book of ruby

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

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.

I've been working on Ruby for a while and have recently had some leisure events, learning about Ruby and preparing for future Ruby on Rails development.Ruby was founded in 1993 by as of Japan (まつもとゆきひろ/yukihiro Matsumoto). In contrast to chatty's development language such as Java, Ruby can be said to be small and beaut

[Ruby on Rails Learning 1] ubuntu14.04 configure rvm and ruby, ubuntu14.04rvm To install ruby, you must first install rvm. Rvm is Ruby Version Manager, a command line tool developed by Wayne E. Seguin. Rvm allows you to easily install and manage ruby productivity environmen

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 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 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

Introduction to Ruby operators and statement priority, ruby operator priority Ruby is a language with strong expressive power. It is proud of its rich operators and syntactic sugar. Although Ruby has always regarded the principle of least surprise as one of its philosophies, but it is often surprising that it is diffic

Object array sorting in Ruby and Ruby object array sorting Sorting of Ruby object arrays The author has just come into contact with Ruby, because he previously thought that the script language syntax is not standardized and he is somewhat biased against the script language. For example, he does not need to learn PYTHON

Ruby string and array maximization problems, ruby Problems Max Method b=[1,3,55,777,2,4,6,8,0] For numeric data, max obtains the maximum value of the array, and min obtains the minimum value of the array. b.max => 777b.min => 0 It has no practical significance for comparing the size of string arrays,The example in ruby is # enum.max -> obj# enum.max { |a,

Ruby uses the proxy mode and decoration mode code instance in the design mode, and the ruby Design Mode Proxy Mode Requirements: James asked Xiao Li to chase Xiao Li for him (send dolls, flowers, and chocolate) No proxy code: #-*-Encoding: UTF-8-*-# suer class Pursuit attr_accessor: mm def initialize (mm) @ mm = mm end def give_dolls puts "# {mm. name} Show you the doll "end def give_flowers puts" # {mm. na

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 powerful matching language, regular expressions are increasingly used in different fields, from string verification, m

Three methods for executing periodic tasks (scheduled tasks) IN ruby: ruby periodic 1. Preface Whether using ruby for system management or using rails for web development, periodic tasks may occur. They are scheduled to take a certain period of time (1 hour, 2 days ......) continuously triggered. In ruby, I think it is

Ruby vs Python advantages and disadvantages, ruby vs python Ruby and Python are too similar, and most of the trade-offs are personal preferences. For example, I think Python's "There is only one way to do it. "than Ruby's" There are always ways to do it. "Well, it's not just about team collaboration. More importantly, you can quickly understand what code you wrot

Ruby 7-day entry (2 functions, arrays and classes), ruby 7-dayDAY 2 Continue the next day. Today we will focus on the basic elements of functions, collections, classes, and other programming.2.1 simple definition of function 2.1.1 def tell_me puts true end Defining a simple function (No parameter and no return value) is simple. Use def end to wrap the function body. 2.1.2 Parameters def tell_me(a)puts ae

Array usage in Ruby, ruby array usage Ruby arrays are ordered. What about any object ?? The set of integer indexes. The elements in each array are associated and an index is mentioned. Array subscript starts from 0, such as C or Java. Negative index assumes that the end of the array --- that is,-1 indicates the array index of the last element,-2 is the next eleme

Some basic operations on Ruby processing time, And ruby processing basic operations Get the current date and time: The following is a simple example to get the current date and time: #!/usr/bin/ruby -wtime1 = Time.newputs "Current Time : " + time1.inspect# Time.now is a synonym:time2 = Time.nowputs "Current Time : " + time2.inspect This produces the following res

is not a professional web crawler crawling, just before a very bad site to help people brush the ticket started to learn the web crawler tools.The initial time is to use the Python urllib2, get the page when the text processing, later in the forum to see the Beautifulsoap this level of artifact, Python processing this is really convenient, but later I met the Ruby and rails, from the faithless, Even read the metaprogramming

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

This section describes the regular expressions and Ruby Regular Expressions in ruby. A regular expression is a character of a special sequence. It matches or searches for other strings or string sets by using a pattern with special syntax.Syntax A regular expression is literally a pattern between a slash or any separator following % r, as shown below: /Pattern // pattern/im # You can specify the option % r!