# fj.lang.rubyããŸã ã§ããŠããªããµã€ãããããããªã®ã§fj.lang.misc
# ã«ãã¯ãã¹ãã¹ãããŠãããŸãã
ãã®èšäºã¯ãªããžã§ã¯ãæåã¹ã¯ãªããèšèªRubyã«é¢ããŠããããã
質åã«å¯ŸããåçããŸãšãããã®ã§ãã
ãã®FAQã¯ä»¥äžã®ç« ã«ããæ§æãããŠããŸãã
1. äžè¬çãªæ
å ±
2. Rubyããã°ã©ãã³ã°
ç« ã®é ãæ¢ãã«ã¯"^1. "ãªã©ã®æ£èŠè¡šçŸã䜿ã£ãŠæ€çŽ¢ããŠãã ããã
åç« ã«ã¯ä»¥äžã®è³ªåãåããããŠããŸãã
1. äžè¬çãªæ
å ±
1.1. Q. Rubyãšã¯äœã§ãã?
1.2. Q. ãªãRubyãšããååãªã®ã§ãã?
1.3. Q. Rubyã®ãœãŒã¹ã³ãŒãã¯ã©ãã§æã«å
¥ããŸãã?
1.4. Q. Rubyã®ãã€ããªããã±ãŒãžã¯ã©ãã§æã«å
¥ããŸãã?
1.5. Q. Rubyã®ããã¥ã¡ã³ãã¯ã©ãã§æã«å
¥ããŸãã?
1.6. Q. Rubyããã±ãŒãžãæã«å
¥ããã©ãŒãµã€ãã¯ãããŸãã?
1.7. Q. Rubyã®ã¡ãŒãªã³ã°ãªã¹ãããã¥ãŒã¹ã°ã«ãŒãã¯ãããŸãã?
1.8. Q. Rubyã®ããŒã ããŒãžã¯ãããŸãã?
1.9. Q. WWWã§Rubyã®ããã¥ã¡ã³ããåç
§ã§ããŸãã?
1.10. Q. Rubyã解説ããæžç±ã¯åºçãããŠããŸãã?
2. Rubyããã°ã©ãã³ã°
2.1. Q. selfãšã¯äœã§ãã?
2.2. Q. ãã©ã€ããŒãã¡ãœãããšã¯äœã§ãã?
2.3. Q. ã€ã³ã¹ã¿ã³ã¹å€æ°ãšã¯äœã§ãã?
2.4. Q. ã€ã³ã¹ã¿ã³ã¹å€æ°ãåç
§ããã«ã¯ã©ãããã°ããã§ãã?
2.5. Q. ã¢ãžã¥ãŒã«ãšã¯äœã§ãã?
2.6. Q. ã¢ãžã¥ãŒã«é¢æ°ãšã¯äœã§ãã?
2.7. Q. subãšsub!ã¯ã©ãéãã®ã§ãã?
2.8. Q. å€é代å
¥ãšã¯äœã§ãã?
2.9. Q. åŒæ°ãžã®ä»£å
¥ããããšã©ããªããŸãã?
2.10. Q. åŒæ°ã«ã¡ãã»ãŒãžãéããšã©ããªããŸãã?
2.11. Q. åŒæ°ã®ããã©ã«ãå€ãæå®ã§ããŸãã?
2.12. Q. å¯å€é·åŒæ°ã¯ãããŸãã?
2.13. Q. ããŒã«ã«å€æ°ã¯åæåããªããšãããªãã®ã§ãã?
2.14. Q. ã€ãã¬ãŒã¿ãšã¯äœã§ãã?
2.15. Q. 颿°ãã€ã³ã¿ã¯ãããŸãã?
2.16. Q. i++ã¯ãããŸãã?
2.17. Q. ãªããžã§ã¯ãã®ã¯ã©ã¹ãç¥ãã«ã¯ã©ãããã°ããã§ãã?
2.18. Q. ç¹ç°ã¡ãœãããšã¯äœã§ãã?
2.19. Q. ã¯ã©ã¹ã¡ãœããã¯ãããŸãã?
2.20. Q. ã¯ã©ã¹å€æ°ã¯ãããŸãã?
2.21. Q. print (1+2)*3 ããšã©ãŒã«ãªãã®ã¯ãªãã§ãã?
2.22. Q. loadãšrequireã¯ã©ãéãã®ã§ãã?
2.23. Q. ãããã¬ã¯ãããŸãã?
å質åãæ¢ãã«ã¯"^1.1. "ãªã©ã®æ£èŠè¡šçŸã䜿ã£ãŠæ€çŽ¢ããŠãã ããã
1. äžè¬çãªæ
å ±
===============
1.1. Q. Rubyãšã¯äœã§ãã?
A. Rubyã¯ãŸã€ããšããã²ãæ°ã«ãã£ãŠèšèšãããã·ã³ãã«ãã€åŒ·åãªãªã
ãžã§ã¯ãæåã¹ã¯ãªããèšèªã§ããå€ãã®ä»ã®ã¹ã¯ãªããèšèªãšéã£ãŠRuby
ã¯æåãããªããžã§ã¯ãæåèšèªãšããŠèšèšãããŠããŸããRubyã¯åçåä»
ããäŸå€åŠçãã€ãã¬ãŒã¿ãã¯ããŒãžã£ãç¹ç°ã¡ãœãããã¬ãŒããŒãžã³ã¬ã¯
ã·ã§ã³ã匷åãªããã¹ãåŠçæ©èœãªã©ã®ç¹é·ãåããŠãããæè»œã«ãªããžã§
ã¯ãæåããã°ã©ãã³ã°ãããããšãã§ããŸãã
1.2. Q. ãªãRubyãšããååãªã®ã§ãã?
A. Rubyãšããååã¯Perlã«ç±æ¥ããŠããŸããperlãšããèªãã飿³ããã
åèªã«pearl(çç )ããããŸããpearlã¯6æã®èªçç³ã§ããäžæ¹ãrubyã¯7æ
ã®èªçç³ã§ããã€ãŸãRubyãšããååã«ã¯ãPerlã®æ¬¡ã®èšèªããšããæå³ã
蟌ããããŠããã®ã§ãããŸããåæããRubyã®éçºã«é¢ãã£ãŠããææ°(Ruby
ãšããååã®ææ¡è
)ã®èªçæ¥ã7æã ã£ãããã ãšãã説ããããŸãã
1.3. Q. Rubyã®ãœãŒã¹ã³ãŒãã¯ã©ãã§æã«å ¥ããŸãã?
A. ftp://ftp.netlab.co.jp/pub/lang/ruby/ã§Rubyã®ææ°ã®ãœãŒã¹ã³ãŒãã
æã«å
¥ããŸãããŸããftp://ftp.netlab.co.jp/pub/lang/ruby/beta/ã§ããŒ
ã¿ããŒãžã§ã³ãæã«å
¥ããŸãã
1.4. Q. Rubyã®ãã€ããªããã±ãŒãžã¯ã©ãã§æã«å ¥ããŸãã?
A. djgppçãšcygnusçã®ãã€ããªããã±ãŒãžãftp://ftp.netlab.co.jp/pub/
lang/ruby/pc/ã§æã«å
¥ããŸãããŸãRedHat/Linuxçšã®ããã±ãŒãžãftp://
ftp.netlab.co.jp/pub/lang/ruby/contribã§æã«å
¥ããŸããDebian/Linuxçš
ã®ããã±ãŒãžã¯Debianã®ãµã€ãã§æã«å
¥ããŸãã
1.5. Q. Rubyã®ããã¥ã¡ã³ãã¯ã©ãã§æã«å ¥ããŸãã?
A. ftp://ftp.netlab.co.jp/pub/lang/ruby/doc/ã§æã«å ¥ããŸãã
1.6. Q. Rubyããã±ãŒãžãæã«å ¥ããã©ãŒãµã€ãã¯ãããŸãã?
以äžã®ãã©ãŒãµã€ãããããŸãã
1.7. Q. Rubyã®ã¡ãŒãªã³ã°ãªã¹ãããã¥ãŒã¹ã°ã«ãŒãã¯ãããŸãã?
A. Rubyã®ã¡ãŒãªã³ã°ãªã¹ãã¯ruby...@netlab.co.jpã§ããåå ãã人ã¯
ruby...@netlab.co.jpã«ã¡ãŒã«ãéããšèªåç»é²ãããŸãããŸããRuby
ã®éçºã«é¢ããã¡ãŒãªã³ã°ãªã¹ããããããã¡ãã¯ruby...@netlab.co.jp
ã§ããåå æ¹æ³ã¯åãã§ããã¡ãŒãªã³ã°ãªã¹ããè±äŒãããå Žåã¯*æ¬æã®*
å
é ã«#byeãšæžããã¡ãŒã«ãã¡ãŒãªã³ã°ãªã¹ãã«éã£ãŠãã ããã
ããããã¥ãŒã¹ã§ã¯fj.lang.rubyã§Rubyã«é¢ããè°è«ãè¡ãããŠããŸãã
1.8. Q. Rubyã®ããŒã ããŒãžã¯ãããŸãã?
A. Rubyã®å
¬åŒããŒã ããŒãžã¯http://www.netlab.co.jp/ruby/ã§ããæ¥æ¬
èªã®ããŒãžã¯http://www.netlab.co.jp/ruby/jpã«ãªã£ãŠããŸãã
1.9. Q. WWWã§Rubyã®ããã¥ã¡ã³ããåç §ã§ããŸãã?
A. äžèšã®å ¬åŒããŒã ããŒãžã§ããã¥ã¡ã³ããåç §ã§ããŸãã
1.10. Q. Rubyã解説ããæžç±ã¯åºçãããŠããŸãã?
A. æ®å¿µãªããä»ã®ãšããRubyã解説ããæžç±ã¯åºçãããŠããŸãããçŸåšã
ãŸã€ããšããã²ãæ°ãšç³å¡åæš¹æ°ã«ããRubyã®è§£èª¬æžãå·çãããŠããã
1998幎å€é åºçãããäºå®ã§ãã
2. Rubyããã°ã©ãã³ã°
=====================
2.1. Q. selfãšã¯äœã§ãã?
A. selfã¯ã¡ãœããã®å®è¡äž»äœã衚ããŸãããªããžã§ã¯ããèªåèªèº«ã«ã¡ã
ã»ãŒãžãéä¿¡ããå Žåã«çšããããŸããã¡ãœããåŒã³åºãã§ã¬ã·ãŒããçç¥
ãããå Žåã¯selfã®ã¡ãœãããåŒã³åºãããŸãã
2.2. Q. ãã©ã€ããŒãã¡ãœãããšã¯äœã§ãã?
A. ã¬ã·ãŒããçç¥ãã圢ã§ããåŒã³åºããªãã¡ãœããããã©ã€ããŒãã¡ãœ
ãããšåŒã³ãŸãã
print("foo\n") #=> foo
self.print("foo\n") #=> NameError: private method `print' called for main
2.3. Q. ã€ã³ã¹ã¿ã³ã¹å€æ°ãšã¯äœã§ãã?
A. ã€ã³ã¹ã¿ã³ã¹å€æ°ãšã¯ã€ã³ã¹ã¿ã³ã¹æ¯ã«å¥ã
ã®å€ãä¿æããã倿°ã§ãã
ã€ã³ã¹ã¿ã³ã¹å€æ°ã«ã¯@ãä»ããŸãã
2.4. Q. ã€ã³ã¹ã¿ã³ã¹å€æ°ãåç §ããã«ã¯ã©ãããã°ããã§ãã?
A. ã€ã³ã¹ã¿ã³ã¹å€æ°ã¯ãã®ã¯ã©ã¹ã®ã¡ãœããã®äžã§ããåç
§ã§ããŸããã
å€ããã€ã³ã¹ã¿ã³ã¹å€æ°ãåç
§ããã«ã¯ã¢ã¯ã»ã¹ã¡ãœãããçšæããŸãã
attrã䜿ãããšã§ç°¡åã«ã¢ã¯ã»ã¹ã¡ãœãããå®çŸ©ããããšãã§ããŸãã
class Person
attr :name
def initialize(name)
@name = name
end
end
tom = Person.new("Tom")
print tom.name, "\n" #=> Tom
2.5. Q. ã¢ãžã¥ãŒã«ãšã¯äœã§ãã?
A. Rubyã¯åäžç¶æ¿ã§ãããã¢ãžã¥ãŒã«ãå°å
¥ããããšã§å€éç¶æ¿ãšåçã®
æ©èœãå®çŸããŠããŸããã¢ãžã¥ãŒã«ã¯ä»ã®ã¯ã©ã¹ã«æ©èœãæäŸããã ãã§ã
èªåèªèº«ã¯ã€ã³ã¹ã¿ã³ã¹ãçæããªãç¹æ®ãªã¯ã©ã¹ã§ããã¯ã©ã¹ã¯ã¢ãžã¥ãŒ
ã«ãã€ã³ã¯ã«ãŒãããããšã§ãã®ã¢ãžã¥ãŒã«ã®æ©èœãç¶æ¿ããããšãã§ããŸ
ãã
module Runnable
def run
print "running...\n"
end
end
class Runner < Person
include Runnable
end
2.6. Q. ã¢ãžã¥ãŒã«é¢æ°ãšã¯äœã§ãã?
A. ã¢ãžã¥ãŒã«é¢æ°ã¯ã¢ãžã¥ãŒã«ã®ã¡ãœãããšããŠãç¹ç°ã¡ãœãããšããŠã
å®çŸ©ãããŠããã¡ãœããã®ããšã§ããã¢ãžã¥ãŒã«é¢æ°ã¯ã
Math.sqrt(2)
ãšãã圢åŒãš
include Math
sqrt(2)
ãšãã圢åŒã®äž¡æ¹ãçšããããšãã§ããŸãã
2.7. Q. subãšsub!ã¯ã©ãéãã®ã§ãã?
A. subã¯å€æŽããããªããžã§ã¯ããè¿ãã ãã§ã¬ã·ãŒãèªèº«ã«ã¯å€åããªã
ã®ã«å¯ŸããŠãsub!ã¯ã¬ã·ãŒãèªèº«ã倿ŽããŸããsub!ã®ããã«ã¬ã·ãŒãã®ç¶
æ
ãå€åãããã¡ãœããã¯ç Žå£çãªã¡ãœãããšåŒã°ããŸããç Žå£çãªã¡ãœã
ãã«ã¯!ãä»ããããããšãå€ãã§ããã!ãä»ããŠããªãç Žå£çã¡ãœããã
ãããŸããç Žå£çãªã¡ãœãããäžçšæã«äœ¿ããšæãã¬å¯äœçšãèµ·ããå Žåã
ããã®ã§æ³šæãå¿
èŠã§ãã
2.8. Q. å€éä»£å ¥ãšã¯äœã§ãã?
A. å€éä»£å ¥ã¯è€æ°ã®åŒãŸãã¯é åããåæã«ä»£å ¥ãè¡ããŸãã
a, b = 1, 2 # ããã㯠a, b = [1, 2]
p a #=> 1
p b #=> 2
2.9. Q. åŒæ°ãžã®ä»£å ¥ããããšã©ããªããŸãã?
A. åŒæ°ãžã®ä»£å ¥ãè¡ã£ãŠãã¡ãœããã®åŒã³åºãåŽã«ã¯åœ±é¿ã¯ãããŸããã
def swap(a, b)
a, b = b, a
end
a = 1; b = 2
swap(a, b)
p a #=> 1
p b #=> 2
2.10. Q. åŒæ°ã«ã¡ãã»ãŒãžãéããšã©ããªããŸãã?
A. åŒæ°ãåç
§ãããªããžã§ã¯ãã¯åŒã³åºãåŽã®ãªããžã§ã¯ããšåããªããž
ã§ã¯ããªã®ã§ãã¡ãã»ãŒãžãéãããšã§ãªããžã§ã¯ãã®ç¶æ
ã倿Žããã
å Žåã¯åŒã³åºãåŽã«ã圱é¿ããããŸãã
def strupcase(str)
str.upcase!
end
s = "foo"
strupcase(s)
p s #=> "FOO"
2.11. Q. åŒæ°ã®ããã©ã«ãå€ãæå®ã§ããŸãã?
A. ã¯ããåŒæ°ã®ããã©ã«ãå€ã«ã¯ä»»æã®åŒãæå®ã§ããŸããè©äŸ¡ã¯ã¡ãœã
ãã®ã¹ã³ãŒãã§åŒã³åºãæã«è¡ãããŸãã
def hello(msg = "Hello World!")
print msg, "\n"
end
hello #=> Hello World!
hello("Hello World from Ruby!") #=> Hello World from Ruby!
2.12. Q. å¯å€é·åŒæ°ã¯ãããŸãã?
A. ã¯ããå¯å€é·åŒæ°ã¯*ãåŒæ°ã«ä»ããŠé
åã§åãåãããšãã§ããŸããé
ã«ã¡ãœããåŒã³åºãã®æã«åŒæ°ã«*ãä»ãããšé
åãå±éããŠã¡ãœããã«æž¡
ããŸãã
def printf(fmt, *args)
print format(fmt, *args)
end
2.13. Q. ããŒã«ã«å€æ°ã¯åæåããªããšãããªãã®ã§ãã?
A. ã¯ããåæåãããŠããªãããŒã«ã«å€æ°ãåç §ãããšãšã©ãŒã«ãªããŸãã
2.14. Q. ã€ãã¬ãŒã¿ãšã¯äœã§ãã?
A. ã€ãã¬ãŒã¿ãšã¯åŒã³åºãæã«ã€ãã¬ãŒã¿ãããã¯ãšããã³ãŒããããã¯
ãæž¡ãããã¡ãœããã®ããšã§ããã€ãã¬ãŒã¿ãããã¯ã¯ã€ãã¬ãŒã¿å
ã§ã
yieldã®åŒã³åºãæã«å®è¡ãããŸããã€ãã¬ãŒã¿ãããã¯ã¯å¿åã®ã³ãŒã«ã
ãã¯é¢æ°ã®ãããªåããããŸãã
ary = ["foo", "bar", "baz"]
ary.each do |i|
print i, "\n"
end
2.15. Q. 颿°ãã€ã³ã¿ã¯ãããŸãã?
A. 颿°ãã€ã³ã¿ã¯ãããŸããã代ãã«ã€ãã¬ãŒã¿ãå©çšããŠãã ããã
Procãªããžã§ã¯ãã䜿ãã°ã€ãã¬ãŒã¿ãããã¯ããªããžã§ã¯ãåããããš
ãã§ããŸãã
p = proc {|msg| print msg, "\n" }
p.call("foo") #=> foo
2.16. Q. i++ã¯ãããŸãã?
A. ãããŸãããi+=1ãå©çšããŠãã ããã
2.17. Q. ãªããžã§ã¯ãã®ã¯ã©ã¹ãç¥ãã«ã¯ã©ãããã°ããã§ãã?
A. typeã¡ãœããã§ãã®ãªããžã§ã¯ãã®ã¯ã©ã¹ãåŸãããšãã§ããŸãã
p "foo".type #=> String
2.18. Q. ç¹ç°ã¡ãœãããšã¯äœã§ãã?
A. ç¹ç°ã¡ãœãããšã¯ã¯ã©ã¹ã§ã¯ãªãç¹å®ã®ã€ã³ã¹ã¿ã³ã¹ã«ã®ã¿å®çŸ©ããã
ã¡ãœããã§ããç¹ç°ã¡ãœãããçšããããšã§ããµãã¯ã©ã¹åãããªããŠããª
ããžã§ã¯ãã«ã¡ãœããã远å ããããåå®çŸ©ããããšãã§ããŸãã
msg = "Hello"
def msg.print
$>.print self, "\n"
end
msg.print #=> Hello
2.19. Q. ã¯ã©ã¹ã¡ãœããã¯ãããŸãã?
A. ã¯ã©ã¹ã¡ãœãããšåŒã°ããã¡ãœããã«ã¯äºçš®é¡ãããŸããäžã€ã¯Class
ãšããã¯ã©ã¹ã§å®çŸ©ãããã¡ãœããã§ãããã¹ãŠã®ã¯ã©ã¹ãªããžã§ã¯ãã¯
Classã®ã€ã³ã¹ã¿ã³ã¹ãªã®ã§Classã§å®çŸ©ãããã¡ãœãããåŒã³åºãããšã
ã§ããŸããããäžã€ã¯ã¯ã©ã¹ãªããžã§ã¯ãã«å¯ŸããŠå®çŸ©ãããç¹ç°ã¡ãœã
ãã§ããã¯ã©ã¹ã®ç¹ç°ã¡ãœããã¯ã¯ã©ã¹å®çŸ©ã®äžã§å®çŸ©ããŠãå€ã§å®çŸ©ã
ãŠãåãæå³ã«ãªããŸãã
2.20. Q. ã¯ã©ã¹å€æ°ã¯ãããŸãã?
A. ãããŸããã代ãã«ã¯ã©ã¹å®æ°ãšé åã䜿ããŸãã
class Foo
COUNT = [0]
def initialize
COUNT[0] += 1
end
def Foo.count
return COUNT[0]
end
end
2.21. Q. print (1+2)*3 ããšã©ãŒã«ãªãã®ã¯ãªãã§ãã?
A. (print(1+2)) * 3 ãšè§£éãããããã§ãããã®ãããªå Žåã¯print((1+2)*3)
ã®ããã«ããŠãã ããã
2.22. Q. loadãšrequireã¯ã©ãéãã®ã§ãã?
A. loadã¯Rubyã¹ã¯ãªããã®ã¿ããŒãããŸãããrequireã¯Cã§èšè¿°ãããæ¡
匵ã¢ãžã¥ãŒã«ãããŒãããŸããæ¢ã«ããŒããããŠããã©ã€ãã©ãªãrequire
ããå Žåã¯ããŒãããã«falseãè¿ããŸãã
2.23. Q. ãããã¬ã¯ãããŸãã?
A. ãããŸãã
ruby -r debug foo.rb
ãšããããšã§gdb颚ã®ãããã¬ãå©çšã§ããŸããsampleãã£ã¬ã¯ããªã«ã¯
Emacsçšã®ã€ã³ã¿ãŒãã§ã€ã¹ãæäŸãã rubydb.elãçšæãããŠããŸãã
sh...@po.aianet.ne.jp (Shugo Maeda) wrote:
|1.2. Q. ãªãRubyãšããååãªã®ã§ãã?
|
|A. Rubyãšããååã¯Perlã«ç±æ¥ããŠããŸããperlãšããèªãã飿³ããã
|åèªã«pearl(çç )ããããŸããpearlã¯6æã®èªçç³ã§ããäžæ¹ãrubyã¯7æ
|ã®èªçç³ã§ããã€ãŸãRubyãšããååã«ã¯ãPerlã®æ¬¡ã®èšèªããšããæå³ã
|蟌ããããŠããã®ã§ãããŸããåæããRubyã®éçºã«é¢ãã£ãŠããææ°(Ruby
|ãšããååã®ææ¡è
)ã®èªçæ¥ã7æã ã£ãããã ãšãã説ããããŸãã
ãUNIX çšèª ç±æ¥/èªã¿æ¹èŸæžããèŠããšperlã¯æåã¯"Practical
Extraction and Report Language"ã®andã®aãå«ããŠpearlã ã£ã
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sh...@po.aianet.ne.jp (Shugo Maeda) writes:
|åç°ã§ãã
|ãUNIX çšèª ç±æ¥/èªã¿æ¹èŸæžããèŠããšperlã¯æåã¯"Practical
| Extraction and Report Language"ã®andã®aãå«ããŠpearlã ã£ã
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http://cuiwww.unige.ch/cgi-bin/langlist ã«ãããš
1 Jones & Sheeran, 1986. Hardware description language. "Ruby - A Language of Relations and Higher-Order
Functions", M. Sheeran, Proc 3rd Banff Workshop on Hardware Verification, Springer 1990.
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Yukihiro Matsumoto <ma...@netlab.co.jp> wrote:
||ãUNIX çšèª ç±æ¥/èªã¿æ¹èŸæžããèŠããšperlã¯æåã¯"Practical
|| Extraction and Report Language"ã®andã®aãå«ããŠpearlã ã£ã
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|http://cuiwww.unige.ch/cgi-bin/langlist ã«ãããš
|
|1 Jones & Sheeran, 1986. Hardware description language. "Ruby - A Language of Relations and Higher-Order
|Functions", M. Sheeran, Proc 3rd Banff Workshop on Hardware Verification, Springer 1990.
|
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