Feature #5663
Updated by nobu (Nobuyoshi Nakada) about 4 years ago
It is pretty common to want to map over an `Enumerable`, Enumerable, but only include the elements that match a particular filter. A common idiom is: ```ruby enum.map { |i| i + 1 if i.even? }.compact ``` It is of course also possible to do this with two calls: ```ruby 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: ```ruby enum.map_select { |i| i + 1 if i.even? } ``` The only caveat is that it would be impossible to intentionally return nil here; suggestions welcome. The naming is also a strawman; feel free to propose something better.