one line ruby array creation and population

Question

This is fairly trivial, but it bothers me to no end that I haven't yet found the answer using Google or this forum. But how can i turn this into one line? Without have to declare rooms an array above?

rooms = []
hwdata.availability.each {|room| rooms << room.name}

Answer 1

rooms = hwdata.availability.collect {|room| room.name}

或者在Ruby 1.9中更加简洁：

rooms = hwdata.availability.collect &:name

Answer 2

Or you can use #map also.

rooms = hwdata.availability.map {|room| room.name}