Ruby

This side is just a general, specific to see the document itself. 1 Connection SQLite: Require ' SQLite ' db = SQLite::D atabase.new ("library.db") db.execute ("Select Title,author from　Books ") Do |row| p row end db.close　　　　　 2 connection

Rake Introduction Rake means Ruby make, a code-building tool developed with Ruby. But why does Ruby need rake? It's supposed to be that Ruby code doesn't need to be compiled, so it doesn't have to be rake. It turns out, rake has another magical

A string object in Ruby holds and manipulates one or more bytes of any sequence, usually representing the character representation of the human language. Simple string literals are enclosed in single quotes (single quote characters). String value

Skynet is a very loud name because it is the super computer network that dominates humanity in the classic series "Terminator" starring Arnold Schwarzenegger has. But this article's Skynet is not so scary, it is a ruby version of the Google

I've been learning about rails, because learning Java is an introductory language. It's a bit of a bad fit. In particular, Ruby's hash. But it's just a matter of thinking it through. It's basically a key-value. There is no big problem with writing

Ruby Global Variables Global variables begin with $. The value of an uninitialized global variable is nil, and a warning is generated when the-w option is used. Assigning a value to a global variable changes the global state, so it is not

Ruby's constant lookup path problem is a problem that's been bothering me, in the work encountered several times, has not thoroughly understand why, recently read a book "Ruby Metaprogramming", the Ruby object model has a deeper understanding, and

The first character of the Ruby variable name determines whether it is a local variable, an instance variable, a class variable, a global variable, or a constant. Typically, the second character of a variable name is a number, a letter, or an

Tutorial Requirements The following techniques and resources are required to learn this tutorial: Database server NetBeans IDE 6.0 with Ruby support To create a sample database This tutorial builds the relationship between the Rails model based

Active support is a set of libraries provided with rails, active support extends some of the classes in Ruby, and this time we'll look at some of the most common features. 1. Extension of the number type The Fixnum class adds two methods: even and

Today your leader to find you, hope you can help him a little busy, he is now anxious to go to the meeting. What can I do for you? You're curious. He said to you, the current database of your project has a user information table, which contains a

Configure the Ruby environment before installing cocoapods, this article summarizes how to install the ruby environment. Installing the ruby environment requires first installing Xcode and then installing homebrew, and then installing RVM to install

In fact, Ruby Write API program is very simple, if the API itself is relatively standard, rather than a mess.class apidemo    #  Defining Interfaces   API_QERUY = [       :userAdd               #  User profile Add   ]    #  implement Ghost Method

Demandfunction, you need to pass a string through a parameter to do a regular match' [0-9]+ ' def func (str, reg) Str.scan (reg) EndSince Reg is defined elsewhere, Reg is a string, which is found to be unable to be used directly for regular

Ruby is a gentleman in computer language, if you want to use a word to describe, it must be elegant, there is such a rubyist, his motto is "Write elegant program, do an elegant person", he is from seven cattle small partner "mint" Co-founder and CTO

Example tutorial on Parsing JSON data in Ruby and Ruby on Rails, railsjson Ruby parses JSONExample of Json parsing IN Ruby: Json = '["a", "B", "C"] 'puts "Unsafe # {unsafe_json (json ). inspect} "# output Unsafe [" a "," B "," C "] Ruby parses Json

Ruby syntax notes, ruby syntax Accept user input first_name = gets.chomp Uppercase letters first_name.capitalize! Uppercase letters first_name.upcase! Lower letters first_name.downcase! Multi-row output Print Note # I am a comment Variable

An example is provided to explain the regular expressions in Ruby and the regular expressions in ruby. A regular expression is a special character sequence that can help match or find other strings or strings. The pattern used maintains a special

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

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