exercism 87,88 bank-acc and Gilded-Rose

Author: kumar91gopi

README.md

@@ -312,6 +312,8 @@ solution of many challenges of [Leetcode](https://leetcode.com/), [Exercism](htt
 84. [Complex Number](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/complex_number.rb)
 85. [Microwave](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/microwave.rb)
 86. [Darts](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/darts.rb)
+87. [Bank Account](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/bank_account.rb)
+88. [Gilded Rose](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/gilded_rose.rb)
 
 <a name="leetcode"/>
 

exercism/bank_account.rb

@@ -0,0 +1,38 @@
+# Problem: https://exercism.org/tracks/ruby/exercises/bank-account
+
+# Solution
+class BankAccount
+    def initialize
+      @opened = false
+      @balance = 0
+    end
+
+    def open
+      raise ArgumentError.new("You can't open an already open account") if @opened
+      @opened = true
+    end
+
+    def balance
+      raise ArgumentError.new("You can't check the balance of a closed account") unless @opened
+      @balance
+    end
+
+    def deposit(amount)
+      raise ArgumentError.new("You can't deposit a negative amount") if amount<0
+      raise ArgumentError.new("You can't deposit money into a closed account") unless @opened
+      @balance+= amount
+    end
+
+    def withdraw(amount)
+      raise ArgumentError.new("You can't withdraw money into a closed account") unless @opened
+      raise ArgumentError.new("You can't withdraw a negative amount") if amount<=0
+      raise ArgumentError.new("You can't withdraw more than you have") if amount>@balance
+      @balance-=amount
+    end
+
+    def close
+      raise ArgumentError.new("You can't close an already closed account") unless @opened
+      @opened = false
+      @balance = 0
+    end
+end

exercism/gilded_rose.rb

@@ -0,0 +1,75 @@
+# Problem: https://exercism.org/tracks/ruby/exercises/gilded-rose
+
+# Solution
+Item = Struct.new(:name, :sell_in, :quality) #instead of struct a class Item can be created
+
+class GildedRose
+  REVERSE_AGING_ITEMS = ["Aged Brie", "Sulfuras, Hand of Ragnaros", "Backstage passes to a TAFKAL80ETC concert"]
+
+  def initialize(items)
+    @items = items
+  end
+
+  def update!
+    @items.each do |item|
+      update_quality(item)
+      update_sell_in(item)
+    end
+  end
+
+  def update_quality(item)
+    is_conjured = item.name.downcase.start_with?("conjured")
+    if is_conjured
+      return update_conjured_item_quality(item)
+    end
+    
+    if REVERSE_AGING_ITEMS.include?(item.name)
+      return update_reverse_aging(item)
+    end
+    
+    update_normal_item(item,false)
+  end
+
+  def update_sell_in(item)
+    item.sell_in-=1 unless item.name == "Sulfuras, Hand of Ragnaros"
+  end
+
+  def update_normal_item(item,is_conjured=false)
+    sell_in_not_arrived = (item.sell_in>0)
+    if sell_in_not_arrived
+      item.quality-=1 if is_conjured
+      item.quality = item.quality>=1 ? item.quality-1 : 0
+      return item.quality
+    end
+    item.quality = item.quality>=2 ? item.quality-2 : 0
+  end
+
+  def update_reverse_aging(item)
+    return if item.quality==50 or item.name.include?("Sulfuras, Hand of Ragnaros")
+    return update_backstage_passes(item) if item.name.include?("Backstage passes to a TAFKAL80ETC concert")
+    item.quality = item.sell_in>0 ? item.quality+1 : item.quality+2
+    item.quality = item.quality > 50 ? 50 : item.quality
+  end
+
+  def update_backstage_passes(item,is_conjured=false)
+    return item.quality=0 if item.sell_in <=0
+    if item.sell_in<=5
+      item.quality+=3
+    elsif item.sell_in<=10
+      item.quality+=2
+    else
+      item.quality+=1
+    end
+    item.quality-=1 if is_conjured
+    item.quality = item.quality > 50 ? 50 : item.quality
+  end
+  
+  def update_conjured_item_quality(item)
+    return item.quality=0 if item.sell_in <=0
+    if item.name.include?("backstage passes to a TAFKAL80ETC concert")
+      return update_backstage_passes(item,true)
+    end
+    return update_reverse_aging(item) if item.name.include?("Sulfuras") or item.name.include?("Aged Brie")
+    return update_normal_item(item,true)
+  end
+end