[B! Scala] tom__boã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

tom__bo id:tom__bo

Scalaã«é–¢ã™ã‚‹tom__boã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (6)

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Scalaå…¥é–€è¨˜ - $shibayu36->blog;
åƒ•ã¯ã“ã‚Œã¾ã§ã¾ã¨ã‚‚ã«å¦ç¿’ã—ãŸãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžãŒPerlã¨JavaScriptã—ã‹ãªãã¦ã€é™çš„è¨€èªžçš„ãƒ‘ãƒ©ãƒ€ã‚¤ãƒ ã‚„é–¢æ•°åž‹ãƒ‘ãƒ©ãƒ€ã‚¤ãƒ ã¯æ¦‚å¿µã¯çŸ¥ã£ã¦ã„ã‚‹ã‚‚ã®ã®ã€ãã‚ŒãŒã©ã†å½¹ã«ç«‹ã¤ã®ã‹ã€é€†ã«ã©ã†ã„ã†é¢ã§èª²é¡ŒãŒã‚ã‚Šã©ã®ã‚ˆã†ã«å¯¾å‡¦ã•ã‚Œã¦ã„ã‚‹ã®ã‹ã€ãªã©ã¨ã„ã£ãŸã“ã¨ã‚’çŸ¥ã‚‰ãªã‹ã£ãŸã€‚çŸ¥ã‚‰ãªãã¦ã‚‚ã¾ã‚ä»•äº‹ã¯Perlã¨JSã§ã‚„ã£ã¦ã„ã‚‹ã®ã§å•é¡Œãªã„ã€‚ã—ã‹ã—ã™ã§ã«ã“ã‚Œã‚‰ã®è¨€èªžã‹ã‚‰å¾—ã‚‰ã‚Œã‚‹æ¦‚å¿µçš„ãªçŸ¥è˜ã®å¸åŽã®é€Ÿåº¦ãŒéˆåŒ–ã—ã¦ãã¦ã„ã¦ã€ã“ã®ã¾ã¾ã§ã¯ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã¨ã—ã¦ã¾ãšã„ã®ã§ã¯ãªã„ã‹ã¨ã„ã†å±æƒ§æ„ŸãŒã‚ã£ãŸã€‚ ãã“ã§é™çš„è¨€èªžã§ã‚ã‚Šã€é–¢æ•°åž‹è¨€èªžã§ã‚ã‚Šã€ã¾ãŸç¤¾å†…ã§ã‚‚ä½¿ã‚ã‚Œå§‹ã‚ã¦ã„ã‚‹ãŸã‚ã‚µãƒ³ãƒ—ãƒ«ã‚³ãƒ¼ãƒ‰ãŒã‚ã‚‹Scalaã®å¦ç¿’ã‚’ã™ã‚‹ã“ã¨ã«ã—ãŸã€‚ å¦ç¿’ã™ã‚‹ã«ã‚ãŸã£ã¦å›°ã£ãŸã“ã¨ã¯ã€ã©ã†ã„ã†ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆã‚’èªã¿ã€ã©ã®ã‚ˆã†ã«å®Ÿè·µã™ã‚‹ã¨Scalaã®æ¦‚è¦³ã‚’ã¤ã‹ã‚ã‚‹ã‹åˆ†ã‹ã‚‰ãªã„ã¨ã„ã†ã“ã¨ã ã£ãŸã€‚ãã“ã§ä»Šå›žã¯è‡ªåˆ†ã®çµŒé¨“ã‚’è¸ã¾ãˆã¦ã€ã“ã®ã‚ˆã†ã«å…¥é–€ã—ã¦ã„ãã¨
tom__bo 2015/11/09
scala
ãƒªãƒ³ã‚¯
bullet-scala: N+1ã‚¯ã‚¨ãƒªå•é¡Œã‚’å›žé¿ã™ã‚‹ - è²³ä½°ä¼æ‹¾é™¸å¤œæ—¥è¨˜
Scalaé–¢è¥¿ Summit 2015ã§ã®ç™ºè¡¨ã§è§¦ã‚Œã¦ã„ãŸN+1ã‚¯ã‚¨ãƒªå•é¡Œã‚’ãªã‚“ã¨ã‹ã™ã‚‹ãŸã‚ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’å…¬é–‹ã—ãŸ. ç™ºè¡¨ã¯ä»¥ä¸‹ã®ã‚‚ã®ã§, ã“ã“ã§ã¯ã€Œé–¢ä¿‚ãƒ¢ãƒŠãƒ‰ã€ã¨ã„ã†åå‰ã§ç´¹ä»‹ã—ã¦ã„ãŸã‘ã‚Œã©, ã“ã‚Œã¯å£é ã§ã‚‚èª¬æ˜Žã—ãŸã‚ˆã†ã«ä¾¿å®œä¸Šã¦ãã¨ãƒ¼ã«ã¤ã‘ãŸåå‰ã§ã‚ã£ã¦, ã¨ãã«ãã†ã„ã†åå‰ã®ã‚ˆãçŸ¥ã‚‰ã‚ŒãŸãƒ¢ãƒŠãƒ‰ãŒã‚ã‚‹ã¨ã„ã†ã‚ã‘ã§ã‚‚ãªã‘ã‚Œã°, ãã‚‚ãã‚‚ãƒ¢ãƒŠãƒ‰ã§ã‚ã‚‹ã‹ã©ã†ã‹ã¯ã‚ã¾ã‚Šæœ¬è³ªçš„ã§ã¯ãªã„. ã“ã®ç™ºè¡¨ã®ã‚ã¨ã«, Rails (Active Record)ã§ã®bulletã®ã‚ˆã†ã«N+1å•é¡Œã®æ¤œå‡ºã‚’Scalaã§ã‚„ã‚‹æ–¹æ³•ã¯ãªã„ã ã‚ã†ã‹, ã¨è¨€ã£ã¦ã„ã‚‹äººãŒã„ãŸã®ã§, ãã†ã„ã†ã‚‚ã®ã‚’æŽ¢ã—ã¦ã„ã¦è¾¿ã‚Šã¤ã‘ã‚‹ã¨ã‚ˆã‹ã‚ã†ã¨ã„ã†ã“ã¨ã§, bullet-scalaã¨ã„ã†åå‰ã«ã—ãŸ. ã‚‚ã¡ã‚ã‚“N+1å•é¡Œã®æ¤œå‡ºã®ãŸã‚ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã¨ã„ã†ã‚ã‘ã§ã¯ãªã„ã—, å‹•çš„ã«æ¤œå‡ºã™ã‚‹ã®ã§ã¯ãªãåŽŸç†çš„ã«å•é¡ŒãŒç™ºç”Ÿã—ãªã„ã‚ˆã†ã«ã™ã‚‹ã‚‚ã®ãªã®ã§, æ€
tom__bo 2015/08/20
scala
ãƒªãƒ³ã‚¯
Mackerelã§æŽ¡ç”¨ã—ã¦ã„ã‚‹æŠ€è¡“ä¸€è¦§ã¨ãã®ç´¹ä»‹ - Hatena Developer Blog
ã“ã‚“ã«ã¡ã¯ã€‚Songmuã§ã™ã€‚ ã“ã®è¨˜äº‹ã¯ã¯ã¦ãª ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã‚¢ãƒ‰ãƒ™ãƒ³ãƒˆã‚«ãƒ¬ãƒ³ãƒ€ãƒ¼ã®3æ—¥ç›®ã§ã™ã€‚ æ˜¨æ—¥ã€Hatena Engineer Seminar #3ã‚’é–‹å‚¬ã„ãŸã—ã¾ã—ãŸã€‚ä½•ã‚ˆã‚Šå‚åŠ çŽ‡ãŒé«˜ã‹ã£ãŸã“ã¨ã«æ„Ÿæ¿€ã—ãŸã®ã§ã™ãŒã€ãã®åˆ†å°‘ã—çª®å±ˆãªæ€ã„ã‚’ã•ã›ã¦ã—ã¾ã£ãŸã‹ã‚‚ã—ã‚Œãªã„ã®ã¯ç”³ã—è¨³ãªã‹ã£ãŸã§ã™ã€‚å¤šæ•°ã®ã”å‚åŠ æœ¬å½“ã«ã‚ã‚ŠãŒã¨ã†ã”ã–ã„ã¾ã—ãŸã€‚ ã‚»ãƒŸãƒŠãƒ¼ã§ã¯Mackerel overviewã¨ã„ã†è©±ã‚’ã•ã›ã¦ã‚‚ã‚‰ã£ãŸã®ã§ã™ãŒã€ãã“ã§ãŠè©±ã—ãŸMackerelã§æŽ¡ç”¨ã—ã¦ã„ã‚‹æŠ€è¡“ã«ã¤ã„ã¦èª¬æ˜Žã—ã¾ã™ã€‚ Mackerelã¨ã¯ï¼Ÿ ä»Šå¹´ã®9æœˆ17æ—¥ã«ãƒªãƒªãƒ¼ã‚¹ã—ãŸã¯ã¦ãªè¬¹è£½ã®ã‚µãƒ¼ãƒãƒ¼ç®¡ç†ãƒ»ç›£è¦–ãƒ„ãƒ¼ãƒ«ã§ã™ã€‚ æ•°å¤šãã®ã‚µãƒ¼ãƒãƒ¼ã‚’é‹ç”¨ã—ã¦ã„ã‚‹ã¯ã¦ãªã¯ã€ã“ã‚Œã¾ã§ã‚µãƒ¼ãƒãƒ¼ç®¡ç†ãƒ„ãƒ¼ãƒ«ã‚’å†…è£½ã—ã¦ããŸã®ã§ã™ãŒã€ãã®ãƒŽã‚¦ãƒã‚¦ã‚’æ´»ã‹ã—ã€ã‚µãƒ¼ãƒ“ã‚¹ç”¨ã«æ–°ãŸã«ä¸€ã‹ã‚‰ä½œã£ãŸã‚µãƒ¼ãƒ“ã‚¹ã«ãªã‚Šã¾ã™ã€‚ ã¾ãŸã€ã¯ã¦ãªã®æ—¢å˜ã‚µãƒ¼ãƒ“ã‚¹ã¨ã¯æ€§è³ªãŒç•°ãªã‚‹ãŸã‚ã€æŠ€è¡“é¸
tom__bo 2015/08/09
mackerel

scala

graphite

postgresql
ãƒªãƒ³ã‚¯
ã¯ã¦ãªãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ in Scala
2. è‡ªå·±ç´¹ä»‹ åå‰ ã„ ãª ä¼Šå¥ˆ ã‚Šã‚“ãŸã‚ã† æž—å¤ªéƒŽâ€ƒ (id:tarao @oarat) 2008-08 ã¯ã¦ãªã‚¤ãƒ³ã‚¿ãƒ¼ãƒ³ 2008-10 ã¯ã¦ãªã‚¢ãƒ«ãƒã‚¤ãƒˆ (ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ãƒãƒ¼ãƒ ) 2010-04 æ—¥æœ¬å¦è¡“æŒ¯èˆˆä¼š ç‰¹åˆ¥ç ”ç©¶å“¡ (DC1) 2013-04 ã¯ã¦ãªæ£ç¤¾å“¡ 2013-12 ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ãƒãƒ¼ãƒ â—® ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ å±‹ã•ã‚“ â—® æ¤œç´¢æŠ€è¡“ > æ©Ÿæ¢°å¦ç¿’ â‰« ã‚¢ãƒ‰ãƒ†ã‚¯ â—® æœ€è¿‘ã¯è¨è¨ˆã—ãŸã‚ŠåŸºç›¤å¯„ã‚Šãªéƒ¨åˆ†ã‚’æ‹…å½“ã—ãŸã‚Š 3. è‡ªå·±ç´¹ä»‹ åå‰ ã„ ãª ä¼Šå¥ˆ ã‚Šã‚“ãŸã‚ã† æž—å¤ªéƒŽâ€ƒ (id:tarao @oarat) Scala æ´: 4ãƒ¶æœˆ â—® slick-jdbc-extension â—® åž‹ãƒ¬ãƒ™ãƒ«ã®ãƒ©ãƒ ãƒ€è¨ˆç®— â—® Software Design 2015 å¹´ 8 æœˆå· å¤§å¦æ™‚ä»£ã¯ â—® ç ”ç©¶å®¤: åž‹ç†è«–, ãƒ—ãƒã‚°ãƒ©ãƒ æ„å‘³è«–, è¨¼æ˜Žæ”¯æ´ç³» â—® OCaml ãŒå…¬ç”¨èªž â—® gradual typing
tom__bo 2015/08/02
ã¯ã¦ãª

Scala
ãƒªãƒ³ã‚¯
Scalaã«å˜åœ¨æ¼”ç®—åã‚’æ±‚ã‚ã‚‹ã®ã¯é–“é•ã£ã¦ã„ã‚‹ã ã‚ã†ã‹ - ã ã„ãŸã„ã‚ˆãã‚ã‹ã‚‰ãªã„ãƒ–ãƒã‚°
è¿½è¨˜ é–“é•ã£ã¦ã„ãªã„ã“ã¨ã‚’ç¤ºã—ã¦ã„ãŸã ã‘ã¾ã—ãŸ â†’ ã€ŒScalaã«å˜åœ¨æ¼”ç®—åã‚’æ±‚ã‚ã‚‹ã®ã¯é–“é•ã£ã¦ã„ã‚‹ã ã‚ã†ã‹ã€ã®è§£ç”ä¾‹ - scalaã¨ã‹ãƒ»ãƒ»ãƒ» ã•ã‚‰ã«Lensã§ã‚‚ã€€â†’ ã€ŒScalaã«å˜åœ¨æ¼”ç®—åã‚’æ±‚ã‚ã‚‹ã®ã¯é–“é•ã£ã¦ã„ã‚‹ã ã‚ã†ã‹ã€ã‚’Lens/Prismã§è§£ã„ã¦ã¿ã‚‹ - ç‹¬å¦å¤§å¦æƒ…å ±å¦éƒ¨ ï¼ˆé–“é•ã£ã¦ã„ãªã„ã‘ã©ã€ãã†ã„ã†æŠ½è±¡åŒ–ãŒé©åˆ‡ã¨ã¯è¨€ã£ã¦ã„ãªã„ï¼‰ ç²¾é€²ã›ãã°ãƒ»ãƒ»(Â´ï½¥_ï½¥`) è¿½è¨˜çµ‚ã‚ã‚Šã€‚ ã‚ãªãŸã¯ãã“ã«ã„ã¾ã™ã‹ CoffeeScriptã«ã¯å˜åœ¨æ¼”ç®—å?. ãŒã‚ã‚Šã¾ã™ã€‚ ã“ã‚Œã¯ã€JSONã®ã‚ˆã†ãªãƒã‚¹ãƒˆã—ãŸæ§‹é€ ã§ã€ã‹ã¤å€¤ãŒé€”ä¸ã§nullã«ãªã£ã¦ã‚‹ã‹ã‚‚ã—ã‚Œãªã„ã‘ã©ä¸€ç•ªå†…å´ã®å€¤ãŒæ¬²ã—ã„ï¼ ã¨ãã«ä¾¿åˆ©ãªä»•çµ„ã¿ã§ã™ã€‚ ã‚³ãƒ¼ãƒ‰ã¨ã—ã¦ã¯ obj = { e : { d : { c: { b: { a: { value: 1 } } } } } } # å˜åœ¨æ¼”ç®—åã‚’ä½¿ã£ã¦valueã«ã‚¢ã‚¯ã‚»ã‚¹ï¼ obj?.e
tom__bo 2015/07/12
Scala
ãƒªãƒ³ã‚¯
Scalaã®traitã¯ã©ã®ã‚ˆã†ãªclassãƒ•ã‚¡ã‚¤ãƒ«ã«å¤‰æ›ã•ã‚Œã‚‹ã‹ - ã ã„ãŸã„ã‚ˆãã‚ã‹ã‚‰ãªã„ãƒ–ãƒã‚°
ãŠã‚‚ã—ã‚ã„é †ã«è¨˜äº‹ã‚’æŠ•ç¨¿ã—ã¦ã„ãŸã‚‰ã€ã¨ã£ã¦ã‚‚å¤ããªã£ã¦ã—ã¾ã„ã¾ã—ãŸã€‚(Â´ï½¥_ï½¥`) ã—ã‹ã—ã€å†…å®¹è‡ªä½“ã¯å¤ããªã£ã¦ã¯ã„ãªã„ã¨æ€ã†ã®ã§ãã®ã¾ã¾æŠ•ç¨¿ã—ã¾ã™ã€‚(à¸‡ Ë˜Ï‰Ë˜ )à¸§ Scala2.12ã¨ã‹Java8ã¨ã‹ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå®Ÿè£…ä»˜ãinterfaceã¨ã‹ã¯çŸ¥ã‚Šã¾ã›ã‚“(ãƒ» Ï‰ ãƒ») traitã®å®Ÿè£… ScalaãŒå®Ÿéš›ã«ã¯ã©ã®ã‚ˆã†ã«traitã‚’å®Ÿç¾ã—ã¦ã„ã‚‹ã®ã‹ã‚’èª¿ã¹ã‚‹ãŸã‚ã«ã€ object A { trait X { def xx() = "xx" } def main(args: Array[String]) { val x = new X {} } } ãŒã©ã†ãªã£ã¦ã„ã‚‹ã‹ã‚’èª¿ã¹ã¾ã—ãŸã€‚ ç”Ÿæˆã•ã‚Œã‚‹ãƒ•ã‚¡ã‚¤ãƒ« > ls target/scala-2.11/classes/ ã‚’ã—ã¦ã¿ã‚‹ã¨ A.class A$.class A$X.class A$X$class.class A$$anon$1.class
tom__bo 2015/07/05
Scala
ãƒªãƒ³ã‚¯
1