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![More Factorial
class Factorial {
private static int fact(int n) {
if (n == 1) return 1;
return n * fact(n - 1);
}
public static void main(String[] argv) {
System.out.println("6!="+fact(6));
}
}
6!=740](https://image.slidesharecdn.com/whyruby-090524054353-phpapp02/85/Why-Ruby-33-320.jpg)
![Simplicity Example
Rakefile
Rake = Ruby Make
task :default => [:test]
task :test do
ruby "test/unittest.rb"
end](https://image.slidesharecdn.com/whyruby-090524054353-phpapp02/85/Why-Ruby-61-320.jpg)
![Simplicity Example
In Simpler Syntax
task({:default => [:test]})
task(:test, lambda(){
ruby "test/unittest.rb"
})](https://image.slidesharecdn.com/whyruby-090524054353-phpapp02/85/Why-Ruby-62-320.jpg)
Uploaded byDaniel Lv
Why Ruby
This document summarizes Yukihiro "Matz" Matsumoto's keynote speech on why Ruby is a good programming language. Matz discusses how Moore's Law has increased computing power and decreased costs, requiring more and better software. He argues that programming languages can influence human thought as much as natural languages. Ruby aims to be a productive, efficient language that is easy to learn and memorable. Its concise and consistent syntax helps reduce errors. Overall, Ruby is designed to be a fun and inspiring language for programmers.
More Related Content
Why Ruby
- 1. RubyConf China Why Ruby? Yukihiro"Matz" Matsumoto まつもと ゆきひろ matz@ruby-lang.org Copyright (c) 2008 Yukihiro "Matz" Matsumoto, No rights reserved thou
- 2. Moore’s Law The numberof Transistors in LSI Doubles Every 18 Months
- 3. Moore’s Law Means: ComputerGrows Exponentially Faster Cheaper More Common
- 4. Faster Computer PCs areFaster than Super Computers of 20 Years Ago
- 5. Cheaper Computers We canBuy a PC for $400 Now
- 6. Common Computers Now EveryoneOwns Computers Personal Computers Cell Phones
- 7. Cell Phone asa Computer
- 8. Cell Phone asa Computer
- 9.
- 10. Influence in Programming Moore’sLaw Changes Software Complexity Programming Languages
- 11. Software Complexity No BusinessCan Be Run without Software We Need More Software Quicker Cheaper
- 12. Humans Don’t Improve Moore’sLaw Does Not Apply to Humans
- 13. Productivity We Need MoreSoftware with Limited Resources
- 14. Productivity We Have FasterComputers Development Efficiency At the Cost of Runtime Efficiency
- 15. Productivity The Most ImportantFactor of Language Evolution Languages are One of the Tools for Productivity
- 16.
- 17. Sapir-Whorf hypothesis Language determinesthe way we think.
- 18. Theorem #1 Languages influence humanthought, more than you think
- 19. Programming Languages Do programming languages influencehuman thoughts?
- 20. Thinking in Programming Language Naturallanguages are too ambiguous. Or, too verbose. Or, too indirect.
- 21. Thinking in Programming Language. Ifprogrammers think in programming languages, They must influence thoughts as much as natural languages do.
- 22. Theorem #2 "languages" in Theorem#1 includes programming languages.
- 23. Why don’t youchoose a good language? Programming langugages are so easy to learn.
- 24. What is agood language? The language that helps thinking
- 25. Recursion BASIC did notallow recursion
- 26. Factorial def fact(n) if n== 0 1 else n * fact(n - 1) end end print "6!=", fact(6), "n" 6!=740
- 27. A good Language doesnot restrict our thought
- 28. Factorial Again print "200!=",fact(200), "n" 200!=78865786736479050355236321393218506 2295135977687173263294742533244359449963 4033429203042840119846239041772121389196 3883025764279024263710506192662495282993 1113462857270763317237396988943922445621 4516642402540332918641312274282948532775 2424240757390324032125740557956866022603 1904170324062351700858796178922222789623 7038973747200000000000000000000000000000 00000000000000000000
- 29. Less Restriction print "200!=",fact(200), "n" 200!=788657867364790503552363213932185062295 13597768717326329474253324435944996340334292 03042840119846239041772121389196388302576427 90242637105061926624952829931113462857270763 31723739698894392244562145166424025403329186 41312274282948532775242424075739032403212574 05579568660226031904170324062351700858796178 92222278962370389737472000000000000000000000 0000000000000000000000000000 Ruby
- 30.
- 31. Succinctness is Power byPaul Graham Fred Brooks’ Law Less Lines ≒ Effective
- 32. Succinctness is Power LessCode, Less Bugs Less Bugs, You Feel Yourself Smarter. You can be 10 times (or even 1000 times) more productive
- 33. More Factorial class Factorial{ private static int fact(int n) { if (n == 1) return 1; return n * fact(n - 1); } public static void main(String[] argv) { System.out.println("6!="+fact(6)); } } 6!=740
- 34. Succinctness Example def fact(n) ifn == 1 1 else n * fact(n - 1) end end print "6!=", fact(6), "n" 6!=740 Ruby
- 35.
- 36. Functional Factorial def fact(n) (1..n).inject(:*) end print"6!=", fact(6), "n" 6!=740
- 37. A good language makesbetter programming experience
- 38.
- 39. Learnability How easy isit for users to accomplish basic tasks the first time they encounter the design?
- 40. Learnability Usability for Beginners Importantto Acquire New Users "Common Sense" is the Key
- 41. Efficiency Once users havelearned the design, how quickly can they perform tasks?
- 42. Efficiency More important thanlearnability Efficiency is the top purpose of languages
- 43. Memorability When users returnto the design after a period of not using it, how easily can they reestablish proficiency?
- 44.
- 45. Errors How many errorsdo users make, how severe are these errors, and how easily can they recover from these errors?
- 46. Errors When you seerepeated errors, you have to do something. Errors are the source of design inspiration.
- 47. Satisfaction How pleasant isit to use the design?
- 48. Satisfaction We program tohave fun. Even when we program for money, we want to have fun as well.
- 49.
- 50.
- 51. Learnability Ruby is veryconservative except for a few places Quick to learn Quick to try
- 52. Learnability Example Hello World! print"Hello Worldn" Hello World
- 53.
- 54. Efficiency No Run-Time Efficiency Rubyfocuses on the cost of programming.
- 55. Devlopment Efficiency Ruby focuseson the cost of programming by Simplicity Consistency Smartness
- 56. Simplicity Do you likeprogramming language to be simple? Probably you do.
- 57. Simplicity Does language simplicityreally help you? not always. need more complex tool sometimes
- 58. Need More ComplexTool Knife vs Chain Saw Bicycle vs Airplane
- 59. Human Heart: NoSimple We love simplicity We love complexity We love easy problems We hate easy problems
- 60. Pseudo-Simplicity Ruby is NOTa simple language.
- 61. Simplicity Example Rakefile Rake =Ruby Make task :default => [:test] task :test do ruby "test/unittest.rb" end
- 62. Simplicity Example In SimplerSyntax task({:default => [:test]}) task(:test, lambda(){ ruby "test/unittest.rb" })
- 63. Solution-Simplicity Tool Complexity isOK if it makes the Solution Simple
- 64. Efficiency Example /bin/cat inRuby puts ARGF It would be more than 50 lines of code in C
- 65.
- 66. Memorability Conservativeness helps heretoo Easy-to-remember syntax Ruby looks like other languages
- 67. Memorability Example Can youwrite /bin/cat -n without looking anything? I can, if I use Ruby. ARGF.each_with_index{|line,i| printf "%4d %s",i,line }
- 68.
- 69. Errors You will seeless errors due to Consistent Syntax Rules Succinct Code Less code, Less bug.
- 70.
- 71. Satisfaction As a result,Ruby is fun to use. It makes you feel smarter.
- 72.
- 73. Ruby is Goodfor Text Processing Web Programming XML Programming GUI Applications
- 74. Ruby is Goodfor Bioinformatics eXtreme Programming "I love it. Conceptually it is really clean and sweet." -- Kent Beck
- 75. Why I createdRuby Just for Fun Tool for me myself Ideal tool for Everyday Task
- 76. How I createdRuby Combine Good Things from the Past Design Conservative Design a Tool I Want to Use To Have Fun
- 77. The History of theRuby Language
- 78.
- 79.
- 80. Goals Scripting a la Perl NiceClean Syntax With OO
- 81. Real Goal To Enjoy MakingLanguage Implementation Programming
- 82.
- 83. Process Deconstruct Perl Reorganize intoClass Library
- 84. Process Iterators from CLU Higher-orderFunctions using Blocks
- 85. Process Some Spice fromPython ..and other languages
- 86.
- 87. In 1997 Hired byNaCl Became Full-time OSS Developer
- 88.
- 89.
- 90. Ruby in early2000s Became a Language for Geeks
- 91. In 2004 Ruby onRails
- 92. Ruby on Rails WebApplication Framework Web development that doesn’t hurt
- 93. Ruby on Rails 10xProductive than Java 15 Minutes to code Blog
- 94. Enterprise Ruby Ruby startedto be used in the Enterprise Environment
- 95.
- 96. Enterprise Ruby Issues areMatters of Resource/Money We Put in.
- 97. Ruby’s Mindshare From JavaTo Ruby
- 98. What’s "Enterprise"? What MajorPlayers Recommend: Sun Microsystems Microsoft Apple Etc.
- 99. Why Ruby? Ruby isProductive Ruby is Motivating Ruby is Fun
- 100. A Message fromRuby Enjoy Programming!