Having troubles working with filter etc on arrays?
You’ve probably heard of Javascript30 by Wes Bos (30 exercises/min projects in Javascript, free!!).
I’m not that far into it (err…number 4) but you should really check Array Cardio Day (n 4), where Wes Bos works through arrays with various methods (functions?) like reduce(), filter(), etc.
Plus nice tips - such as console.table() 
and intro to ES6 stuff. Like the fat arrow.
[EDIT] If you can’t be bothered or would like to check out the code directly, visit Wes Bos’ repo.
