Introduction to Functional programming

Here's an introduction to functional programming called Why Functional Programming Matters (pdf).

Apparently, it can give you more concise code and you get as much done in half as much code. The basic idea is that there's no state so you don't have to worry about issues that come out of that.

Here's a thread on Stack Overflow that answers the question about why would you would care about stateless programming.

Here's another introduction to functional programming.

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