> It is pretty common to want to map over an Enumerable, but only include the elements that match a particular filter. A common idiom is:
>
> enum.map { |i| i + 1 if i.even? }.compact
>
> It is of course also possible to do this with two calls:
>
> enum.select { |i| i.even? }.map { |i| i + 1 }
>
> Both cases are clumsy and require two iterations through the loop. I'd like to propose a combined method:


+1 for a combined map and select.  I find myself reaching for it every
so often and wishing it were there.