Ruby

About hashingLet's take a look at the basic idea of hashing:To set the number of objects to be stored in NUM, then we use Len Memory units to store them (len>=num); With the keyword of each object ki as the independent variable, a function h (KI) is

Just learn ruby, it happens algorithm teacher encourage in unfamiliar language to write algorithm, I use Ruby Bar ~ ~In other words, Ruby is really awesome, and it's a lot of intuitive way to use ... In the infinite worship .... During the period I

1, Aliyun a key to install the Web-wide environment Download one-click to install Web full-environment Sh.zip compression packUpload to the server, decompression, execute the script, detailed steps described here $ mv sh.zip/home/tmp/&

1. Foreword Whether you use Ruby for System management or web development with rails, you may experience recurring tasks that follow a certain period of time (1 hours, 2 days ...). ) to be triggered continuously. In Ruby, I think it's convenient to

ObjectiveSee a lot of articles say Ruby environment is very difficult to build on windows, there will be a variety of strange problems, so it is recommended to Linux and Mac installation development. But I followed the tutorials and the questions

This article mainly describes how I have raised Ruby gem Contracts.ruby speed by 10 times times. Contracts.ruby is used in my project to add code contracts (contracts) to Ruby. It seems to be the same: Contract num, num => num def add (A, b)

Web applications are mostly IO-intensive, and using Ruby's multi-process + multithreaded model will greatly increase system throughput. The reason for this is that when a ruby thread is in the IO block state, other threads can continue to execute.

In the Users/index view, you can automatically make a link to a page by using just one line of code: I did not tell it to change which target array to page, but it can be intelligently positioned to@usersVariable. It's amazing, can't help

There are three ways the shell command obtains the process ID:1.Ps-a |grep cmdname| awk ' {print '} '2.Pidof cmdname3.Pgrep cmdnameHow do you do it in Ruby?There are three ways to execute shell commands in Ruby:%x: Executes the command and returns

Converting an array to activerecord::relation is a common requirement. For example, in my project, the backup_projects return value of the array form is obtained from the method. In order to sort and page out this collection, I need to convert it to

Every programmer should learn to use Python or rubyIf you are a student, you should be c,c++ and Java. There will be some VB, or c#/.net. How much you may have developed some Web pages, you know some html,css and JavaScript knowledge. On the whole,

How to learn Ruby? What do you need to know before you learn Ruby? This is a lot of people want to learn the voice of Ruby friends, I do not give a specific answer, the following to tell you about a predecessor learning Ruby (http://www.maiziedu.com/

Ruby block, in my opinion, is inserting a variable function.block_name{ statement1 statement2 ..... }It doesn't seem to know what it is, but don't worry, keep looking down. Block function calls yield statement by yield the English is yielding,

Ubuntu installation and Development Kit $Sudo apt-Get install wget Vim build-essential OpenSSL libreadline6 libreadline6-dev curl Git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libxml2-dev libxslt-dev Autoconf automake libtool ImageMagick

Reference data:ForRuby on RailsIf you are not clear about it, you can refer to the following link information.Ruby on RailsInformation. Ruby: A pure Oo Script Language ..Ruby on Rails: Quick Building Web Of MVC Architecture Framework

Original DBI module installation Tutorial: 1.Install First, I use mysql for testing. You need to install the mysql database on your machine.Then execute:Gem install mysql Download ruby-DBI from rubyforge, decompress it, and run the following command

Test the Cluster of Redis Cluster on Windows to fill in the note, redisclusterFor the principle of redis cluster implementation, see the http://www.tuicool.com/articles/VvIZje cluster environment requires at least three nodes. We recommend that you

Instructions on how to use the XML data processing database REXML in Ruby, rubyrexml Use REXML as a treeThe purpose of REXML is to be enough. To the maximum extent, it can complete tasks well. In fact, REXML supports two different styles of XML

Detailed descriptions of hook methods in Ruby and Ruby hook Methods Ruby's philosophy is based on a basic element, that is, to make programmers happy. Ruby pays great attention to the joy of programmers and provides many different methods to

Programming Ruby Reading Notes, programmingruby In Ruby, you can call constructor to create an object. Song1 = Song. new ("Ruby ") Ruby rarely processes single quotes. Except for a few exceptions, the literal content entered into the string