quin - time

lib/array_intersection.rb

@@ -1,3 +1,13 @@
 def intersection(list1, list2)
-  raise NotImplementedError, "Intersection not implemented"
-end
+  hash = {}
+  array = []
+  list1.each do |num|
+    hash[num] = true
+    list2.each do |num2|
+      if hash[num2] 
+        array << num2
+      end 
+    end
+  end 
+  return array.uniq 
+end

lib/palindrome_permutation.rb

@@ -1,4 +1,18 @@
 
 def palindrome_permutation?(string)
-  raise NotImplementedError, "palindrome_permutation? not implemented"
-end
+  hash = {}
+  count = 0
+  string_array = string.split("")
+  string_array.each do |char|
+    hash[char] = 0  
+  end
+  string_array.each do |char|
+    if hash[char]
+      hash[char] += 1
+    end 
+    if hash[char] % 2 == 0
+      count += 1 
+    end 
+  end
+    return count == string_array.length/2
+end 

lib/permutations.rb

@@ -1,4 +1,21 @@
 
 def permutations?(string1, string2)
-  raise NotImplementedError, "permutations? not implemented"
-end
+  hash = {}
+  if string1.length != string2.length 
+    return false
+  end 
+  count = 0
+  string1 = string1.split("")
+  string2 = string2.split("")
+  hash = {}
+  string1.each do |char|
+    hash[char] = true 
+  end 
+  string2.each do |char2|
+    if !hash[char2]
+      return false
+    end 
+  end
+  return true
+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