Suppose we have multiple threads all calling the same function: def foo # do stuff ... end 100.times do |i| Thread.new do foo end end If two or more threads are currently inside of foo , do they each share the same local variables within foo ? This relates to my second question. Do threads have individual stack frames, or do they share stack frames within a single process? Speci
假设我们有多个线程都调用相同的函数： def foo # do stuff ... end 100.times do |i| Thread.new do foo end end 如果两个或多个线程当前位于foo ，它们是否在foo内共享相同的局部变量？ 这与我的第二个问题有关。 线程是否有单独的堆栈帧，还是共享单个进程中的堆栈帧？ 特别是，当多个线程分别调用foo和foo返回之前，堆栈中是否有多个foo副本，每个都有自己的局部变量，或者在堆栈中只有一个foo副本？ 是
在Ruby中， ::MyClass/MyModule作用域操作符是做什么的，它的目的是什么？ This explicitly refers to the MyClass in the global scope. If there is a MyClass in the global scope, but also a MyClass inside of SomeModule, referring to MyClass from inside of SomeModule will refer to MyClass inside of the module, not the global MyClass. Saying ::MyClass explicitly refers to the MyClass in the global scope
在Ruby中， ::MyClass/MyModule作用域操作符是做什么的，它的目的是什么？ 这明确引用了全局范围中的MyClass。 如果全局范围内有MyClass，而且SomeModule内部还有MyClass，则引用SomeModule内部的MyClass将引用模块内部的MyClass，而不是全局MyClass。 Saying :: MyClass明确引用全局范围中的MyClass。 class MyClass def self.something puts "Global MyClass" end end module SomeModule class MyClass def s
This question already has an answer here: What is Ruby's double-colon `::`? 9 answers From the Pickaxe: When a receiver is explicitly specified in a method invocation, it may be separated from the method name using either a period ( . ) or two colons ( :: ). The only difference between these two forms occurs if the method name starts with an uppercase letter. In this case, Ruby will
这个问题在这里已经有了答案： 什么是Ruby的双冒号`::`？ 9个答案 从镐： 当在方法调用中显式指定接收方时，可以使用句点（ . ）或两个冒号（ :: :）将其与方法名称分开。 如果方法名以大写字母开头，则会出现这两种形式之间的唯一区别。 在这种情况下，Ruby将假定receiver::Thing方法调用实际上是尝试访问接收器中的一个称为Thing的常量，除非方法调用在括号之间具有参数列表。 它被称为范围解析运算符。 基本上是
I would like to install a gem (JSON) on the client side, but only if hasn't been installed already (some 1.9 Ruby distros have JSON bundled). I couldn't find a clue on how to do that from gem help install . And running gem install json on a Windows system with Ruby 1.9 installed (with JSON bundled) results in ERROR: Error installing json: The 'json' native gem requires instal
我想在客户端安装gem（JSON），但只有在尚未安装（大约1.9个Ruby发行版捆绑JSON）的情况下。 我无法找到关于如何从gem help install完成的线索。 并且在gem install json了Ruby 1.9的Windows系统上运行gem install json （使用JSON捆绑）会导致结果 ERROR: Error installing json: The 'json' native gem requires installed build tools. - 它试图安装它，忽略了宝石已经存在的事实。 我不能做bash技巧，如gre
I am trying to understand the difference between these four methods. I know by default that == calls the method equal? which returns true when both operands refer to exactly the same object. === by default also calls == which calls equal? ... okay, so if all these three methods are not overridden, then I guess === , == and equal? do exactly the same thing? Now comes eql? . What does thi
我想了解这四种方法之间的区别。 我知道默认==调用方法equal? 当两个操作数引用完全相同的对象时，它将返回true。 ===默认情况下也调用equal?调用== equal? ...好吧，如果所有这三种方法都没有被覆盖，那么我猜=== ， ==和equal? 做同样的事情？ 现在来eql? 。 这是做什么的（默认情况下）？ 它是否调用操作数的哈希/ ID？ 为什么Ruby有这么多的平等标志？ 他们是否应该在语义上有所不同？ 我将在这里大量引用Ob
Ruby API says: The eql? method returns true if obj and other refer to the same hash key. I changed the hash method for Object : class Object def hash 1 end end Object.new.hash == Object.new.hash # => true Object.new.eql? Object.new # => false I don't understand why the second statement returns false ; according to Ruby Object API above, it should return true . This is a
Ruby API说： eql？ 方法返回true如果obj和其他引用相同的散列键。 我改变了Object的哈希方法： class Object def hash 1 end end Object.new.hash == Object.new.hash # => true Object.new.eql? Object.new # => false 我不明白为什么第二个陈述返回false ; 根据上面的Ruby Object API，它应该返回true 。 这是一个文档错误。 你读得对，但文件是矛盾的。 一方面，文件说： eql？ 方法返回true如
According to the Ruby Set class's documentation, "== Returns true if two sets are equal. The equality of each couple of elements is defined according to Object#eql?. The essence of this can be demonstrated using Date objects, where sets containing different Date objects but with the same date compare to equal: require 'set' d1 = Date.today # => Thu, 30 Sep 2010 puts d1
根据Ruby Set类的文档，“==如果两个集合相等，则返回true。每个元素的相等性根据Object＃eql？定义。 可以使用Date对象来演示其本质，其中包含不同Date对象但具有相同日期比较的集合： require 'set' d1 = Date.today # => Thu, 30 Sep 2010 puts d1.object_id # => 2211539680 d2 = Date.today + 1 # => Fri, 01 Oct 2010 puts d2.object_id # => 2211522320 set1 =
Are there any work arounds to getting HTML5 Drag and Drop working with Selenium Webdriver with Ruby? I am using Selenium-Webdriver 2.20.0 with Ruby 1.9.2 Here is a simple test to reproduce the issue: require "selenium-webdriver" require "test/unit" class Html5DragAndDropTest < Test::Unit::TestCase def setup @driver = Selenium::WebDriver.for :firefox @driver.manage.timeouts.impl
是否有任何解决方案可以使用Selenium Webdriver与Ruby一起使用HTML5 Drag and Drop？ 我使用Selenium-Webdriver 2.20.0和Ruby 1.9.2 这是一个简单的测试来重现问题： require "selenium-webdriver" require "test/unit" class Html5DragAndDropTest < Test::Unit::TestCase def setup @driver = Selenium::WebDriver.for :firefox @driver.manage.timeouts.implicit_wait = 30 end def teardown @dri
My question is similar to "What is the difference between include and extend in Ruby?". What's the difference between require and include in Ruby? If I just want to use the methods from a module in my class, should I require it or include it? What's the difference between "include" and "require" in Ruby? Answer: The include and require methods do ver
我的问题类似于“在Ruby中包含和扩展有什么区别？”。 Ruby中的require和include什么区别？ 如果我只是想在我的课程中使用模块中的方法，我是否require它或include它？ Ruby中的“include”和“require”有什么区别？ 回答： include和require方法做了非常不同的事情。 require方法在大多数其他编程语言中都包括：运行另一个文件。 它还会跟踪您过去需要的内容，而且不会要求相同的文件两次。 要运行另一个没有这个附加功
I began to learn about web crawlers recently and I built a sample crawler with Ruby, Anemone, and Mongodb for storage. I'm testing the crawler on a massive public website with possibly billions of links. The crawler.rb is indexing the correct information, although when I check the memory use in activity monitor it shows the memory constantly growing. I have only run the crawler for about
最近我开始学习网络爬虫，并且我构建了一个Ruby，Anemone和Mongodb存储示例爬虫。 我正在一个可能有数十亿个链接的大型公共网站上测试爬虫。 crawler.rb正在索引正确的信息，虽然当我检查活动监视器中的内存使用情况时，它显示内存在不断增长。 我只运行了大约6-7个小时的爬虫，内存显示为1.38GB的Mongo和1.37GB的Ruby进程。 这似乎每小时增长大约100MB左右。 看来我可能有内存泄漏？ 他们是一个更优化的方式，我可以实