Read "Learn you a good haskell" - and practice the exercises in that book. It helped me a lot to understand the practical side of functional programming. For

Read "Learn you a good haskell" - and practice the exercises in that book. It helped me a lot to understand the practical side of functional programming. For a book that maximizes the utility of functional programming in your everyday life I would recommend "functional javascript" by the famous author of underscore.js