cli-args-parser-kata

The goal of this program is to model a cli arguments parser. Given a series of input the program should produce a valid output according to the following specification.

Before you start

Try not to read ahead, do one task at a time (the trick is to learn to work incrementally)!
Make sure you only test for correct inputs;
You may use whatever programming language you prefer;
You should commit your code on GitHub or any other SCM repository you prefer;
You should release your work under an OSI-approved open-source license of your choice;
Remember to sent a PR once you're done with the kata 😉

Specification

Choose one of the following input formats:

string like arguments "--foo bar"
array like arguments ["--foo", "bar"]

1. parse a `simple` flags

given the following input:

--foo

the program should produce either a dictionary or a JSON object as follows:

{"foo": true}

2. parse a `composite` flags

given the following input:

--foo bar

the program should produce either a dictionary or a JSON object as follows:

{"foo": "bar"}

3. parse a `composite` flags with integer values

given the following input:

--number 1

the program should produce either a dictionary or a JSON object as follows:

{"number": 1}

4. parse multiple flags at once

given the following input:

--foo --bar baz --number 1

the program should produce either a dictionary or a JSON object as follows:

{"bar": "baz", "foo": true, "number": 1}

5. handle multiple values for the same flag

given the following input:

--foo --bar baz --bar zab --number 1

the program should produce either a dictionary or a JSON object as follows:

{"bar": ["baz", "zab"], "foo": true, "number": 1}

6. try to support both `string` and `array` input formats

within the same function or a new function one of your choice.

General requirements

We would love to see your submission written in JavaScript. Although, you can use whatever language and frameworks you want. Use something that you know well.
Provide a README with instructions on how to compile and run the application.

IMPORTANT: Implement the requirements focusing on writing the best code you can produce.

CODE SUBMISSION: Add the code to your own Github account and send us the link.

Credits to Ivo Putzer for the original idea.