Interpreting the usage of annotations in Ruby and interpreting ruby annotations
The Code Annotated In the Ruby line is ignored at runtime. Single line comment # starts with the characters. They start from # To the end of the line as follows:
#! /Usr/bin/ruby-w # This is a single line comment. puts "Hello,
A simple tutorial on JSON Processing Using Ruby, and a json tutorial on ruby Processing
Environment Configuration
Before using Ruby to encode or decode JSON data, we need to install the Ruby JSON module. Before installing this module, you must first install Ruby gem. We will
Recommended syntax style in Ruby programming, and ruby programming syntax Style
Use: Reference constants (including classes and modules) and constructors (such as Array () or Nokogiri: HTML ()).Never use: to call methods.
# bad SomeClass::some_method some_object::some_method # good SomeClass.some_method some_object.some_method SomeModule::SomeClass::SOME_CONST SomeModule::SomeClass()
Enclose def pa
Ruby is a powerful object-oriented scripting language that allows you to easily and quickly perform object-oriented programming. sometimes using formal object-oriented languages such as Smalltalk, Eiffel, and C ++ to develop small projects seems a little complicated. Ruby can meet these object-oriented programming needs. of course, you can also use Ruby for gener
people or even remote collaboration. This large-scale team collaboration requires that the programmer's code style must be highly consistent, and the dependencies between code blocks must be minimized. Obviously, the rigid and easy-to-decouple Java is very qualified.2. batch production needsThe current software outsourcing industry is particularly evident! You don't need your creativity, you don't need your design, you need your coding, and the coding style and functions are no longer required.
Notes for variable reference IN Ruby: Ruby variable reference
In the expression, when Ruby sees a name like a, it needs to determine whether a is a local variable reference or a call to method a without parameters. Ruby uses a heuristic method to determine this situation. When Rub
I have recently considered a lot of metaprogramming (metaprogramming) issues and would like to see more examples and explanations of this technology. For better or worse, Metaprogramming has entered the Ruby community and is a standard way to accomplish various tasks and simplify code. Since I can't find this kind of resources, I'm going to start writing some general Ruby technology articles. These may be u
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
A Date and Time Processing tutorial in Ruby and a date Processing tutorial in ruby
The Time class is used in Ruby to represent the date and Time. It is based on the system date and time provided by the operating system. This type may not represent the date before or after January 1.
This tutorial will familiarize you with all important concepts of date and time.C
Analysis of Ruby source code layout and programming style, analysis of ruby source code Layout
Use the UTF-8 as the source file encoding.
Each indentation level uses two spaces (also known as soft tabs). Do not use hard tabs
# bad - four spaces def some_method do_something end # good def some_method do_something end
Use Unix-style line breaks. (* Users of BSD, Solaris, Linux, and OSX are covered
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
Select Mac > Linux > Windows If you can, it's best not to toss Rails under Windows, and you'll waste a lot of time solving some puzzling problems that might never happen under Linux or MAC. Development tools Select Mac under the TextMate, because free; second Sublime Text 3; Macvim again, and finally an IDE rubymine. Sublime Text 3 or VIM is recommended under Linux and Windows, and can also be used with rubymine. Ruby version selection recommended
Ruby learning plan-(0) preface, ruby Preface
Preface
Currently, C, C ++, Java, Object-C, and Swift programming languages have been used. The most familiar language is oc. After all, it depends on him for dinner. It is only a beginner's path for other languages. Because he has been engaged in iPhone app development, recently, I wanted to develop a project by myself, but there was no backend, so I was so
Global variable $ XX
Object variable @ xx
Local variable [A-Z] xx
Constant [A-Z] xx
Two pseudo variables self and nil:Self is actually a global variable pointing to the current object. The value of this variable is controlled by the interpreter and can only be read and cannot be modified.Nil is also a global variable controlled by the interpreter and cannot be assigned a value.
1. Global variable $ XXGlobal variables should be used with caution because their scope is script-level and can
record all of the scripts again.
So is there any way to overcome the above problems and make the work easier? The answer is YES!
For example, an online electronic bookstore, for users to buy the book scene, we can use the following script for integration testing:
Login ' test@test.com ', ' pass4you '/LoginList_books//List of booksAdd_to_shop_cart ' Who says elephants can't dance '//Add to the cart the book
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
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