Ruby

Through the previous lecture, we have some knowledge about the basic framework of rest on rails, but how does it return different types of resource representations Based on the client request type? This is what we want to talk about. The secret lies

The fruit class in the previous section has two real variables, indicating the fruit type and status respectively. it was not until we wrote a customized inspect method for this class that we knew it would not give a reasonable explanation of a

The ruby unless expression runs only when the condition is false.CodeBut it does not understand the logic combination with the condition "& |". Whether it is false or false to run the unless code block, or false | false to continue running. In fact,

Reference books: Agile web development with rails 4th Edition Create a new website and create some default directories and files: $ Rails new Start the server and run the following command in the project directory: $ Rails Server Default

1. First read the object_id of the string. Str1 = "anleb" str2 = "anleb" puts str1.object _ idputs str2.object _ id Output:2295250022952490 Different IDs indicate that objects have the same values, but they are different. What is different,

Ruby is... A dynamic, open source programming language with a focus on simplicity and productifunctionality. It has an elegant syntax that is natural to read and easy to write. Translate and organize documents of common Ruby libraries, and

This rexml library can be used for parsing XML documents in ruby. The rexml library is an XML toolkit of Ruby. It is written in pure Ruby and complies with the xml1.0 specification.In ruby1.8 and later versions, the ruby standard library will

From a stranger to a preliminary understanding; from reading to hands-on practice, I want to say, you are very beautiful! Ruby is a pure object-oriented scripting language developed by yukihiro Matsumoto in Japan. This language is designed to

Local variables start with lowercase letters or underscores (_). Local variables do not include nil values before initialization like global variables and real variables. Ruby> $ fooNilRuby> @ fooNilRuby> fooErr: (eval): 1: undefined local

Demo Code : [Code] #! /Usr/bin/ENV Ruby Count = 10 Require 'benchmark' $ Account_chars = ('A' .. 'Z'). to_a.delete_if {| c | C = ~ /[Aeiouy]/} # $ Password_chars = ('0'... '9'). to_a $ Password_chars = array. New $ Password_chars [0 .. 9] = ('0'...

Use before_invocation to verify the call permission API Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Class blogapi Api_method: hello_world, : Expects => [{"password" = >:string}, {"user" =

As ruby is a pure object-oriented language, everything is an object. methods are objects and classes are objects ..., therefore, self has many environments. Only by distinguishing the meanings of self in different environments can we better

Let's look at a more interesting program. This time we will test whether a string matches the description produced by concise pattern encoding. In these pattern modes, some characters or character combinations have unique meanings, including: Copy

Life cycle: Yukihiro Matsumoto was born on February 1, April 14, 1965 in Tokushima Prefecture, Japan. In 1984, he studied at the Department of Information, the third discipline of zhubo University. Two years later, I will be absent from school and

The real world is full of objects. We can classify them. for example, when a very small child sees a dog, no matter what type it is, they will be called "bow-wow". We are born to have the ability to understand the world by type.In terms of OO

Global variables start with $. They can be accessed anywhere in the program. Before initialization, the global variables have a special value nil.Ruby> $ fooNilRuby> $ foo = 55Ruby> $ foo5Use global variables with caution. they are quite dangerous

An unexpected problem occurs in a running program. A file to be read does not exist. When you want to store some data, the disk is full. You may enter inappropriate data.Ruby> file = open ("some_file ")ERR: (eval): 1: in 'open': No such file or

When a method ends, we may need to clean it up. maybe an open file needs to be closed, and the data in the buffer zone should be cleared. if there is always only one exit point for each method, we can safely put our cleaning code in one place and

KeywordsDef undef method definitionModule DefinitionClass DefinitionDefined? Check typeConditional statement if, then, else, elsif, case, when, unlessLoop statements for, in, while, until, next, break, do, redo, retry, yieldLogical judgment not, and,

The Code is as follows:Copy codeThe Code is as follows:Require 'date'Day = Date. new (2008, 2,-1)End_of_month = day. strftime ('% D'). to_ IYear_and_month = day. strftime ('% Y % m ')For today in 1 .. end_of_month doP sprintf ('% s % 02d',