Finished all exercises

Arrays/Exercise_Implement_Array_Flatten.rb

@@ -1,6 +1,7 @@
 class Array
   def flatten
-    ___
+    self.length.times {self.flatten!}
+    self
   end
 end
 

Arrays/Exercise_Version_Sort.rb

@@ -1,8 +1,20 @@
 class Array
   def version_sort
-    ___
+    def to_array(s)
+      a = s.scan(/(\d+)([a-z]*)/).flatten 
+      a.each_with_index.map {|e,i| i.even? ? e.to_i : e!="" ? e : i==a.length-1 ? (?a.ord-1).chr : (?z.ord+1).chr}
+    end
+
+    return self.sort do |a,b|
+      am, bm = to_array(a), to_array(b)
+      len = [am.length, bm.length].min
+      cmp = 0
+      am[0,len].zip(bm[0,len]).each {|pair| break if (cmp = (pair.first<=>pair.last)) != 0}
+      cmp
+    end
   end
 end
+
 filenames = [
   "foo-1.10.2.ext",
   "foo-1.11.ext",

Classes/Exercise_Baby_Got_Stacks.rb

@@ -1,5 +1,20 @@
 class Stack
-  ___
+  def initialize(stack)
+      	@stack = stack
+  	end
+
+  	def pop(*n)
+      	@stack.pop(*n)
+  	end
+
+  	def push(items)
+      	@stack.push(*items.reverse)
+      	true
+  	end
+
+  	def to_a
+      	@stack
+  	end
 end
 
 stack = Stack.new([5, 6, 7, 8])

Classes/Exercise_Getters_Setters.rb

@@ -1,5 +1,5 @@
 class Character
-  ___ :name, :quote
+  attr_accessor :name, :quote
 end
 
 thorin = Character.new

Classes/Exercise_Queue_Continuum.rb

@@ -1,7 +1,20 @@
 class Queue
-  ___
+  def initialize(queue)
+      	@queue = queue
 end
+def pop(*n)
+    	@queue.shift(*n)
+	end
 
+	def push(items)
+    	@queue.push(*items)
+    	true
+	end
+
+	def to_a
+    	@queue
+	end
+end
 queue = Queue.new([5, 6, 7, 8])
 
 assert_equal queue.pop, 5

Hashes/Exercise_The_Little_Hash_Key_that_Could.rb

@@ -1,5 +1,5 @@
 def key_for_min_value(hash)
-  ___
+ hash.key(hash.values.min)
 end