stacks and queues done #18

dnsrocha · 2021-04-15T08:02:39Z

Stacks and Queues

Thanks for doing some brain yoga. You are now submitting this assignment!

Comprehension Questions

Question	Answer
What is an ADT?	Abstract Data Type - A type of object which is described by the methods it has and how they perform.
Describe a Stack	A Stack is a data structure which stores a list of data and only provides access in a Last-In-First-Out (LIFO) order.
What are the 5 methods in Stack and what does each do?	New (initializes the stack), push (adds an item to the stack), pop (removes item from stack), empty (checks if stack is empty), to_s (converts stack to string)
Describe a Queue	A Queue is a data structure which stores a list of data and only provides access in a First-In-First-Out (FIFO) order.
What are the 5 methods in Queue and what does each do?	New (initializes the queue), enqueue (adds an item to the queue), dequeue (removes an item from the queue and provides ice cream), empty (checks if a queue is empty), to_s (converts a queue to string)
What is the difference between implementing something and using something?	Implementing is writing the code behind a problem statement or objective, while using is just running it.

OPTIONAL JobSimulation

Question	Answer
Did you include a sample run of your code as a comment?

CheezItMan

Well done Denise, you hit the learning goals here. Nice work!

CheezItMan · 2021-04-15T17:37:57Z

lib/queue.rb

+    @store = Array.new(20)
+    @start = 0
+    # @end = 0
+    @size = 0
  end

  def enqueue(element)


CheezItMan · 2021-04-15T17:38:10Z

lib/queue.rb

+    if size < 20
+      @store[(@start + @size) % 20] = element
+      @size += 1
+    end
  end

  def dequeue


CheezItMan · 2021-04-15T17:38:29Z

lib/queue.rb

-    raise NotImplementedError, "Not yet implemented"
+    if @size != 0
+      element = @store[@start] 
+      @start = (@start + 1 ) % 20


Avoid hardcoding the 20

Suggested change

@start = (@start + 1 ) % 20

@start = (@start + 1 ) % @store.length

CheezItMan · 2021-04-15T17:38:38Z

lib/queue.rb

+      @start = (@start + 1 ) % 20
+      @size -= 1
+      return element
+    end
  end

  def front


CheezItMan · 2021-04-15T17:38:42Z

lib/queue.rb

  end

  def front
-    raise NotImplementedError, "Not yet implemented"
+    return @store[@start]
  end

  def size


CheezItMan · 2021-04-15T17:38:46Z

lib/queue.rb

  end

  def size
-    raise NotImplementedError, "Not yet implemented"
+    return @size
  end

  def empty?


CheezItMan · 2021-04-15T17:39:08Z

lib/queue.rb

  end

  def empty?
-    raise NotImplementedError, "Not yet implemented"
+    return @size == 0
  end

  def to_s


CheezItMan · 2021-04-15T17:39:15Z

lib/stack.rb

@@ -1,19 +1,26 @@
 class Stack


stacks and queues done

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CheezItMan reviewed Apr 15, 2021

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stacks and queues done #18

stacks and queues done #18

dnsrocha commented Apr 15, 2021

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	@start = (@start + 1 ) % 20
	@start = (@start + 1 ) % @store.length

stacks and queues done #18

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stacks and queues done #18

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dnsrocha commented Apr 15, 2021

Stacks and Queues

Comprehension Questions

OPTIONAL JobSimulation

CheezItMan left a comment

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