2. Write a program that prints the numbers from 1 to 100. But for
multiples of three print “Fizz” instead of the number and for the
multiples of five print “Buzz”. For numbers which are multiples of
both three and five print “FizzBuzz”.
1 100
3 Fizz 5
Buzz 3 5 FizzBuzz
http://tickletux.wordpress.com/2007/01/24/using-fizzbuzz-to-find-developers-who-grok-coding/
http://www.aoky.net/articles/jeff_atwood/why_cant_programmers_program.htm

3. http://www.cs.is.saga-u.ac.jp/~nakayama07/sotsuken.html

5. Map
Last Recently Used (LRU) Cache
Map

6. #
lru.put(“a”, “dataA”);
lru.put(“b”, “dataB”);
lru.put(“c”, “dataC”);
lru.get(“a”); #=> null
# get
lru.put(“a”, “dataA”);
lru.put(“b”, “dataB”);
lru.get(“a”); #=> “dataA”
lru.put(“c”, “dataC”);
lru.get(“b”); #=> null

7. LRU Cache ?
( …)

8. LRU Cache ?
( …)

9. LRU Cache
( …)

11. s = FileStore.new
s.set(“foo”, “hoge”)
s.get(“foo”) #=> “hoge”
s.dump #=> “foo:hoge¥n”
s.set(“bar”, “fuga”)
s.dump #=> “foo:hoge¥nbar:fuga¥n”
s.get(“toto”) #=> nil
s.set(nil, “momo”) # nil
s.set(“”, “gogo”) #
s.dump #=> “foo:hoge¥nbar:fuga¥n”
s.set(“foo”, “piyo”)
s.dump #=> “bar:fuga¥nfoo:piyo¥n”

12. FileStore ?
( …)
void : set_multi(Map)
Map : get_multi(Array)
s.set_multi({‘foo’ => ‘hoge’, ‘bar’ => ‘fuga’})
s.get_multi([‘foo’, ‘bar’, ‘baz’]) #=> {‘foo’ => ‘hoge’, ‘bar’ => ‘fuga’}

13. FileStore ?
( …)
s.set(“foo”, “${now}”) #=> ${now}
s.get(“foo”) #=> “2010-07-10 14:19:12”

14. FileStore
( …)
set(key, val, second) ( )
set(key, val, Time) ( )

15. # 1
s.set_multi({‘foo’ => ‘hoge’, ‘bar’ => ‘fuga’})
s.get_multi([‘foo’, ‘bar’, ‘baz’]) #=> {‘foo’ => ‘hoge’, ‘bar’ => ‘fuga’}
# 2
s.set(“foo”, “${now}”) #=> ${now}
s.get(“foo”) #=> “2010-07-10 14:19:12” #=> dump ?
# 3
set(key, val, second=nil) ( )
set(key, val, Time=nil) ( )

16. FileStore
( …)

20. #
“ : ”
filter = WordFilter.new(‘Arsenal’)
# detect #=> true/false
filter.detect(“t_wada: Arsenal vs Chelsea !”) #=> true;
filter.detect(“t_wada: ManU vs Liverpool ”) #=> false;
# censor #=> String
filter.censor(“t_wada: Arsenal vs Chelsea !”)
#=> “t_wada: <censored> vs Chelsea !”

21. WordFilter ?
( …)
NG

22. WordFilter ?
…
( …)
<censored>
…

23. WordFilter ?
…
( …)
<censored>
…

24. WordFilter ?
( …)
( )

25. WordFilter
( …)

26. #1 NG
filter = WordFilter.new(‘Arsenal’, ‘t_wada’)
#2 ( OK)
filter.censor(“t_wada: Arsenal!!”) #=> “t_wada: <XXX>!!”;
#3
filter.censor(“t_wada: t_wada ”)
#=> “t_wada: <censored> ”;
#4
: < (OS OK)>
: < (OS OK)>