ruby under microscope

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A few Ruby tips and Ruby tips

A few Ruby tips and Ruby tips Sequential call of code blocksCopy codeThe Code is as follows:Def touch_downYield [3, 7]Puts "touchdown! "EndTouch_down do | (first_down, second_down) |Puts "# {first_down} yards on the run"Puts "# {second_down} yards passed"End=> "3 yards on the run"=> "7 yards passed"=> "Touchdown! " It mainly refers to the use of array in block Retrieve elements from arrayCopy codeThe Code i

Example of the use of hundreds of semicolons and literal values in Ruby: ruby percent

Example of the use of hundreds of semicolons and literal values in Ruby: ruby percent Use % () (abbreviated as % Q) for a single line string that requires interpolation and embedding double quotation marks ). Multi-line string, preferably heredocs. # bad (no interpolation needed) %( Do not use % q for strings without 'and. Unless many characters need to be escaped, the normal string is more readable.

Annotations, variable declarations, Array Operations, and Ruby variables in the ruby tutorial

Annotations, variable declarations, Array Operations, and Ruby variables in the ruby tutorial I read an article "PHP basic tutorial" on "blog Park" two days ago and introduced PHP. D guago also wrote a "Ruby getting started tutorial" when learning Ruby ". It should be noted that this article is suitable for beginners w

Ruby getting started-Ruby Installation

To install Ruby, go to the ruby official website to download the Windows Installation Package of ruby1.56. After installing Ruby, open the DOS window and enter ruby-V to display it. Ruby 1.8.6 (patchlevel 0) [i386-mswin32] indicates that

Tutorial on processing file input and output in Ruby, and tutorial on ruby processing output

Tutorial on processing file input and output in Ruby, and tutorial on ruby processing output Ruby provides a complete set of I/O-related methods, which are implemented in the Kernel module. All I/O methods are derived from IO classes. Class IO provides all basic methods, such as read, write, gets, puts, readline, getc, and printf. This section describes all the b

"Ruby" Ruby's model learning--active Record Associations

entities are destroyed Delete_all: All associated entities are deleted directly from the database, unrecoverable nullify: foreign keys are Set to NULL, unrecoverable restrict_with_exception: Throw exception hint Restrict_with_error: Throw error prompt 5, Foreign_key: Define column name for foreign Key 6, inverse_of : Indicates the inverse associated entity 7, Primary_key: Indicates the associated item ID 8, through: Indicates that a many-to-many relationship uses a third-party entity 9, validat

Concurrent concurrency and global lock details in ruby, and ruby parallel global explanation

Concurrent concurrency and global lock details in ruby, and ruby parallel global explanation Preface This article mainly introduces you to ruby concurrency and global locks. We will share the content for your reference and learning. I will not talk much about it below. Let's take a look at the details. Concurrency and Parallelism During development, we often come

Ruby Learning tips for building a ruby environment under Linux

Ruby Learning tips for building a ruby environment under Linux1. Preface2.Linux Installing the ruby EnvironmentFirst, prefaceThis blog post records the construction of the Ruby programming environment under Linux.This article is based on the following articles:Http://www.cnblogs.com/xfiver/archive/2012/03/08/2385833.ht

Ruby founder talks about Ruby's blocks and closure Structure

The founder of Ruby talked about the ruby blocks and closure structure at on. I want to repost on Qiu Haifeng's translation network (0) font size: T | T This conversation is translated from the third part of the interview with Matz on the artima.com website to help you understand the blocks and closure structures in ruby. AD: This interview is an interview with

Ruby Profiler detailed ruby-prof (I)

Project Address: Ruby-prof In the previous Profiling tool in Ruby, we listed several of the most commonly used profilers, but just a brief introduction, this time detailing how ruby-prof is used. Ruby-prof is a powerful, support CPU, memory use, object allocation and so on performance analysis, and provides a lot of fr

Introduction to file operations in Ruby and file operations in ruby

Introduction to file operations in Ruby and file operations in ruby Ruby provides a complete set of I/O-related kernel modules. All I/O methods come from IO classes. Class IO provides all the basic methods, such as read, write, gets, puts, readline, getc, and printf. This chapter covers all basic I/O functions available in Ru

Ruby image installation, ruby Image

Ruby image installation, ruby Image Because of the domestic network, the intermittent connection of resource files stored on Amazon S3 by rubygems.org fails. So you willgem install rackOrbundle installHalf a day without response.gem install rails -VTo view the execution process.This is a complete rubygems.org image. You can use this image to replace the official version. The synchronization frequency is cu

The example explains how Ruby uses the decorator mode in the design mode, and the ruby design mode.

The example explains how Ruby uses the decorator mode in the design mode, and the ruby design mode. OverviewIf you are engaged in object-oriented development, adding behavior to a class or object and using inheritance mechanisms, this is a basic feature of all object-oriented languages. If an existing class lacks some methods, or you need to add more functions (CHARM) to the method ), you may just inherit t

Solve ruby Installation Problems: redis requires Ruby version & amp; amp, rubyredis

Solve ruby Installation Problems: redis requires Ruby version amp, rubyredis I. Problem Description Today, we set up a redis cluster and encountered a problem when installing ruby and redis interface programs: redis requires Ruby version> = 2.2.2., as shown below: [root@localhost ~]# gem install redis-4.0.0.gem ERROR

Ruby uses the simple factory mode and factory method mode in the design mode, and the ruby Design Mode

Ruby uses the simple factory mode and factory method mode in the design mode, and the ruby Design Mode I have read the ruby design pattern before, But I gradually forget it. Now I bought a big talk design pattern, which doesn't look so boring. By the way, I implemented the code in ruby. Simple factory mode: #-*-Encodin

Ruby best practices: the best Ruby blog this year

It's pretty rare I recommend new blogs to follow on Ruby inside. Not because I don't like them-I link to their posts all the time!-But because it's hard to tell if a new blog is going to keep going and be worth your while. Well, the Ruby community has a new blog in its midst that's proving to be a must-read-Ruby Best Practices.It's a must-subscribe (RSS feed) fo

Ruby FPDF is a Ruby port of PHP version FPDF

What is Ruby FPDF? Ruby FPDF is a Ruby portOlivier Plathey's excellent PDF generator,FPDF.FPDF is written in PHP, and as such can only be used from PHP scripts.Ruby FPDF, as the name suggests, is written in Ruby and can be usedFrom Ruby scripts.

Application instance analysis of appearance mode in Ruby Design Mode Programming, and ruby Design Mode

Application instance analysis of appearance mode in Ruby Design Mode Programming, and ruby Design Mode What is the appearance mode? The appearance mode provides unified interfaces for a group of different interfaces in the subsystem. The upper-layer interfaces are defined. by reducing complexity and hiding the communication and dependency between subsystems, the subsystems are easier to use. For example, su

Tutorial on the basic usage of Regular Expressions in Ruby programs, ruby Regular Expressions

Tutorial on the basic usage of Regular Expressions in Ruby programs, ruby Regular Expressions Most of Ruby's built-in types are similar to other programming languages. Mainly include strings, integers, floats, and arrays. However, only script languages such as Ruby, Perl, and awk provide support for built-in expression types. Although the regular expression is re

Explain in detail the condition judgment statements in Ruby and explain the ruby judgment statements

Explain in detail the condition judgment statements in Ruby and explain the ruby judgment statements Ruby provides conditional structures, which are common in modern programming languages. Here, we will explain all the Ruby conditional statements and modifiers.Ruby if... else statement:Syntax: if conditional [then] co

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