Time - Denisse

lib/array_intersection.rb

@@ -1,3 +1,17 @@
 def intersection(list1, list2)
-  raise NotImplementedError, "Intersection not implemented"
+
+  hash = {}
+  result = []
+
+  list1.each do |number|
+    hash[number] = true
+  end
+
+  list2.each do |number|
+    if !hash[number].nil?
+      result << number
+    end
+  end
+
+  return result
 end

lib/palindrome_permutation.rb

@@ -1,4 +1,23 @@
-
 def palindrome_permutation?(string)
-  raise NotImplementedError, "palindrome_permutation? not implemented"
-end
+
+  hash = {}
+  count = 0
+
+  word = string.split("")
+
+  word.each do |letter|
+    hash[letter] = 0  
+  end
+
+  word.each do |letter|
+    if hash[letter]
+      hash[letter] += 1
+    end 
+
+    if hash[letter] % 2 == 0
+      count += 1 
+    end 
+  end
+
+  return count == word.length/2
+end 

lib/permutations.rb

@@ -1,4 +1,7 @@
-
 def permutations?(string1, string2)
-  raise NotImplementedError, "permutations? not implemented"
+
+  first = string1.split("")
+  second = string2.split("")
+
+  return first.sort == second.sort
 end

test/palindrome_permutation_test.rb

@@ -1,6 +1,6 @@
 require_relative "test_helper"
 
-xdescribe "palindrome_permutation?" do
+describe "palindrome_permutation?" do
   it "will work for hello" do
     expect(palindrome_permutation?("hello")).must_equal false
   end

test/permutations_test.rb

@@ -1,6 +1,6 @@
 require_relative "test_helper"
 
-xdescribe "permutations?" do
+describe "permutations?" do
   it "returns true for empty string" do
     expect(permutations?("", "")).must_equal true
   end