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:

• Number
• String
• Booleans
• Nil
• List
• Map

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

Getting Started

Fetch dependencies and run the tests.

$ mix deps.get
$ mix test

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