Functional Programming Explained to my grandma

Functional programming reminds you of some old school memories... Monad scares you and you think High Order Function are rude words. However you love lambdas and you feel immutability is a great thing. I will introduce you to core principles of functionnal programming without complexity and you will be able to apply them straight away. No installation required: just internet, a basic knowledge of your favourite language and a web browser.