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Cash Register Project

Activity Directions

GOAL: In index.js, there are a collection of functions which provide functionality for a cash register to be used by a point-of-sale system. Your task is to complete the functions by writing the logic to meet the specifications below:

  • Level 1:
    • removeItem(name, drawer): Removes a single item from the drawer
    • addItem(name, drawer): Adds a single item to the drawer
  • Level 2:
    • countCoins(drawer): Counts how many coins are in the drawer
    • countNotes(drawer): Counts how many notes/bills are in the drawer
  • Level 3:
    • sumDrawer(drawer): Calculates the total amount of money in the drawer as a string formatted in dollars (see example below)
  • Level 4:
    • canMakeAmount(target, drawer): Determines whether it is possible to create a specific cash amount from the items in the drawer.
  • Level 5:
    • transaction(cost, paid, drawer): Calculates the change required from a transaction and removes it from the drawer if possible.

Each function accepts a drawer array of objects. Currency types and amounts that may be in the drawer array are represented in integers rather than decimals.

Currency Unit Amount
Penny 1
Nickel 5
Dime 10
Quarter 25
Dollar 100
Five Dollars 500
Ten Dollars 1000
Twenty Dollars 2000
One-hundred Dollars 10000

An example drawer array of objects has been provided for you in the drawer.js file.

const drawer = [
  { name: "penny", value: 1, quantity: 72 },
  { name: "nickel", value: 5, quantity: 41 },
  { name: "dime", value: 10, quantity: 31 },
  { name: "quarter", value: 25, quantity: 17 },
  { name: "one", value: 100, quantity: 90 },
  { name: "five", value: 500, quantity: 11 },
  { name: "ten", value: 1_000, quantity: 2 },
  { name: "twenty", value: 2_000, quantity: 3 },
  { name: "hundred", value: 10_000, quantity: 1 },
];

Running and Testing Your Code

  1. Run your code (npm start).
  2. Test your code (npm test).