Add size method

rearray.rb

@@ -1,25 +1,37 @@
 class Node
-  def initialize value
-    @value = value
-  end
+  attr_accessor :next, :value
 
-  def value
-    @value
+  def initialize value
+    self.value = value
   end
 end
 
 class Rearray
   def initialize
     @start = nil
+    @last  = nil
   end
 
   def push thing
     node = Node.new thing
     if @start
-      i_dont_know
+      @last.next = node
+      @last = node
     else
       @start = node
+      @last  = node
+    end
+  end
+
+  def size
+    return 0 unless @start
+    curr  = @start
+    count = 1
+    while curr != @last
+      curr = curr.next
+      count += 1
     end
+    count
   end
 
   def first

spec/rearray_spec.rb

@@ -1,4 +1,5 @@
 require "spec_helper"
+require "pry"
 require_relative "../rearray"
 
 describe Rearray do