empty"
 
       palindrome_check(test_string).must_equal false
@@ -27,37 +29,43 @@
   describe "edge cases" do
     # if it's a string parameter, check for empty
     it "empty string reads the same backwards or forwards" do
+
       test_string = ""
 
       palindrome_check(test_string).must_equal true
     end
 
     # if the parameter is an object, check for nil
     it "nil object is not a string" do
+
       test_string = nil
 
       palindrome_check(test_string).must_equal false
     end
 
     it "palindrome with spaces to ignore" do
+
       test_string = "nurses run"
 
       palindrome_check(test_string).must_equal true
     end
 
     it "palindrome with multiple spaces to ignore" do
+
       test_string = " pull   up "
 
       palindrome_check(test_string).must_equal true
     end
 
     it "not a palindrome, with spaces" do
+
       test_string = " not in  "
 
       palindrome_check(test_string).must_equal false
     end
 
     it "single character is a palindrome" do
+
       test_string = "A"
 
       palindrome_check(test_string).must_equal true