Coding · ·

Shopping

You've decided you want to count some things, by keeping a tally. But you're not sure yet what you want to count. So you'd like a simple script that takes the name of something, plus an optional count, and adds that count to the tally for that kind of something. Note that your program needs to have persistence, by storing to a simple database on disk.

Here's an example interactive session with a working program:

❯ bun shopping.js
Nothing to shop for yet!

❯ bun shopping.js badger
Adding 1 x "badger"
Here's your current shopping list:
---
1 badger

❯ bun shopping.js badger 4
Adding 4 x "badger"
Here's your current shopping list:
---
5 badger

❯ bun shopping.js "any kind of fruit" 4
Adding 4 x "any kind of fruit"
Here's your current shopping list:
---
5 badger
4 any kind of fruit

❯ bun shopping.js socks
Adding 1 x "socks"
Here's your current shopping list:
---
5 badger
4 any kind of fruit
1 socks

❯ bun shopping.js
Here's your current shopping list:
---
5 badger
4 any kind of fruit
1 socks

❯ bun shopping.js CLEAR
Shopping list cleared!

Requirements

show the message Nothing to shop for yet! if there are no items currently on the shopping list
if 1 argument is provided, treat that as the name of an item to add to the shopping list
if 2 arguments are provided, treat the 2nd as the number of that item to add to the shpping list
if the 1st argument is CLEAR then delete all items from the shpping list and show the message Shopping list cleared!
unless clearing, show the message Here's your current shopping list: with a list of all items and their count shown below, as per the interactive session example above

Tips

you'll probably want a simple JSON database for this - see this lesson's guide and the sample code in it
you're taking command line arguments, so see the relevant guide for that
if storing a JSON database to disk, you can quickly see its contents on the CLI with cat [filename]