Echo JS 0.11.0

Not sure I appreciate the title... I had a bit of a visceral reaction to the title because I had expected an advocation for a brute force method over the (Map|Object).groupBy static methods that are mentioned.

As opposed to something like: "For Array to Object Mapping, Use groupBy Not reduce"

Yeah, it's like an advice like "don't use x() to do the thing, now you can use doTheThing() that does the thing" XD