homework

array-list.rb

@@ -2,25 +2,52 @@
 
 class ArrayList
   def initialize
-    @storage = []
+    @storage = [nil,nil,nil,nil,nil]
+    @size = 0
   end
 
   def add(value)
+    @storage[@size] = value
+    @size += 1
   end
 
   def delete(value)
+    return nil if empty?
+    @size -= 1
   end
 
   def display
+    @size.times do |i|
+      puts @storage[i]
+    end
   end
 
   def include?(key)
+    @size.times do |i|
+      if @storage[i] == key
+        return true
+      end
+    end
+    return false
   end
 
   def size
+    return @size
   end
 
   def max
+    return nil if empty?
+    biggest = 0
+    @size.times do |i|
+      if @storage[i] > @storage[biggest]
+        biggest = i
+      end
+    end
+    return @storage[biggest]
+  end
+
+  def empty?
+    @size == 0
   end
 
 end

linked-list.rb

@@ -5,9 +5,9 @@
 class Node
    attr_accessor :value, :next_node
 
-   def initialize(val,next_in_line=null)
+   def initialize(val,next_in_line=nil)
        @value = val
-       @next_nodex = next_in_line
+       @next_node = next_in_line
        puts "Initialized a Node with value:  " + value.to_s
    end
 end
@@ -63,9 +63,26 @@ def display
    end
 
    def include?(key)
+      current = @head
+      full_list = []
+      return p "#{key} is included!" if current.value == key
+      while current.next_node != nil
+          current = current.next_node
+          return p "#{key} is included!" if current.value == key
+      end
+      return p "#{key} is not included."
+
    end
 
    def size
+      current = @head
+      full_list = []
+      while current.next_node != nil
+          full_list += [current.value.to_s]
+          current = current.next_node
+      end
+      full_list += [current.value.to_s]
+      return p "Size is #{full_list.length}."
    end
 
    def max
@@ -88,6 +105,17 @@ def max
 ll.delete(10)
 ll.display
 
+puts "Does Linked List include 20?"
+ll.include?(20)
+
+puts "Does Linked List include 5?"
+ll.include?(5)
+
+puts "Does Linked List include 10?"
+ll.include?(10)
+
+puts "What is the size of the Linked List?"
+ll.size
 =begin
 Output:
 Initialized a Node with value:  5