缩短枚举代码

Question

在Ruby中实现这一目标的简洁方法是什么？ 我只想等到所有对象都在运行。这似乎太罗嗦了。

# arr contains objects that respond to running?
all_running = false
until all_running
    sleep 0.5
    all_running = true
    arr.each{ |obj|
        all_running = all_running and obj.running?
    }

end

Answer 1

sleep 0.5 until arr.all? &:running?

Answer 2

怎么样

sleep(0.5) until arr.inject(true) { |all_running, obj| all_running and obj.running? }