Space - Stephanie

lib/array_intersection.rb

@@ -1,3 +1,3 @@
 def intersection(list1, list2)
-  raise NotImplementedError, "Intersection not implemented"
+  intersect = list1 & list2
 end

lib/palindrome_permutation.rb

@@ -1,4 +1,17 @@
 
 def palindrome_permutation?(string)
-  raise NotImplementedError, "palindrome_permutation? not implemented"
-end
+
+  letter_hash = {}
+  string.chars.map do |char|
+    letter_hash["#{char}"] = string.count(char)
+  end
+
+  odd_count = 0
+  letter_hash.each do |key, value|
+    value.odd? ? (odd_count += 1) : next
+  end
+
+  odd_count > 1 ? (return false) : (return true) 
+
+end
+

lib/permutations.rb

@@ -1,4 +1,14 @@
 
 def permutations?(string1, string2)
-  raise NotImplementedError, "permutations? not implemented"
+  return false if string1.length != string2.length
+
+  string1.chars.each do |char|
+    if string2.include?(char)
+      string1.slice!(char)
+      string2.slice!(char)
+    end
+  end
+
+  return true if string1.empty? && string2.empty?
+  return false  
 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
@@ -13,7 +13,7 @@
     expect(permutations?("pasta", "atsap")).must_equal true
   end
 
-  it "returns true for 'pizza', 'pizza'" do
+  it "returns false for 'pizza', 'pasta'" do
     expect(permutations?("pizza", "pasta")).must_equal false
   end