Seperation of concerns

[tacticiankerala]

I played around with the LISP interpreter and I quite liked it :). Awesome job!

When I went through the code, I felt rather than having all the code in one class seperating the concerns would drastically improve readability and maintainability. For example, we can seperate the following responsibilities,

1. Reading input from user
2. Parsing
3. Evaluating

And, if we keep the environment seperately then adding new functions need not have to touch any other part of the system.

[tacticiankerala]

I forgot to mention that seperation of concern helps in extensibility also. For example, you can add new functionality like reading from a file very easily.

[adarsh-why]

Thank you very much for spending your time to review the code.
I will separate the concerns and let you know.
Thanks again.