A Lazy Sequence: An error monad in Clojure
This brief post shows a possible error handling monad and associated attempt-all form for Clojure. This was devised to improve the error handling in necessary evil. This assumes that you are familiar with the basics of Konrad Hinsen’s clojure.contrib.monads API and the basic use of macros and protocols in clojure. The reason I chose to use the monad library for this is that it makes creating exten
Product Reviews - Watch and Diamond Reviews Here!
The Importance of Product Reviews to the Consumers When it comes to specific products, certain brands are trusted and proven in providing the necessary requirements, but the market becomes crowded, and a high competition is rising from all sellers of different products. As a result, confusion is commonly experienced by the consumers since the availability of the products in the market is drastical
Introduction to Monads - Adam Smyczek , LinkedInTechTalks
We've moved! Check out our tech talk playlists on the official LinkedIn Engineering YouTube channel.
A Lazy Sequence: Ghosts in the machine
This is the second (and final) part of my examination of the State monad and its variations. If you are unfamiliar with the basic concepts surrounding the State monad, you may wish to read the first part before continuing. Backtracking State One of the features of the State monad worth looking at is how it implements a simple interpreter. Our current interpreter lets us write any sort of procedura
netswitch! | ãŸã¶ã‚“Rubyã§ã¯ 〜 Maybeモナドã«æ†§ã‚Œã¦ 〜
Posted by nanki Wed, 28 Oct 2009 05:25:00 GMT Haskellã«ã¯Maybeモナドã¨ã„ã†ã®ãŒã‚ã£ã¦ã€ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’ã‹ãªã‚Šé©å½“ãªæ„Ÿã˜ã«æ›¸ã‘ã¦ã¨ã¦ã‚‚便利ãã†ã€‚ 一方ã€å¤šãã®ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã§ã¯ã€ request.mobile && request.mobile.docomo? File.open('example.txt').read rescue nil # ã“ã‚Œã¯ã™ã“ã—æ¨ªç€ class Never instance_methods.each do |v| undef_method(v) unless %w(__id__ __send__).include?(v) end def method_missing(*args) self end def end nil end end class Maybe < Never def initialize
Route 477 - gemcutterã®ä½¿ã„æ–¹ã¾ã¨ã‚ (2009年秋)
â– [haskell] モナドã£ã¦çµå±€ãªã‚“ãªã® 社内勉強会ã§ãƒ¢ãƒŠãƒ‰ã«ã¤ã„ã¦ç™ºè¡¨ã—ã¾ã—ãŸã€‚分ã‹ã£ãŸæ°—ãŒã™ã‚‹ãŸã³ã«ã™ãã«æ‰‹ã‹ã‚‰ã™ã‚Šã¬ã‘ã¦ã—ã¾ã†ã€ãã‚ŒãŒãƒ¢ãƒŠãƒ‰â€¦ï¼ 追記： モナドãã®ã‚‚ã®ãŒä½•ãªã®ã‹ã¨ã‹è€ƒãˆãªã„ã»ã†ãŒã„ã„ã‚“ã˜ã‚ƒãªã„ã§ã™ã‹ãï¼ [Twitter / ã„ーãã‚‹ã¨ã¾ã¨ã‚ˆã‚Šå¼•ç”¨] ã¾ã•ã«ãã®é€šã‚Šã ã¨æ€ã„ã¾ã™(笑)。IOã®ä½¿ã„æ–¹ã€Maybeã®ä½¿ã„æ–¹ã€Stateã®ä½¿ã„æ–¹ãªã©ã‚’押ã•ãˆã¦ãŠã‘ã°ã€ ä¸ãŒã©ã†ãªã£ã¦ã‚‹ã‹ãªã‚“ã¦çŸ¥ã‚‰ãªãã¦ã‚‚大丈夫。 ã§ã‚‚ã€ãƒ¢ãƒŠãƒ‰ã®æŒã¤ã€Œãªã‚“ã‹ç§˜æŠ€ãŒã‚ã‚Šãã†ãªæ„Ÿã˜ã€ãŒã€ä¸ã‚’覗ã„ã¦ã¿ãŸãã•ã›ã‚‹ã‚“ã§ã™ã‚ˆã。 ã“ã®ã€ã©ã“ã¾ã§æŽ˜ã£ã¦ã‚‚自分ã®çŸ¥ã‚‰ãªã„ã“ã¨ãŒå‡ºã¦ãã‚‹æ„Ÿã˜ãŒHaskellã®é…力ãªã®ã‹ã‚‚。 Haskell ã®æœ¬å½“ã«ã™ã”ã„ã¨ã“ã‚ã¯ã€ã€Œãªãœãªã«ã€ã‚’å•ã„ã‹ã‘ã‚‹ã“ã¨ã§ã„ã¤ã¾ã§ã‚‚プãƒã‚°ãƒ©ãƒžãŒæˆé•·ã§ãã‚‹ã¨ã“ã‚ã«ã‚る。 [ãµãã¼ã£ãŸãƒ¼ / ikegami__より引用] 一å•ä¸€ç” Q. モ
Groovyã§Maybe Monadを書ã„ã¦ã¿ãŸã€‚ - uehaj's blog
「モナドãªã‚“ã¦é›£è§£ãªã‚‚ã®ã‚’å«ã‚“ã 言語ã¯æ¥å‹™ã§ä½¿ãˆãーï¼ï¼ã€ã¨Scalaã®æ‚ªå£ã‚’言ãŠã†ã¨ã—ã¦èª¿ã¹ã¦ãŸã‚‰ãƒ¢ãƒŠãƒ‰ãŒä½•ã¨ãªã分ã‹ã£ãŸæ°—ãŒã—ãŸã®ã§Maybe Monadã‚’groovyã§æ›¸ã„ã¦ã¿ã¾ã—ãŸã€‚é¢ç™½ã„ã‚ã“ã‚Œã¯w。 ãŸã ã€Haskellã‚‚Scalaã‚‚ã¡ã‚‡ã£ã¨èªã‚“ã ãらã„ã®çµŒé¨“ã—ã‹ãªã„ã—ã€ã€ŒJavascriptã§Maybeã€ã¨ã‹ã€ŒRubyã§Maybeã€ã¨ã‹Perlã§ã¨ã‹ã‚‚å‚考ã«ã—ã¦ã¾ã›ã‚“ã®ã§ã€é–“é•ã£ã¦ã‚‹å¯èƒ½æ€§ã‚‚大*1。 例ã¨ã—ã¦ã¯ã€Œãƒ¢ãƒŠãƒ‰ã®å…¨ã¦ã€ã®ã‚¯ãƒãƒ¼ãƒ³ç¾Šã®è©±ã‚’実行ã—ã¦ã„ã¾ã™ã€‚ ãªãŠã€Maybeモナドã¯ãƒ¢ãƒŠãƒ‰ã®ä¸ã§ã‚‚ç°¡å˜ãªã‚‚ã®ã ãã†ãªã®ã§ã€ã‚ã‹ã£ãŸã¨ã„ã†ã®ã¯ãŠã“ãŒã¾ã—ã„，ã£ã¦ã®ã¯ãã®é€šã‚Šã§ã™ã€‚ ã•ã‚‰ã«ã€Monadã¯ã€ç´”関数型言語ã§ä½¿ã£ã¦æœ€ã‚‚効果を発æ®ã™ã‚‹ã‚‚ã®ã ã—ã€ãƒ©ã‚¤ãƒ–ラリや言語仕様やイディオムをå«ã‚€ã€ç·ä½“çš„ãªã€Œãƒ¢ãƒŠãƒ‡ã‚£ãƒƒã‚¯ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°æ–‡åŒ–ã€ã¨ã—ã¦ã§ã‚‚多分æ‰ãˆã‚‹ã¹ããªã®ã§ã€ï¼‘個Maybeを定義
1
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
{{#tags}}- {{label}}
{{/tags}}