Restock Inventory - codepath/compsci_guides GitHub Wiki

Unit 2 Session 1 (Click for link to problem statements)

U-nderstand

Understand what the interviewer is asking for by using test cases and questions about the problem.

• If the restock list is empty, should I return the unchanged inventory?
  • Yes.
• If the inventory is empty, what should happen?
  • All restock items would be added to the inventory.

P-lan

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Go through each item in the restock dictionary, and add/update it's quantity in the current inventory.

1) Loop through each entry in the restock dictionary
  a) If the item (key) is already in the inventory, add the new quantity
  b) If this is a new item, add it to the inventory and set the new quantity
2) Return the inventory once all changes have been made 

⚠️ Common Mistakes

• Make sure you are adding the restock amounts to the current inventory, not replacing the previous amounts!

I-mplement

def restock_inventory(current_inventory, restock_list):

    # Loop over restock_list items to update current_inventory
    for item, quantity in restock_list.items():
        if item in current_inventory:
            current_inventory[item] += quantity
        else:
            current_inventory[item] = quantity
    
    return current_inventory