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KayleeRea / tip-calculator

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Tip Calculator

You run a restaurant. Each night, the waitstaff get tips. You record each tip in your POS (point-of-sale) system, and at the end of the night you need to tally everything up.

Your POS system generates two files for you, both in JSON format:

  • the list of servers - each server has
    • a unique server id
    • a first name
    • a last name
  • the list of sales - each sale has
    • the total amount in pennies
    • the tip amount in pennies
    • the server's id
    • the date

Unfortunately, the sales report always includes 8 days of sales, and it only shows things in pennies.

Your mission, should you choose to accept it, is write a class that can return the tips for each server for a given date. Your class should have a method that returns a hash where:

  • the key is the server's full name
  • the value is the total amount that the server earned formatted like "$xx.xx"

Setup

Put your class in the lib directory.

Put your spec in the spec directory. Treat the JSON files like production data - that is, don't use them in your tests.

To check your work, create a bin directory and drop a script in there that runs your class against the JSON files.

Example

For example, imagine you have the following json:

# staff.json
[
  {
    "id": 3135,
    "first_name": "Ila",
    "last_name": "Nikolaus",
    "job_title": "server"
  },
  {
    "id": 4029,
    "first_name": "Cierra",
    "last_name": "Johnson",
    "job_title": "server"
  }
]

# sales.json
[
  {
    "server_id": 3135,
    "date": "2014-05-06",
    "total": 2404,
    "tip": 385
  },
  {
    "server_id": 3135,
    "date": "2014-05-06",
    "total": 2212,
    "tip": 398
  },
  {
    "server_id": 4029,
    "date": "2014-05-06",
    "total": 3005,
    "tip": 451
  }
]

Your class should be able to produce something like this for any given date:

{
  "Ila Nikolaus" => "$7.83",
  "Cierra Johnson" => "$4.51"
}

Checking your work

If you run your code for 5/11/2014 you should get a hash that looks like this:

{
  "Evans Kub"=>"$12.89",
  "Lawrence Stamm"=>"$17.94",
  "Abby Bauch"=>"$32.85",
  "Eula Abbott"=>"$35.52",
  "Warren Haley"=>"$33.31",
  "Benedict Bruen"=>"$21.23"
}

Hints

Formatting Ruby numbers can be tricky. Here's an example of converting pennies to a dollar string:

"$%.2f" % (780/100.0)

Setup

  • Fork
  • Clone
  • Turn on TravisCI for the fork by visiting https://travis-ci.org/profile/, clicking the "Sync now" button and scrolling down to find the repository to build.
  • Create a new branch for your work using git checkout -b v1
  • Implement specs and code
  • Push using git push -u origin v1

Further Practice

This warmup can be completed multiple times to increase your comfort level with the material. To work on this from scratch, you can:

  1. Add an upstream remote that points to the original repo git remote add upstream git@github.com:gSchool/tip-calculator.git
  2. Fetch the latest from the upstream remote using git fetch upstream
  3. Create a new branch from the master branch of the upstream remote git checkout -b v2 upstream/master
  4. Implement specs and code
  5. Push using git push -u origin v2

Each time you do the exercise, create a new branch. For example the 3rd time you do the exercise the branch name will be v3 instead of v2.

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