I have something to say about the buzz word "From Java to Ruby"

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  • 1. RubyKaigi2008 LightningTalk:I have something to say about the buzz word "From Java To Ruby" Java Ruby makoto kuwata http://www.kuwata-lab.com/ copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 2. ATTENTION‣ This session is not related with the book "From Java to Ruby" at all. Java Ruby‣ Content of this session is completely my original. copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 3. What goes "From Java To Ruby"? Java Ruby ? Change your code from Java to Ruby Java Ruby Change your mind from Java to Ruby Java Ruby Write in Ruby ≠ Think in Ruby Ruby ≠ Ruby copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 4. Write in Ruby ≠ Think in Ruby Ruby ≠ Ruby‣ 10 years ago: Cobol programs written in Java syntax 10 : Java Cobol‣ Now: Java programs written in Ruby syntax : Ruby Java Is history repeating itself? ? copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 5. Change your mind about "Project"‣ It is stupid to overemphasize beginners • Dont shackle experts‣ It is much stupid to brag how large your project is • Proud how much your system make people happy copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 6. Overemphasis of beginners is stupid Rubys main target Javas main targetProgrammers Experts BeginnersOutcome, Gain 80 20It is those who get large gain that should be taken count of copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 7. Dont shackle expertsA students code: out.print(ans < yourans ? "smaller" : "bigger");A famous Java teacher says: Java You should use "if" statement because ternary operator is not easy to understand for everyone. if http://www.seshop.com/genba/yazawa/archives/06.asp Dont leave beginners as beginner copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 8. Bragging about project size is much stupid What is large? ( ?) • Data size ( ) • Code size ( ) ←BAD • Number of users ( ) • Number of developers ( ) ←BAD "Large code" and "many developers" are the result of a lack of ability and effort to simplify copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 9. Lack of ability & effort to simplify‣ Develop common features individually • Example: Implement internationalized address form of customer, supplier, employee, ... in different way respectively. : … copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 10. Lack of ability & effort to simplify (cont) ‣ Ballooning features due to bad design • Example: name-identification between suppliers and customers is required to support balancing out of credit and debit, because master tables of suppliers and customers are not integrated. : copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 11. Conclusion‣ Change your mind "from Java to Ruby" Java Ruby • Write in Ruby ≠ Think in Ruby Ruby ≠ Ruby • It is stupid to excessive emphasis to beginners • It is much stupid to brag how large your project is Think by yourself copyright(c) 2008 kuwata-lab.com all rights reserved.
  • 12. Thank youcopyright(c) 2008 kuwata-lab.com all rights reserved.