Some basic knowledge about modules in Ruby and basic knowledge about Ruby modules
A module is similar to a class. It can also be called a class that cannot be instantiated ". Because the Class is a subclass of the Module Class, it may be better to say "Class = Module + instantiation Capability.
What is the so-called module used? There are two main types of functions: Mix-in and namespace.
Mix-in is actually
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
Explain the concept of range in Ruby and the concept of Ruby range.
The scope is everywhere: From January 1, January to January 1, December, from December 9 to December 9, 50 to 67 rows, and so on. Ruby supports a range and allows us to use multiple methods:
As sequence range
As condition range
Range
As sequence range:
First, it may be the most natural us
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
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
Four Methods for Equality judgment in Ruby and four methods for ruby equality judgment
It has long been known that ruby has four equality judgment methods: "=", "=", and "equal ?" And "eql ?", It is used in common programs, but I feel that I lack a deep understanding of it. When I read some of the rails source code today, I cannot determine the meaning of one of
We strongly recommend that you use the following Online Learning Websites: http://tryruby.org:
Ruby returns the last value in the method by default.
To return multiple values, you can use an array.
You can return a value by forcibly declaring return.
The basic output method is to use puts (output line) and print (print directly ).
The Basic Input Method is gets (read a row that contains '\ n' at the end of the row, which can be eliminated by cho
Basic Learning notes for Ruby metaprogramming and ruby learning notes
Note 1:The Code contains variables, classes, and methods, collectively referred to as language construct ).
# test.rbclass Greeting def initialize(text) @text = text end def welcome @text endendmy_obj = Greeting.new("hello")puts my_obj.classputs my_obj.class.instance_methods(false) #false means not inheritedputs my_obj.instance_variable
Assignment related operations in Ruby programming and ruby programming assignment
In earlier versions of Ruby, the return value of the value assignment statement is the return value of the method that sets this attribute. In Ruby1.8, the value of the value assignment statement is always the value of the parameter, and the return value of the method is lost.
class
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
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
Example of writing code for exception handling in Ruby, and ruby Exception Handling
A single exception uses the fail keyword only when an exception is caught and thrown repeatedly (because you do not fail here, but are accurate and intentionally throw an exception ).
begin fail 'Oops' rescue => error raise if error.message != 'Oops' end
Do not specify an accurate RuntimeError for fail/raise.
# bad
Tutorial on interrupt and return in Ruby programming and tutorial on ruby programming usage
The use of the return, break, and next keywords involves the issue of jumping out of the scope. Their difference lies in the different scopes of different keywords jumping out, because there are code blocks, you need to pay special attention to them.ReturnCommon Methods
Generally, the return statement is the same as
Example parsing for Hook methods in Ruby and ruby hook instance Parsing
By using the Hook method, we can intervene in the life cycle of Ruby classes or modules, greatly improving programming flexibility.The following hook methods related to lifecycle are available:
Classes and modules
Class # inherited
Module # include
Module # prepended
Module # extend_
Let's get back to our jukebox for a moment (remember the jukebox ?). At some point
We'll be working on the code that handles the user interface-the buttons that people
Press to select songs and control the jukebox. We'll need to associate actions
Those buttons: press START and the music starts. It turns out that Ruby's blocks are
A convenient way to do this. Let's start by assuming that the people who made
Hardware implemented a Ruby extension that gi
1. Debug comment Print output debugRuby is an interpreted language, a script, and on Linux, scripts cannot be executed in three ways:1. Run the script with the interpreterInterpreter script FileThat is:Ruby script File2. Run the script directlyIn the script file, use the#! Script InterpreterDefine the script interpreter path, then grant the script execute permission, then run directly./script FileCan.3. Run the script inside the interpreter[Email protected]:/home/ywt/ror_tests/ruby_tests# irb
The example explains the Hook method in Ruby and adds a hook to the method call. The example explains ruby.
The Hook method is similar to the event-driven device. You can execute a specific callback function after a specific event occurs. This callback function is the hook method (more vividly described: The Hook method can be like a hook, hook up a specific event .), In Rails, The before \ after function i
Detailed description of the code block and parameter transfer in Ruby, detailed description of ruby code transfer
1. Block DeclarationAfter the function is called, the block declaration is enclosed by {...}, Or do. end encapsulation. {} Is generally used in single-line statements, and do... end is used in multi-line statements.
(1 .. 4). each {| v | print "# {v}"} # output 1 2 3 4
Blocks can contain paramet
The example parses the value types and constants in Ruby AND the ruby numerical constants.
Number)Integer)There are two types of integer types. If the value is within 31 characters (four bytes), it is a Fixnum instance. If the value is exceeded, it is a Bignum instance.The integer ranges from-230 to 230-1 or-262 to 262-1. Integers in this range are Fixnum-like objects, and integers out of this range are sto
Ruby class inheritance, abstract classes, class expansion, proxy class instances, ruby instances
Summarize the class extensions encountered in the work:
1. class inheritance:
When multiple classes share many methods, you can extract the public methods and inherit the required classes.
Example:
Copy codeThe Code is as follows:Class A DefP "it was"EndEnd
Class B End
Class C End
B. new. a # => "it was"C. new.
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