ruby

问题 I need to know the default values of variables in ruby. Global Variables: nil Instance Variables: ? Class Variables: ? Local Variables: ? I looked here, but all I could find is that global variables have a nil value. 回答1: You assign a local variable value at first assignment: local = 1 local1 + local # NameError: undefined local variable or method `local1' for main:Object Class variables are similar, if you use them without initialization, you get an error: class A @@a end # NameError:

问题 I'm using macOs Catalina. I'm trying to install older version of Ruby (1.9.3, 2.1.2) via rbenv. However, I keep getting the errors below, when trying installing older version. *It was fine when installing 2.4 or newer. I already try brew install openssl brew install readline brew install zlib as well as brew update. I have everything installed and up-to-dated but still the errors below keeps coming up. I also did tried to install with configure option RUBY_CONFIGURE_OPTS="--with-readline-dir=

问题 I'm using macOs Catalina. I'm trying to install older version of Ruby (1.9.3, 2.1.2) via rbenv. However, I keep getting the errors below, when trying installing older version. *It was fine when installing 2.4 or newer. I already try brew install openssl brew install readline brew install zlib as well as brew update. I have everything installed and up-to-dated but still the errors below keeps coming up. I also did tried to install with configure option RUBY_CONFIGURE_OPTS="--with-readline-dir=

问题 I want to run jQuery in a Ruby application and use it to manipulate an HTML string. (Yes, I know there are other Ruby libraries that can handle that task, but I have a good reason for using jQuery in this case.) Is this possible? I know that I can use ExecJS to execute simple JavaScript code in my Ruby application, but jQuery doesn't seem to be working: irb(main):001:0> require 'execjs' => true irb(main):002:0> require 'open-uri' => true irb(main):003:0> context = ExecJS.compile(open("http:/

问题 I want to run jQuery in a Ruby application and use it to manipulate an HTML string. (Yes, I know there are other Ruby libraries that can handle that task, but I have a good reason for using jQuery in this case.) Is this possible? I know that I can use ExecJS to execute simple JavaScript code in my Ruby application, but jQuery doesn't seem to be working: irb(main):001:0> require 'execjs' => true irb(main):002:0> require 'open-uri' => true irb(main):003:0> context = ExecJS.compile(open("http:/

问题 Using Sidekiq, what are the strategy to have it execute at a particular time in every time zone? For example, I need Sidekiq to perform a task every day at the following time and time zones across the world: ... 8:00 PM EST 8:00 PM CST 8:00 PM MST 8:00 PM PST ... 回答1: I would just run the same job at the start of each hour. You might want to use cron to run the job each hour or have a look at this list on how to create recurring jobs in Sidekiq. The first step within the job is to figure out

问题 My Jekyll installation used to work. Since an update, I face an issue with URL containing tag names which have some special characters. I now get an error message when trying to reach a URL with special characters in it like http://127.0.0.1:4000/tag/Actualit%C3%A9%20europ%C3%A9enne/ , where Actualité européenne is the name of a category. The error message is incompatible character encodings: UTF-8 and ASCII-8BIT . All the files in _posts directory are utf-8. Here is the stack trace : [2017

问题 My Jekyll installation used to work. Since an update, I face an issue with URL containing tag names which have some special characters. I now get an error message when trying to reach a URL with special characters in it like http://127.0.0.1:4000/tag/Actualit%C3%A9%20europ%C3%A9enne/ , where Actualité européenne is the name of a category. The error message is incompatible character encodings: UTF-8 and ASCII-8BIT . All the files in _posts directory are utf-8. Here is the stack trace : [2017

问题 My Jekyll installation used to work. Since an update, I face an issue with URL containing tag names which have some special characters. I now get an error message when trying to reach a URL with special characters in it like http://127.0.0.1:4000/tag/Actualit%C3%A9%20europ%C3%A9enne/ , where Actualité européenne is the name of a category. The error message is incompatible character encodings: UTF-8 and ASCII-8BIT . All the files in _posts directory are utf-8. Here is the stack trace : [2017

问题 I run Ubuntu 13.04 on my workstation with ruby 2.0.0, which was installed via RVM. $ aptitude show libxml2 Package: libxml2 State: installed Automatically instlled: no Multi-Arch: same Version: 2.9.0+dfsg1-4ubuntu4.1 $ aptitude show libxml2-dev Package: libxml2-dev State: installed Automatically installed: no Multi-Arch: same Version: 2.9.0+dfsg1-4ubuntu4.1 $ aptitude show libxslt-dev Package: libxslt1-dev State: installed Automatically installed: no Version: 1.1.27-1ubuntu2 Priority: