Ruby

1 Get the list of defined entities Ruby's Reflection API enables us to detect classes and objects at runtime. So we'll introduce some of the methods of the definitions in module, Class, and object below. module modules have a constants method that

First, Introduction Since the advent of Ruby on Rails last year, interest in the Ruby programming language seems to have grown steadily. Rails has helped people see what Ruby is: A very decent, easy to learn and fun-filled language, even for the

Object-oriented programs involve classes and objects. A class is a blueprint that is created from an individual object. In object-oriented terms, we say that Xiaoming's bike is an object instance called a bicycle class. Examples of any vehicle. It

Ruby is an open source dynamic programming language that has beautiful syntax for building scalable Web applications. Ruby Gems can be a good way to improve the development efficiency of ruby developers. There are several ways to install Ruby on an

Ruby provides a complete set of I/O-related methods that are implemented in the kernel (Kernel) module. All I/O methods derive from the IO class. Class IO provides all the underlying methods, such as read, write, gets, puts, ReadLine, getc, and

In the rule engine, Ruby's closures are particularly frequent, and there are several forms of usage, such as block,proc and lambda, that are confusing. In order to get a deeper understanding of the code, and again carefully learn Ruby's closure,

Ruby's Literal builder Most of Ruby's built-in classes can be instantiated using new: str = string.newarr = array.newSome classes cannot be instantiated using new, such as the Integer class. Some built-in classes can use a literal constructor, or

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

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

ObjectiveIn the previous section we covered constants and the use of variables, which we started with to introduce some of the basic types in Ruby.numeric types (Fixnum, Bignum, Float)Ruby's numeric types include integers and floating-point numbers.

In the Ruby language, the specific differences between Class_eval and Instance_eval are obvious, Class_eval is for a class object, and the instance method can be defined in this object. While Instance_eval is for an object, the class opened is

Detailed description of matching and replacement operations on strings by regular expressions in Ruby, and ruby Regular Expressions Regular Expression matching Speaking of Ruby, of course, we need to mention its regular expression mechanism. As a

ActiveRecord programming guide in Ruby on Rails, rubyonrails Avoid modifying the default ActiveRecord (Table Name, primary key, and so on) unless you have a very good reason (such as a database not under your control ).Put the macro-style method

Ruby connection uses the SQL server database code instance in windows, rubysql require 'win32ole'class SqlServer # This class manages database connection and queries attr_accessor :connection, :data, :fields def initialize @connection = nil

Tutorial on creating and using hash in Ruby and ruby hash Hash is a set of key-value pairs similar to "employee" => "salary. Hash indexes are completed by any key of any object type, rather than an integer index. Others are similar to arrays. The

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

Ruby-based watir-webdriver Automated Testing Solution and implementation (1), watirwebdriver Why is automated testing required?• Objective Requirements for increasingly complex application systems An inevitable problem is that application systems

Ruby uses the Monkey Patch Monkey Method for program development example, rubymonkey Monkey Patch is a special programming technique. Monkey patch can be used to dynamically modify (expand) classes or modules at runtime. You can add a Monkey Patch

Ruby on Rails internationalization, rubyrails Language-related settings and strings should not be used in views, models, and controllers. The text should be moved to the language file under config/locales. When the tags of the ActiveRecord model

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