Ruby

It's really tedious to install/update the Ruby environment under your Mac.First, Mac OS X comes with a ruby environment, and we manage the Ruby version with RVM (Ruby version manager)Just execute the following 2 sentences:$ gpg2--keyserver

The Observer pattern (sometimes called the Publish/Subscribe mode) is one of the software design patterns.In this mode, a target object manages all the observer objects that are dependent on it and proactively notifies when its own state

Just see the Ruby language developer as (Matz, full name is Yukihiro Matsumoto) and launched a new language development, called Streem, still in a very primitive phase, only three files, code on GitHub. Look at Matz's own description, Streem is a

When values are all shaped, sort by the values of the hash:h = {'a' = =1,'b ' ==2,'C ' +5,'d' = 4} H.sort {|a,b| a[1]b[1]} Output: [["a", 1], ["b", 2], ["D", 4], ["C", 5]] When we need to sort the hash, we cannot use the Sort method as

Template mode is good, but it still has some flaws. For example, its implementation relies on inheritance and lacks sufficient flexibility. At this point we need to find a more optimal solution-the strategy model.The following is the report template

First, you need to add a delete link on the index page and provide a delete confirmation that the user confirms the deletion and deletes the data directly.Modify viewsModify the App/views/posts/index.html.erb as follows:our blogs

When I started to learn Ruby, I couldn't figure out the difference between the symbol (the variable needs to add:) and the string, in order to design such a thing for the language. It makes me confused.First, the string object is different. For

The main purpose of module is to put different methods and constants into different namespaces. The module is named in the same initial capitalization as the class, with multiple words without underlining. such as: Circlearea Module syntaxModule

Demand:Investors buy and sell stocksPreliminary code:#-*-encoding:utf-8-*-#stock 1classStock1defbuy puts'stock 1 Buy'EnddefSell puts'stock 1 Sell'EndEnd#Stock 2classStock2defbuy puts'stock 2 Buy'EnddefSell puts'Stock 2 Sell'EndEnd#Stock

Demand:Xiao Ming let Xiao Li Chase for him (send doll, send flowers, send chocolate)Code with no proxy:#-*-encoding:utf-8-*-#Suitor ClassclassPursuit attr_accessor:mmdefInitialize (mm) @mm=mm EnddefGive_dolls puts"#{mm.name} give you a

Chapter I.strings, numbers, classes, and objectsTo prove that Ruby is really good, Hello world can also be written in such a concise way:' Hello World '1. Input/outputPrint ('Enter your name') name=gets () puts ("Hello #{name} ")Note: Ruby is a big

In Ruby language, the Return Statement in the ruby functions are interesting, let's wait e them as below: Def concatenate (name_one = nil, name_two = "") return name_one + name_twoendname = concatenate "Wuhan", "Hubei" puts nameputs concatenate ("

The array size in Ruby can be changed at any time. The elements in the array only save references to objects.I. Definition A = array. New () A = array. New (5) Create an array of five nil Elements A = array. New () Create five arrays whose

Potential and Weakness Analysis of Ruby multithreading, and ruby Multithreading Most Web applications are IO-intensive. Using the Ruby multi-process + multi-thread model can greatly increase the system throughput. The reason is: when a Ruby thread

Grape entry, grapeseed 1. grape is a restful ruby microframework running in rack or used in combination with rails/sinatra. It simplifies APIs development by providing simple DSL (domain-specific language. it supports built-in general constraints

To understand the Strong Parameters mechanism in Rails 4, first take a look at Parameters in Rails3. When creating or updating an Active Record object in Rails3, there will be a Mass Assignment security issue. Therefore, a whitelist is required in

First, let's take a look at the NewRelic report. Average response time of the last 24 h Pages with high traffic) Several actions of traffic volume: TopicsController # show UsersController # show (miserable, mainly because GitHub API requests are

During the experiment, the folder name needs to be manually modified every time, which makes too much trouble for yourself. In order to get rid of the annoyance of manual modification, therefore, it is a good idea to use programs to modify folder

Ruby constant search path problem in-depth research, ruby constant The constant path search problem in Ruby has been a problem that has plagued me all the time. I have encountered several times in my work and have never thoroughly figured out why. I

GitHub address: https://github.com/adamsanderson/qwandry Qwandry can quickly locate the tools we need to find library files and projects. There are many methods for Fast Location in Ruby, And I know three of them: cd `bundle show active_record` Use