Category：Ruby
-
Time：2020-9-23
A variable is a storage location that holds any data that can be used by any program. Ruby supports five types of variables. General lowercase letters, the beginning of the underline: variable. $starts with: global variable. @Beginning: instance variable. @@Start: class variables are shared in the entire inheritance chain Start with a capital letter: constant. […]
-
Time：2020-9-22
Ruby is a pure object-oriented language. Everything in ruby is in the form of objects. Every value in ruby is an object, even the most primitive things: strings, numbers, even true and false. A class itself is an object, an instance of a class. This chapter will show you all the main features related to […]
-
Time：2020-6-17
1. Print does not automatically wrap lines, and puts will automatically wrap lines. If a line is not enough, you can add “\” to connect Ruby code puts 6/2 Operation result: Ruby code Three 2. = =, EQL? Equal? Difference ==Equal value equal value equal value equal type equal value equal memory address equal A=1 […]
-
Time：2020-6-16
Here you can download the latest Ruby Version for you. The current stable version is 1.8.6. Please read before downloadingRuby open source license 。 Ruby source code If you want to make it more compatible with your platform or need to set up your environment specifically, installing from source is the best solution. This is […]
-
Time：2020-6-15
Ruby doesn’t have many books. I collected these books from the Internet. Download them and click the picture directly Programming ruby, Second Edition: an introduction to ruby, Second Edition, required reading for learning Ruby (UPDATED)Agile web development with rails: beta 2. Based on rails 1.2 (UPDATED）The ruby way is now the second version updated to […]
-
Time：2020-6-14
For Ruby installation, you can go to the official website of ruby to download the windows installation package of ruby 1.56. After installation, open the DOS window and input ruby-v display Ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-mswin32] indicates that Ruby has been installed successfully. The version number is ruby 1.96. After installation, ruby-186-20 appears […]
-
Time：2020-6-13
All of a sudden, ruby is also good. I’m going to learn itintroduceThis is a short introduction to ruby. It only takes 20 minutes to read it completely. Let’s assume that the reader has installed ruby. If you haven’t, please visit the official Ruby website to download and install it before reading this article. Interactive […]
-
Time：2020-6-12
1、 Methods Ruby’s method definition allows setting default values for parameters. However, parameters without default values (allow * and &) cannot appear after parameters with default values. That is to say, the following method definitions are not allowed. Parse error will appear during interpretation. Another difference from C is that method definitions cannot appear after […]
-
Time：2020-6-10
Ruby is a powerful object-oriented scripting language, which can make you easily and quickly carry out object-oriented programming. Sometimes it’s a bit of a fuss to develop some small projects with formal object-oriented languages such as Smalltalk, Eiffel or C + +, and Ruby just can meet these requirements of object-oriented programming, You can also […]
-
Time：2020-6-9
First, you need to check whether ruby is installed. At the shell prompt (in this case, it means “%”, so don’t type%), type % ruby -v (- V tells the interpreter to print out the Ruby Version), and then click enter. If ruby is installed, you will see the following information: % ruby -v ruby 1.6.6 (2001-12-26) [i586-linux] If ruby is not […]
-
Time：2020-6-8
Let’s write a function to calculate factorial. The mathematical definition of factorial is as follows: N! = 1 (when n = = 0)=N * (n-1)! (other cases) In ruby, you can write as follows: Copy codeThe code is as follows: def fact(n) if n == 0 1 else n * fact(n-1) end end You may find the recurrence of end. Because […]
-
Time：2020-6-7
Ruby treats strings like numbers. We enclose them in single quotation marks (‘…’) or double quotation marks (‘…’) ruby> “abc” “abc” ruby> ‘abc’ “abc” Single quotation marks and double quotation marks have different functions in some cases. A string enclosed by double quotation marks allows characters to be led out by a leading slash, and can be […]
