Over 30 hands-on recipes that will get you up and running with Amazon Simple Storage Service (S3) efficiently About This Book Learn how to store, manage, and access your data with AWS SDKs Study the Amazon S3 pricing model and learn how to calculate
Amazon S3 is one of the most famous and trailblazing cloud object storage services, which is highly scalable, low-latency, and economical. Users only pay for what they use and can store and retrieve any amount of data at any time over the Internet,
AQuery AQuery is like JQuery but it for android. AQuery allows the developer to write less and do more for managing element of android like Activity, View, Network, Caching and many more. Getting Started To use this library Add in you top build.grad
闭包（Closure），是指未绑定到任何对象的自由代码，闭包中的代码与任何对象和全局变量无关，只与执行此段代码的上下文相关。
今天我们简要的看一下ruby中的闭包实现。
Ruby中的闭包实现有：Block，Proc，Lambada。
首先，我们来看Block。
代码如下:
ary = [1,2,3,4]
ary.collect! do |a|
a*a
end
ary.each do |a|
puts a
end
这段代码，我们使用了Array对象的block方法
