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Ruby Ruby Collections Build a Grocery List Program Build a Grocery List Program: Part 4

Erik Nuber
Erik Nuber
20,629 Points
Posted by Erik Nuber
Erik Nuber
20,629 Points

Ruby - Grocery List adding in lots more code (just sharing)

Trying to use as much as has been learned up until this point. Just sharing at how I elaborated on the lesson with more interactivity

Here we have code that was created during the lesson, I commented anyway

def create_list  #create a new list giving it both a name and making empty array for items
  print "What is the list name?"
  name = gets.chomp
    hash = {"name" => name, "items" => Array.new}
  return hash
end

def add_list_item # add both item and quantity of that item to the list
  print "What is the item called? "
  item_name = gets.chomp
    print "How many do you want? "
  quantity = gets.chomp.to_i
    hash = {"name" => item_name, "quantity" => quantity}
  return hash
end

def lineSeperator(character="-") # create seperation on the list to make it easier to read
  puts character * 80
end

def print_list(list) # print out the final list of items
  puts "List: #{list['name']}"
  lineSeperator()
  list["items"].each do |item|
    puts "\tItem: " + item['name'] + "\t\t\t" +
      "Quantity: " + item['quantity'].to_s
      lineSeperator()
    end   
end

This is where I deviated from the lesson. Rather than just add a couple items to the list, I figured this gives an option to have as many items added to the list as the user would like. I created the variable moreItems as an empty string and use it to store a Yes or No value there after. The Until/Do forces a user to either answer yes or no as it is tested for.

def addItemsToList # find out if more items should be added to the list
  moreItems = "" #create an empty variable
  #create a loop to verify a Yes or NO answer has been made
  until (moreItems == "Y" || moreItems == "YES" || moreItems == "N" || moreItems == "NO") do
    puts "Do you want to add an item to your list? (Y/N)"
    moreItems = gets.upcase.chomp
  end  
  return moreItems  #returns a Yes or No
end

Here I created a couple methods to respond to whether the user wants to see the list they created or not. For outputList, you have to pass in the list that was created so that the print_list function can then use it. The noOutputList just gives a formal response if the user doesn't want to see the list.

def outputList(list) 
  puts "Here is your list: \n"
  print_list(list)
end  

def noOutputList
  puts "Okay well maybe later. Have a beautiful time."
end

I created the variable here for moreItems that finds out if items should be added to the list as a while/do loop has a condition that must be met; you have to set up that condition outside of the loop. This way, the user could choose not to add an item to the list at all. The While/Do loop repeats the same code over and over while the user wants to add an item to the list responding "yes" to that choice, a "no" will exit the loop.

list = create_list #call to create the list

moreItems = addItemsToList #call for first time to see if items should be added in

while (moreItems == "Y" || moreItems == "YES") do #create a loop to add items onto list
  list["items"].push(add_list_item())
  moreItems = addItemsToList
end

Here I find out if the user wants to see the list or not. I could have once again added in a check for a yes or no response but, used a case statement instead which has a response for that as well. 

puts "Do you want to see your shopping list? (Y/N)"  
answer = gets.upcase.chomp  

case answer
  when "Y"
    outputList(list)
  when "YES" 
    outputList(list)
  when "N" 
    noOutputList
  when "NO" 
    noOutputList
  else 
  puts "Uh OH, you didn't say yes or no."
end
zanslitinskis
zanslitinskis
2,049 Points

Done something same, but add without creating def.Also added calculation of items in cart

def create_list
  print"What is the list name?"
  name=gets.chomp
  hash={"name"=>name,"items"=>Array.new}
  return hash
end
def add_item
print "What is the item called?"
  item_name=gets.chomp
print "How much?"
  quantity=gets.chomp.to_i
  hash={"name"=>item_name,"quantity"=>quantity}
  return hash
end
def print_separator(character="-")
 puts character*80
end
def print_list(list)
puts "List:#{list['name']}"
print_separator()
list["items"].each do |item|
  puts "\tItem: " +item['name'] +"\t\t" +
   "Quantity: "+ item['quantity'].to_s

  end
print_separator()
puts "Total items in cart: "+list["items"].count.to_s #adding item total in cart
print_separator()
end

list=create_list()
puts"Great!Now add some items to your cart."
list['items'].push(add_item())
puts "Do you want to add more item?(Yes/No)"
more_item=gets.chomp
while more_item=="Yes" ||more_item=="yes" do
 list['items'].push(add_item())
  puts "Do you want to add more item?(Yes/No)"
  more_item=gets.chomp
  break if more_item=="No"|| more_item=="no"
  end
puts "Here is you shopping list"

print_list(list)