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sugyan id:sugyan

errorã«é–¢ã™ã‚‹sugyanã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (11)

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Rust ã‚¨ãƒ©ãƒ¼å‡¦ç†2020 - é›»æ°—ã²ã¤ã˜ç‰§å ´
ã“ã®ã‚¨ãƒ³ãƒˆãƒªã¯ï¼ŒRust 3 Advent Calendar 2020ã®8æ—¥ç›®ã®è¨˜äº‹ã§ã™ï¼Ž ã¯ã˜ã‚ã« ã‚¨ãƒ©ãƒ¼å‡¦ç†ã®åŸºæœ¬ Result<T, E> Errorãƒˆãƒ¬ã‚¤ãƒˆ ?ã‚ªãƒšãƒ¬ãƒ¼ã‚¿ ãƒ™ã‚¹ãƒˆãƒ—ãƒ©ã‚¯ãƒ†ã‚£ã‚¹ã‚’æ”¯ãˆã‚‹ã‚¯ãƒ¬ãƒ¼ãƒˆ anyhow thiserror failureã‚¯ãƒ¬ãƒ¼ãƒˆã«ã¤ã„ã¦ ã¾ã¨ã‚ è¿½è¨˜ ã¯ã˜ã‚ã« Rustã‚’æ›¸ã„ã¦ã„ã‚‹æ™‚ã«ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³å›ºæœ‰ã®ã‚¨ãƒ©ãƒ¼åž‹ã‚’å®šç¾©ã—ãŸã„å ´åˆãŒã‚ã‚Šã¾ã™ï¼Žã“ã®è¾ºã®ãƒ™ã‚¹ãƒˆãƒ—ãƒ©ã‚¯ãƒ†ã‚£ã‚¹ã¯ä»Šã¾ã§ä½•åº¦ã‹å¤‰åŒ–*1ã—ã¦ãŠã‚Šï¼Œä»Šå¹´ã®9æœˆã«ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ã®ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã‚°ãƒ«ãƒ¼ãƒ—ãŒç™ºè¶³*2ã—ãŸã“ã¨ã‹ã‚‰ã‚‚åˆ†ã‹ã‚‹ã¨ãŠã‚Šï¼Œä»Šå¾Œã‚‚å¤‰åŒ–ã—ã¦ã„ãå¯èƒ½æ€§ãŒæ¿ƒåŽšã§ã™ï¼Ž ã“ã®è¨˜äº‹ã§ã¯ï¼Œã‚¨ãƒ©ãƒ¼å‡¦ç†ã¾ã‚ã‚Šã«é–¢ã™ã‚‹åŸºæœ¬çš„ãªå†…å®¹ã¨ï¼Œç¾æ™‚ç‚¹ã§ã®ãƒ™ã‚¹ãƒˆãƒ—ãƒ©ã‚¯ãƒ†ã‚£ã‚¹ã¨ã•ã‚Œã¦ã„ã‚‹anyhowã¨thiserrorã‚’ç”¨ã„ãŸã‚¨ãƒ©ãƒ¼å‡¦ç†ã«ã¤ã„ã¦ç´¹ä»‹ã—ã¾ã™ï¼Ž ã‚¨ãƒ©ãƒ¼å‡¦ç†ã®åŸºæœ¬ Result<T, E> Rustã«ã¯ä¾‹å¤–
sugyan 2020/12/08
Rust

error
ãƒªãƒ³ã‚¯
ã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã¯ 2W1H ãŒã„ã„ã‚“ã˜ã‚ƒãªã„ã‹
è‰¯ãã‚ã‚‹ãƒ€ãƒ¡ãªã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ ã‚¨ãƒ©ãƒ¼ãŒèµ·ããŸã¨ãã¯ã€ä»¥ä¸‹ã®ã‚ˆã†ã«ã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã‚’ã©ã“ã‹ã—ã‚‰ã«å‡ºåŠ›ã™ã‚‹ã¨æ€ã„ã¾ã™ã€‚ $c->log->error('something wrong!'); ãŸã ã€ã“ã®ã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã£ã¦ã€å®Ÿéš›ã«ç™ºç”Ÿã—ãŸã¨ãã«ã¯æ„å‘³ãŒã‚ã‹ã‚‰ãªã„ã“ã¨ãŒå¤šã„ã®ã§ã™ã€‚ $c->log->error('error!'); æœ¬æ°—ã§ã“ã†ã„ã†ã€Œerror!ã€ã¨ã ã‘åããƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã ã¨ã€ã‚¨ãƒ©ãƒ¼ãŒèµ·ããŸã“ã¨ã—ã‹ä¼ã‚ã£ã¦ãã¾ã›ã‚“ã€‚ç¨‹åº¦ã®å·®ã¯ã‚ã‚Œæ„å‘³ã®ã‚ã‹ã‚‰ãªã„ã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã¯ã“ã®ä¸–ã«ã‚ãµã‚Œã¦ã„ã‚‹ã‹ã¨æ€ã„ã¾ã™ã€‚ æ©Ÿæ¢°çš„ãªã‚¨ãƒ©ãƒ¼æƒ…å ± ãã†ã„ã†ã‚ã‘ã§ã€ãŸã„ã¦ã„ã¯ Exception ã‚¯ãƒ©ã‚¹ã‚„ Logger ã‚¯ãƒ©ã‚¹ã§å¤šãã®è£œåŠ©ãŒå—ã‘ã‚‰ã‚Œã‚‹ã‚ˆã†ã«ãªã£ã¦ã„ã‚‹ã¨æ€ã„ã¾ã™ã€‚ ç™ºç”Ÿæ™‚åˆ» ç™ºç”Ÿå ´æ‰€ stack trace å¤‰æ•°ã®çŠ¶æ…‹ ãŸã ã€ã“ã®ã‚ˆã†ãªæ©Ÿæ¢°çš„ãªæƒ…å ±ã ã‘ã ã¨ã€çµå±€ã€é‹ç”¨ä¸Šã¯å¯¾å¿œãŒé›£ã—ã„å ´é¢ã£ã¦ã®ãŒå¤šã‹
sugyan 2016/07/20
development

error

log
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Node.js ã«ãŠã‘ã‚‹ Promise ã‚’ä½¿ã£ãŸä¾‹å¤–å‡¦ç† - from scratch
ã•ã¦ã€ Node.js ã®ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ã¯é›£ã—ã„ã¨è¨€ã‚ã‚Œã¦ã¾ã™ãŒã€ 2016å¹´ç¾åœ¨ã€ã¤ã¾ã‚ŠNodeã® v4 ã¨ã‹ v6 ãŒä¸»æµã«ãªã‚Šã€ Promise ãŒåŸºæœ¬çš„ãªå‡¦ç†ã¨ã—ã¦æŽ¡ç”¨ã•ã‚Œã¦ã„ã‚‹çŠ¶æ³ã§ã¯ã©ã†ã§ã—ã‚‡ã†ã‹ã€‚ã¡ã‚‡ã£ã¨è€ƒãˆã¦ã¿ã¾ã™ã€‚ ä¸€å¿œã“ã‚Œã®è£œè¶³ã§ã™ã€‚ qiita.com TL;DR æœªã ã«é›£ã—ã„ã€‚ãŸã ã—ã€ Promise ã§æ”¹å–„ã•ã‚Œã¦ã„ã‚‹ã€‚async-await ã‚„ zone ã¾ã§æ¥ãŸã‚‰ã‹ãªã‚Šæ¥½ã«ãªã‚‹ã€‚ ã‚ã¨ã€ unhandledRejection ãŒ uncaughtException ã‚ˆã‚Šã‚‚é…·ã„ã“ã¨ã«ãªã‚‰ãªã„ã®ã§ã€å¤§åˆ†ãƒžã‚·ã«ãªã£ã¦ã„ã‚‹ã€‚ Node.js ã®ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ã®é›£ã—ã• ã¾ãš JavaScript ã«ã¯åŒæœŸã¨éžåŒæœŸã®ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ã®ã‚„ã‚Šæ–¹ãŒã‚ã‚Šã¾ã™ã€‚å‰è€…ã¯æ‰€è¬‚ try-catch ã«ã‚ˆã‚‹æ–¹æ³•ã€å¾Œè€…ã¯ callback ã‚’ä½¿ã£ã¦ç¬¬ä¸€å¼•æ•°ã§å®Ÿç¾ã™ã‚‹æ–¹æ³•ã‚„ em it(
sugyan 2016/07/12
nodejs

promise

error

exception
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Errors are values - The Go Programming Language
Rob Pike 12 January 2015 A common point of discussion among Go programmers, especially those new to the language, is how to handle errors. The conversation often turns into a lament at the number of times the sequence if err != nil { return err } shows up. We recently scanned all the open source projects we could find and discovered that this snippet occurs only once per page or two, less often th
sugyan 2015/01/13
golang

error
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Golang Error Handling lesson by Rob Pike - Block Rockinâ€™ Codes
Intro ã“ã®è¨˜äº‹ã¯ Go Advent Calendar 2014 ã® 15 æ—¥ç›®ã®è¨˜äº‹ã§ã™ã€‚ ä¾‹ãˆã°ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®ãƒ•ãƒ¬ãƒ¼ãƒ å‡¦ç†çš„ãªã‚‚ã®ã‚’æ›¸ã„ã¦ã„ã‚‹å ´åˆã€ä»¥ä¸‹ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ãŒã‚ˆãã§ã¦ãã¾ã™ã€‚ There are many codes like this, while writing a Network Frame Parser program. var type uint8 err = binary.Read(r, binary.BigEndian, &type) if err != nil { return err } var length uint32 err = binary.Read(r, binary.BigEndian, &length) if err != nil { return err } ... é–¢æ•°ã®ä¸ã§ã¯ã€å„è¦ç´ ã®é•·ã•æ¯Žã«èªã¿è¾¼ã‚“ã§ã€èªã¿è¾¼ã¿ã«å¤±æ•—ã—ãŸã‚‰ã‚¨ãƒ©ãƒ¼ã‚’
sugyan 2015/01/13
golang

error
ãƒªãƒ³ã‚¯
GitHub - yuskesh/jsdojo: This repo includes additional material on JSDojo#1
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sugyan 2013/05/20
nodejs

JavaScript

error

tutorial
ãƒªãƒ³ã‚¯
node-v0.6.18ã‹ã‚‰ã‚¨ãƒ©ãƒ¼è¡¨ç¤ºãŒã‚ã‹ã‚Šã‚„ã™ããªã‚Šã¾ã™ã€‚ - ã¼ã¡ã¼ã¡æ—¥è¨˜
ä»Šã¾ã§ã‚ã‚‹ç¨‹åº¦ Node.js ã‚’ä½¿ã£ãŸã“ã¨ãŒã‚ã‚‹æ–¹ã¯ã€ä»¥ä¸‹ã®ã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã‚’ï¼‘åº¦ã‚„ï¼’åº¦ç›®ã«ã—ãŸã“ã¨ãŒã‚ã‚‹ã®ã§ã¯ãªã„ã§ã—ã‚‡ã†ã‹ã€‚ node.js:201 throw e; // process.nextTick error, or 'error' event on first tick ã“ã‚Œã¯ä»¥å‰ã®è¨˜äº‹ Node.js ã®ã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã®è¬Ž ã§ã‚‚è§£èª¬ã—ã¾ã—ãŸãŒã€ç§ãŒã‚ˆãè¦‹ã‚‹ã®ã¯å˜åœ¨ã—ãªã„ã‚¹ã‚¯ãƒªãƒ—ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚’æŒ‡å®šã—ã¦ Node ã‚’èµ·å‹•ã—ãŸæ™‚ã«ç¾ã‚Œã‚‹ã‚¨ãƒ©ãƒ¼ã¨ã—ã¦ã§ã™ã€‚ãã®ä»–ã€ // error.js if(true) { throw new Error('hoge'); } ãªã©ã‚¹ã‚¯ãƒªãƒ—ãƒˆã‚„ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«å†…ã§ã‚¨ãƒ©ãƒ¼ã‚’ throw ã—ãŸæ™‚ã«ã‚‚ã€ $ node ~/error.js node.js:249 throw e; // process.nextTick error, or 'error'
sugyan 2012/05/10
nodejs

error

exception
ãƒªãƒ³ã‚¯
node.js ã«ãŠã‘ã‚‹ã‚¨ãƒ©ãƒ¼å‡¦ç†ã®ã‚³ãƒ¼ãƒ‡ã‚£ãƒ³ã‚°ãƒ‘ã‚¿ãƒ¼ãƒ³ (ã‚‚ã—ãã¯éžåŒæœŸ JavaScript ã«ãŠã‘ã‚‹ä¾‹å¤–å‡¦ç†) - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´
node.js ã‚’ä»£è¡¨ã¨ã™ã‚‹ JavaScript ã‚’ç”¨ã„ãŸéžåŒæœŸãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ç’°å¢ƒã«ãŠã„ã¦ã¯ã€ã‚³ãƒ¼ãƒ‡ã‚£ãƒ³ã‚°ãƒ‘ã‚¿ãƒ¼ãƒ³ã®ãƒ™ã‚¹ãƒˆãƒ—ãƒ©ã‚¯ãƒ†ã‚£ã‚¹ãŒå…±æœ‰ã•ã‚Œã¦ãŠã‚‰ãšã€çµæžœã¨ã—ã¦å“è³ªã®ä½Žã„ã‚³ãƒ¼ãƒ‰ãŒå¤šããªã‚‹ã¨ã„ã†å•é¡ŒãŒã‚ã‚‹ã‚ˆã†ã«æ€ã„ã¾ã™ã€‚ãã“ã§ã€ç‰¹ã«ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’ã©ã†æ›¸ãã¹ãã‹ã€æ—¢å˜ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’ä½¿ã†æ–¹æ³•ã‚’ç´¹ä»‹ã—ã¦ã¿ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ ã„ããªã‚Šã§ã™ãŒã€ãƒ•ã‚¡ã‚¤ãƒ«ã®æ–‡å—æ•°ã‚’è¿”ã™é–¢æ•°ã‚’ä½œã‚‹ã“ã¨ã‚’è€ƒãˆã¦ã¿ã¾ã™ã€‚Java ã ã¨ä»¥ä¸‹ã®ã‚ˆã†ãªæ„Ÿã˜ã«ãªã‚‹ã§ã—ã‚‡ã†ã‹ã€‚countChars ãƒ¡ã‚½ãƒƒãƒ‰ã«æ³¨ç›®ã™ã‚‹ã¨ã€ã‚¨ãƒ©ãƒ¼ã‚’ä¾‹å¤–ã¨ã—ã¦æ‰±ã£ã¦ã„ã¦ã€ãƒ¢ã‚¸ãƒ¥ãƒ©ãƒ¼ã‹ã¤ç°¡æ½”ã«ãªã£ã¦ã„ã‚‹ã“ã¨ãŒã‚ã‹ã‚Šã¾ã™ã€‚ class FileCounter { static long countChars(String filename) throws IOException { FileInputStream is = new FileInputStre
sugyan 2012/04/20
nodejs

async

error
ãƒªãƒ³ã‚¯
ãƒ’ãƒ¥ãƒ¼ãƒžãƒ³ã‚¨ãƒ©ãƒ¼ ç†è«–ã¨å¯¾ç–
sugyan 2012/03/30
error

theory
ãƒªãƒ³ã‚¯
Node.js ã®ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚° - 2011-12-13 - æ—¥è¨˜
JavaScript Advent Calendar 2011 (Node.js/WebSocketsã‚³ãƒ¼ã‚¹) ã® 13 æ—¥ç›®ã®è¨˜äº‹ã§ã™ï¼Ž Node ã¨ã„ãˆã°éžåŒæœŸãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã§ã™ãŒï¼Œãã®ã‚¹ã‚¿ã‚¤ãƒ«ã¯å¤§é›‘æŠŠã«ã‚ã‘ã¦ 2 ç¨®é¡žã‚ã‚Šã¾ã™ï¼Žä¸€ã¤ç›®ã¯ fs ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ãªã©ã§ä½¿ã‚ã‚Œã¦ã„ã‚‹ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯é–¢æ•°ã®ã‚¹ã‚¿ã‚¤ãƒ«ï¼Ž fs.readFile(path, function(err, content) { if (err) { // ã‚¨ãƒ©ãƒ¼æ™‚ã®å‡¦ç† return; } // æˆåŠŸæ™‚ã®å‡¦ç† });ã“ã®ã‚¹ã‚¿ã‚¤ãƒ«ã¯ï¼Œä½•ã‚‰ã‹ã®è¦æ±‚ã«å¯¾ã™ã‚‹çµæžœã‚’ä¸€ç™ºã§å—ã‘å–ã‚‹ (è¦æ±‚ã¨çµæžœãŒ 1 å¯¾ 1) å ´åˆã«ä½¿ã‚ã‚Œã¾ã™ï¼Žãã—ã¦ï¼Œã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯é–¢æ•°ã®ç¬¬1å¼•æ•°ã§ã‚¨ãƒ©ãƒ¼ã®æœ‰ç„¡ãŒé€šçŸ¥ã•ã‚Œã¾ã™ï¼Žã‚¨ãƒ©ãƒ¼ãŒãªã‘ã‚Œã° nullï¼Œã‚¨ãƒ©ãƒ¼ãŒã‚ã£ãŸå ´åˆã¯ Error ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã¨ã„ã†ã®ãŒåŽŸå‰‡ã®ã‚ˆã†ãªæ°—ãŒã—ã¾ã™ãŒï¼Œundefined ãŒæ¸¡ã•ã‚ŒãŸã‚Šã™ã‚‹
sugyan 2011/12/13
"Node.js ã®ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚° "

nodejs

adventcalendar

error
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ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’æ›¸ã„ã¦ã¯ã„ã‘ãªã„
ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’æ›¸ã„ã¦ã¯ã„ã‘ãªã„ç”°ä¸è‹±è¡ŒÂ tanaka.hideyuki@gmail.com 2011/12/08Â @PFIã‚»ãƒŸãƒŠãƒ¼ è‡ªå·±ç´¹ä»‹ç”°ä¸è‹±è¡ŒÂ (@tanakh,Â http://tanakh.jp) PFIç¤¾ã§ãƒ—ãƒã‚°ãƒ©ãƒžã‚„ã£ã¦ã¾ã™Jubatuspficommonæ¤œç´¢ã‚¨ãƒ³ã‚¸ãƒ³ã®ã‚³ã‚¢ã‚¨ãƒ³ã‚¸ãƒ³Haskellæ„›å¥½å®¶msgpackÂ /Â rpcÂ /Â idlpeggyÂ (ãƒ‘ãƒ¼ã‚¶ã‚¸ã‚§ãƒãƒ¬ãƒ¼ã‚¿Â &Â QQÂ w/Â AQ)Shu-thingÂ (ã‚·ãƒ¥ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚²ãƒ¼ãƒ )Â /Â (MonadiusÂ ãƒ¡ãƒ³ãƒ†ãƒŠ)ä»Šæ°—ã«ãªã‚‹ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ã¯Â monad-controlLearnÂ youÂ aÂ HaskellÂ é‹æ„ç¿»è¨³ä¸Â ï¼ˆæ˜¥é ƒç™ºå£²äºˆå®šï¼‰ ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’æ›¸ã„ã¦ã¯ã„ã‘ãªã„æœ¬æ—¥ã®æ¦‚è¦ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’æŠ½è±¡åŒ–ã—ã‚ˆã†ã¨ã„ã†ãŠè©±ã§ã™ ç¾åœ¨ã®ã‚¨ãƒ©ãƒ¼å‡¦ç†ã®æŠ±ãˆã‚‹å•é¡Œã©ã®ã‚ˆã†ã«è§£æ±ºã™ã‚‹ã®ã‹å®Ÿéš›ã®ä¾‹ã‚¨ãƒ©ãƒ¼ã¯å‡¦ç†ã—ãªã‘ã‚Œã°ãªã‚‰ãªã„ ã‚¨ãƒ©ãƒ¼å‡¦ç†ã‚’æ›¸ã„ã¦ã¯ã„ã‘ãª
sugyan 2011/12/12
error

programming

haskell
ãƒªãƒ³ã‚¯
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