Ruby

Let's look at a more interesting program. This time we're going to test whether a string matches a description produced by the Concise pattern (concise) encoding. In these patterns, some characters or character combinations have unique meanings,

Let's write a function that calculates the factorial. The mathematical definition of factorial is as follows: N! = 1 (when n==0) = n * (n-1)! (Other cases) In Ruby, you can write this: Copy Code code as follows: def fact (N) If

First, the methodRuby's method definition allows you to set a default value for a parameter, but you cannot have a parameter without a default value after an argument with a default value (Allow * and &), meaning that the following method definition

We know the top-level domain, what is the self of the domain defined? Copy Code code as follows: Puts self #main Puts Self.class #Object We know that when a method is invoked, if there is no object to accept, the default is

Longest public subsequence, LCS, dynamic programming implementation. #encoding: Utf-8 #author: Xu Jin, 4100213 #date: Nov, #Longest-commom-subsequence #to find a longest commom subse Quence of two given character arrays by using LCS algorithm #

First, traversing all files under the folder, output file name Copy Code code as follows: def traverse_dir (File_path) If File.directory? File_path Dir.foreach (file_path) do |file| If file!= "." and File!= "..."

An iterator is nothing but a collection of methods supported. An object that stores a set of data members is called a collection. In Ruby, arrays and hashes can be called collections. The iterator returns all the elements of a collection, one after

Ruby and Python are too similar, and most of the trade-offs are a reason for personal preference. For example, I feel that Python's "There is" just one way to do it. "Better than Ruby's There are many to do it." It's not just about teamwork, it's

The string in the Ruby language is mutable, unlike a string in Java, C #, which is immutable. Like what Copy Code code as follows: str1= "ABC" str2= "ABC" In Java, for literal strings, a table is maintained inside the JVM,

In terms of technology alone, Ruby is really cool, making the programmer's job a fun and easy task!The following code shows how to find the prime number within 100: Copy Code code as follows: Using System; Namespace Mersenne {

The code is as follows: Copy Code code as follows: Require ' date ' Day = Date.new (2008, 2,-1) End_of_month = Day.strftime ('%d '). to_i Year_and_month = Day.strftime ('%y%m ') For today in 1..end_of_month do P sprintf ('%s%02d ',

1. Search first and then execute, otherwise the first line of execution program 2. function definition, class definition, module definition execution, causing these things to be defined 3. The statement that causes the program to exit, or to the

The new version of Will_paginate has abandoned this practice, instead of using the gem approach, this article through the establishment of a foobar application to understand the use of will_paginate. ============================== C:\>rails foobar-

Like Ruby Metaprogramming, puppet and chef use a lot of Ruby's language features to define a new deployment language.Share a few in the actual project used in the scene, limited capacity, if there is a better program, please leave a message to me:

First, let's take a look at Newrelic's report. Average response time of the last 24h Those pages with high traffic (Action) Access to several Action cases: Topicscontroller#show Userscontroller#show (more miserable, mainly GitHub API

In older versions of Ruby, the return value of an assignment statement is the return value of the method that sets the property. In Ruby1.8, the value of an assignment statement is always the value of the parameter and the return value of the method

If you test the RESTful service by hand, it will be very tedious. Of course, there are some browser plug-ins that can help you manually test by using a visual interface, such as postman, rest console, but every time a system version is updated, you

Some time ago to see a lot of people write the next sister script, I also write a Module Commonhelper require ' Nokogiri ' require ' Open-uri ' def down_load_xmz site_url = ' http:// Www.xxx.com "for index_page in 1..141

In the rails principle there is the idea of simplifying controller, enriching model. A simple inheritance optimization is shown below with an example. Especially when you have a change self variable in your method. Suppose we have the following

Minitest, a new generation of ruby testing framework, has become the built-in test framework for Ruby 1.9, and it is said to be the default test framework for Rails 4, promising. Minitest Why is the latest Ruby and Rails preferred, and what are the