Ruby

The string in the Ruby language is mutable, unlike a string in Java, C #, which is immutable. Like what str1= "abc" str2= "abc" In Java, for literal strings, a table is maintained inside the JVM, so if in Java, str1 and str2 are the same string

Basisinserts a record into a sorted table to get an ordered table with an additional record. And the most important point is that it moves the record larger than the current element back, to empty out the position of "own" the insertion. The record

A constant begins with a capital letter. It should be assigned up to one time. In the current version of Ruby, the re-assignment of constants produces only warnings rather than errors (the Non-ansi version of EVAL.RB does not report this

Now let's analyze the code of some of the previous example programs Bache. The following example appears in a simple Example section. def fact (N) If n = 0 1 Else n * Fact (N-1) End End print fact (argv[0].to_i), "\ n" Because this is the first

Accept user Input First_Name = Gets.chomp Capitalize first letter first_name.capitalize! Uppercase letters first_name.upcase! The letter becomes lowercase first_name.downcase! Multi-line output

Ruby annotationNote hides a row for the Ruby interpreter, or part of a line, or several rows. You can use the character (#) at the beginning of the line: # I'm a note, please ignore me. Alternatively, the annotation can follow the same

A single line string that needs to be interpolated and embedded with double quotes uses% () (abbreviated as%Q). Multi-line string, preferably with Heredocs. # bad (no interpolation needed) % (some text) # should to be ' some text ' #

Name an identifier in English. # bad-identifier using non-ascii characters заплата= 1_000 # Bad-identifier is-a Bulgarian word, written with Latin letters (instead of Cyrillic) Zaplata = 1_000 # good salary = 1_000 Name

RVM is a command-line tool that provides the management and switching of a convenient, multiple-version Ruby environment. https://rvm.io/ If you are going to learn ruby/rails, RVM is one of the essential tools. All commands here are operated

Regular expressions are a special sequence of characters that can help match or find other strings or string sets, using patterns that maintain a specialized syntax. The regular expression literal is a pattern between a slash or any delimiter%r as

1. Japanese Turn UTF-8The difference between iconv.new (' cp932 ', ' utf-8 ') and iconv.new (' Shift_JIS ', ' utf-8 ') Iconv.new (' Shift_JIS ', ' utf-8 ') does not support the following format: Class №001-18 XXXXXXX and can only change the

Recently there is a need to show the number as a fixed number of digits, the number of digits in the front with 0 supplements Like 5-bit: Copy Code code as follows: 3-> 00003 292-> 00292 12422-> 12422 It's easy to find Ruby.

Ruby gives us six ways to complete a task when we encounter the need to invoke the operating system shell command: 1.Exec Method: The Kernel#exec method replaces the current process example by invoking the specified command: Copy Code code

# Coding:utf-8Require ' OpenSSL 'Require ' base64 '#des加密并且base64编码def Des_encrypt Des_key, Des_text Des =openssl::cipher::cipher.new ("DES-ECB") Des.encrypt Des.key=des_key des_text= "#{des_text}" result = Des.update (Des_text) Result

Basic Learning Ruby--Basic Learning (i) Project folder description Ruby-Basic Learning (ii) foreign key configuration for cascading deletions Ruby-Basic Learning (c) Setting time in China timezone Ruby--Basic Learning (iv)

RVM is the acronym for Ruby version Manager and is a command-line tool that allows you to easily install, manage, and use multiple versions of Ruby. Different rails projects use RVM to switch freely when using the same version of Ruby and

Introduction to the adapter mode of Ruby Design Mode Programming, and the ruby Design Mode Adapter ModeThe adapter mode can be used to encapsulate different interfaces and provide unified interfaces, or make an object look like another type of

Use Ruby to write HTML scripts to replace the example sharing of applets. A file contains the following content: select D for this question ............. The function I want to implement is to replace it: select D ................ This seems a

Using MVC thinking to understand the design structure of the Ruby on Rails framework, rubyrails In rails, the process of sending a request (/users) is as follows:1). the browser sends a request (/users)2) Rails routes requests to the index method of

Ruby captures web images and ruby captures images. Some time ago, I saw a lot of scripts written by my sister, and I wrote one myself. Module CommonHelper require 'nokogiri 'require 'open-uri 'def down_load_xmz site_url = "http://www.xxx.com" for