completed classroom exercise

lib/Queue.rb

@@ -1,22 +1,29 @@
 class Queue
   def initialize
+    @store_q = Array.new
   end
 
   def enqueue(element)
+    @store_q.push(element)
   end
 
   def dequeue
+    return @store_q.shift
   end
 
   def front
+    return @store_q.first
   end
 
   def size
+    return @store_q.length
   end
 
   def empty?
+    return size == 0
   end
 
   def to_s
+    return @store_q.to_s
   end
 end

lib/Stack.rb

@@ -4,18 +4,29 @@ def initialize
   end
 
   def push(element)
+    # @store << element
+    # @store.unshift(element)
+    @store.push(element)
+    #.unshift adds an element to the front of the array
+    #all three above do same thing
   end
 
   def pop
+    return @store.pop
   end
 
   def top
+    return @store.last
   end
 
   def size
+    return @store.length
   end
 
   def empty?
+    return size == 0
+    # return @store.length == 0
+    # basically both do the same thing
   end
 
   def to_s

specs/test-queue-implementation.rb

@@ -10,14 +10,14 @@
   end
 
   it "adds something to an empty Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(10)
     q.to_s.must_equal "[10]"
   end
 
   it "adds multiple somethings to a Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(10)
     q.enqueue(20)
@@ -26,14 +26,14 @@
   end
 
   it "starts the size of a Queue at 0" do
-    skip
+    # skip
     q = Queue.new
     q.size.must_equal 0
     q.empty?.must_equal true
   end
 
   it "removes something from the Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(5)
     removed = q.dequeue
@@ -43,7 +43,7 @@
   end
 
   it "removes the right something (LIFO)" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(5)
     q.enqueue(3)
@@ -55,7 +55,7 @@
   end
 
   it "properly adjusts the size with enqueueing and dequeueing" do
-    skip
+    # skip
     q = Queue.new
     q.empty?.must_equal true
     q.enqueue(-1)
@@ -70,7 +70,7 @@
   end
 
   it "returns the front element in the Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(40)
     q.enqueue(22)

specs/test-stack-implementation.rb

@@ -10,14 +10,14 @@
   end
 
   it "pushes something onto a empty Stack" do
-    skip
+    # skip
     s = Stack.new
     s.push(10)
     s.to_s.must_equal "[10]"
   end
 
   it "pushes multiple somethings onto a Stack" do
-    skip
+    # skip
     s = Stack.new
     s.push(10)
     s.push(20)
@@ -26,14 +26,14 @@
   end
 
   it "starts the size of a Stack at 0" do
-    skip
+    # skip
     s = Stack.new
     s.size.must_equal 0
     s.empty?.must_equal true
   end
 
   it "removes something from the stack" do
-    skip
+    # skip
     s = Stack.new
     s.push(5)
     removed = s.pop
@@ -43,7 +43,7 @@
   end
 
   it "removes the right something (LIFO)" do
-    skip
+    # skip
     s = Stack.new
     s.push(5)
     s.push(3)
@@ -55,7 +55,7 @@
   end
 
   it "properly adjusts the size with pushing and poping" do
-    skip
+    # skip
     s = Stack.new
     s.empty?.must_equal true
     s.push(-1)
@@ -70,7 +70,7 @@
   end
 
   it "returns the top element on the stack" do
-    skip
+    # skip
     s = Stack.new
     s.push(40)
     s.push(22)