Ruby

1. Search for the begin statement first, and execute the statement if it is found; otherwise, execute ProgramThe first line 2. When it comes to function definitions, class definitions, and module definitions, these things are defined. 3. Run

The fruit class in the previous section has two real variables, indicating the fruit type and status respectively. it was not until we wrote a customized inspect method for this class that we knew it would not give a reasonable explanation of a

We always want to classify unknown events. When it happens, pass a piece Code Is the easiest solution, that is, we want to process code like processing data. A new process object can be created through proc: Ruby> quux = proc {| Print

Ruby processes strings like numbers. We enclose them with 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

1. send messages to the object We can directly send messages to objects: Ruby Code Copy code The Code is as follows: Class helloworld Def say (name) Print "hello,", name End End HW = helloworld. New HW. Send (: Say, "world ") We usually use HW.

Let's look at a more interesting program. This time we will test whether a string matches the description produced by concise pattern encoding. In these pattern modes, some characters or character combinations have unique meanings, including: Copy

The iterator was not invented by Ruby. it is widely used in various object-oriented languages. this is also true in Lisp. even so, the concept of iterator is not familiar to many people, so we will give a more detailed introduction here. You know,

Ruby has some special modules that are useful. For example, the Ruby module OpenURI introduced here is a common Ruby module. We need to be familiar with its features. Ruby on Rails directory files Ruby function pointer concepts Ruby Rmagick

BKJIA exclusive Article] With the rapid development of computers, more and more programming languages have emerged. In the past 10 years, due to the speed of development, Java has become the leader in programming languages. As Java continues to

To install Ruby, go to the Ruby official website to download the Windows Installation Package of Ruby1.56. After installing ruby, open the Dos window and enter Ruby-v to display it.Ruby 1.8.6 (patchlevel 0) [i386-mswin32] indicates that Ruby has

What is a method? In OO programming, we do not want to directly manipulate the data of an object from the outside; on the contrary, the object itself knows how to manipulate itself (when properly requested ).You may say that we pass a message to an

In the subclass, we can modify the object behavior by reloading the parent class method.Ruby> class Human| Def identify| Print "I'm a person. \ n"| End| Def train_toll (age)| If age | Print "CED fare. \ n ";| Else| Print "Normal fare. \ n ";| End|

The behavior of an object depends on its class, but we often know that a specific object requires a specific behavior. in many languages, we have to get into the trouble of defining another class, even if it is only used for the next ing. in Ruby,

We always want to classify unknown events. When it happens, passing a piece of code as a parameter to other methods is the easiest solution, that is, we want to process code like processing data.A new process object can be created through proc:Ruby>

Global variables start with $. They can be accessed anywhere in the program. Before initialization, the global variables have a special value nil.Ruby> $ fooNilRuby> $ foo = 55Ruby> $ foo5Use global variables with caution. they are quite dangerous

The Fruit class in the previous section has two real variables, indicating the Fruit type and status respectively. it was not until we wrote a customized inspect method for this class that we knew it would not give a reasonable explanation of a

KeywordsDef undef method definitionModule DefinitionClass DefinitionDefined? Check typeConditional statement if, then, else, elsif, case, when, unlessLoop statements for, in, while, until, next, break, do, redo, retry, yieldLogical judgment not, and,

# Scanweb. rb# Use ruby scanweb. rb www.jb51.net to save the current result in c: \ 1.txtRequire 'net/http'Filename = File. new ('C: \ 1.txt ', "w + ")If $ * [0] = nilPuts "hehe, no URL entered"ElseH = Net: HTTP. new ($ * [0], 80)Resp, data = h. get

Some important differences between ruby and c # are as follows:1. ruby is a dynamic language, and c # Is a static language-that is, after an object is new, ruby can dynamically add some attributes or methods to the object instance (as does

The String in Ruby is mutable, unlike the String in java and C # is immutable. For exampleCopy codeThe Code is as follows:Str1 = "abc"Str2 = "abc" In java, for literal strings, the jvm maintains a table internally. Therefore, in java, str1 and str2