# Day 19 Warm-up

## Conceptual

In our ToDo App, where do the following run? (These might be trick questions)

1. `/public/todo.js`
2. `/routes/todo.mjs`
3. `/package.json`

## Programming

Add an additional `/random` router to our ToDo App.  There should be two 
endpoints:

1. `/randrange`: return a JSON object containing a random integer or some sort
   of error message. There are two possible query parameters:
  
    * `start`: the starting value of the range (default: 0)
    * `end`: the ending value (exclusive) of the range (required)

2. `/random`: return a JSON object containing a random float in the range 0-1.0
   (excluding 1.0).

Modify our existing code so that you can reuse the `randrange` function. Think
carefully about where this code should be moved. Any changes you make should
maintain exisiting functionality.

Time permitting, also add a `/math` router that supports:

  * `add`
  * `subtract`
  * `multiply`
  * `divide`

Each should support two arguments. Return the answer as part of a JSON object or
provide an error condition if there is a problem.