Are side-effects possible in pure functional programming

Question

I have been trying to wrap my head around functional programming for a while now? I have looked up lambda calculus, LISP, OCML, F# and even combinatorial logic but the main

Answer 1

Even if you don't use it in your work, learning one or more functional programming languages is a great way to learn to think differently and gives you a toolkit of alternative approaches to problems (it can also frustrate you when you can't do something as neat and clean as a functional approach in other languages).

And it made me a better at writing XSL stylesheets.