목차

1. 인트로 _ 18.02.15

1. 이책은 오직 루비언어에대한책이다.레일즈나젬등의툴에대한반영은없다.

2. 루비는 전형적인 객체지향 언어이다. C개발자나 자바 개발자는 비교적 쉽게 접근할 수있지만 쉬운 언어는 아니다

3. 객체지향언어로도 쓰지만 함수지향언어로도 사용가능하다

4. 

5. 신텍스는 표현 중심의언어이다(Expression Oriented)

6. 메소드(Methods)

   • 기본적인 변수선언 방법
7. 수학 함수도 사용가능

8. @ 인스턴스 변수, @@ 는 클래스변수

   • The Ruby Programming Language

     global variables are prefixed with$, instance variables are prefixed with@, and class variables are prefixed with@@.

9. ```ruby

   Determine US generation name based on birth Year

   Case expression tests ranges with ===

   generation = case birthyear

            when 1946..1963: "Baby Boomer"  
            when 1964..1976: "Generation X"  
            when 1978..2000: "Generation Y"  
            else nil  
            end
   

   A method to ask the user to confirm something

   def are_you_sure? #define a method. Note Question mark !
   while true #Loop until we explicitly return

    print "Are you sure? \[Y/N\]: "             \#ask the user a question  
    response = gets                          \#get her answer  
    case response                          \#Begin case conditional  
    when /^\[yY\]/                          \#If response begins with y or Y  
      return true                        \#Return true the method  
    when /^\[nN\]/, /^$/                    \#If response n/N or is empty  
      return false  
      end  
    end  
   

   end

```

• Ruby official site

  • The Ruby Programming Language

    http://www.ruby-lang.org.

• 1.2.5 Ruby Package Management with gem

  • 루비 패키지 메니지

    • gem list # List installed gems
      gem enviroment # Display RubyGems configuration information # Update a named gem
      gem update rails gem update # Update all installed gems
      gem update --system # Update RubyGems itself
      gem uninstall rails # Remove an installed gem

• Ruby Library

  • http://www.ruby-lang.org/en/libraries/

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