Jsonex

Coding challenge for 2019.02.19 DFW Elixir Hack Night

The Challenege

Write a JSON serializer in Elixir. To make unit tests pass, you will need to implement the Jsonex.encode/1 function defined in lib/jsonex.ex.

Example:

iex> Jsonex.encode(%{success: true, foo: [1, 2, 3, 4]})
"{\"foo\":[1,2,3,4],\"success\":true}"

Not all data types can be converted to JSON. You must implement valid conversions for the following types:

Do not convert invalid types (pids, tuples, etc). Instead, you should raise a Jsonex.BadInputError:

iex> raise Jsonex.BadInputError, {:ok, 1234}
** (Jsonex.BadInputError) did not get what was expected, got: {:ok, 1234}

Other things to note:

Strip all whitespace from your outputted JSON string
Atoms should be converted to JSON strings
Properly escape string quotes in the output
Floats are not supported in the official JSON specification, raise a BadInputError instead
Ignore implementing support for keyword lists

Fetch dependencies and run the tests.

$ mix deps.get
$ mix test

All tests should be failing. Make them pass to complete the challenge!