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yoshuki 2025/08/30
JavaScript
ãƒªãƒ³ã‚¯
å±žæ€§ã¨ãƒ—ãƒãƒ‘ãƒ†ã‚£
ãƒ–ãƒ©ã‚¦ã‚¶ãŒãƒšãƒ¼ã‚¸ã‚’ãƒãƒ¼ãƒ‰ã™ã‚‹ã¨ãã€HTMLãƒ†ã‚ã‚¹ãƒˆã‚’ â€œèªã¿è¾¼ã¿â€ (åˆ¥ã®è¨€è‘‰: â€œãƒ‘ãƒ¼ã‚¹â€)ã€DOM ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’ç”Ÿæˆã—ã¾ã™ã€‚è¦ç´ ãƒŽãƒ¼ãƒ‰ã®å ´åˆã€ã»ã¨ã‚“ã©ã®æ¨™æº–ã®HTMLå±žæ€§ã¯è‡ªå‹•çš„ã« DOM ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã®ãƒ—ãƒãƒ‘ãƒ†ã‚£ã«ãªã‚Šã¾ã™ã€‚ ä¾‹ãˆã°ã€ã‚‚ã—ã‚¿ã‚°ãŒ <body id="page"> ã®å ´åˆã€DOM ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã¯ body.id="page" ã‚’æŒã¡ã¾ã™ã€‚ ã—ã‹ã—ã€å±žæ€§-ãƒ—ãƒãƒ‘ãƒ†ã‚£ã®ãƒžãƒƒãƒ”ãƒ³ã‚°ã¯1å¯¾1ã§ã¯ã‚ã‚Šã¾ã›ã‚“! ã“ã®ç« ã§ã¯ã€ã“ã‚Œã‚‰2ã¤ã®æ¦‚å¿µã‚’åˆ†ã‘ã€ãã‚Œã‚‰ãŒåŒã˜ã§ã‚ã‚‹ã¨ã/ç•°ãªã‚‹ã¨ãã«ã©ã®ã‚ˆã†ã«æŒ¯ã‚‹èˆžã†ã‹è¦‹ã¦ã„ãã¾ã™ã€‚ DOM ãƒ—ãƒãƒ‘ãƒ†ã‚£ç§ãŸã¡ã¯ã™ã§ã«çµ„ã¿è¾¼ã¿ã® DOM ãƒ—ãƒãƒ‘ãƒ†ã‚£ã‚’å¦ã³ã¾ã—ãŸã€‚å¤šãã®ãƒ—ãƒãƒ‘ãƒ†ã‚£ãŒã‚ã‚Šã¾ã™ãŒã€æŠ€è¡“çš„ãªåˆ¶é™ã¯ãªã„ãŸã‚ã€ä¸ååˆ†ã§ã‚ã‚Œã°ç‹¬è‡ªã®ãƒ—ãƒãƒ‘ãƒ†ã‚£ãŒè¿½åŠ ã§ãã¾ã™ã€‚ DOM ãƒŽãƒ¼ãƒ‰ã¯é€šå¸¸ã®JavaScriptã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã§ã™ã€‚ãã‚Œã‚’å¤‰æ›´ã§ãã¾ã™ã€‚ ä¾‹ãˆã°
yoshuki 2023/12/19
JavaScript
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JavaScript ã§ parseInt / parseFloat ã‚’ä½¿ã‚ãªã„æ–¹ãŒè‰¯ã„ç†ç”±
ã¨ãªã‚‹ã®ãŒåŽŸå› ã§ã™ã€‚parseInt ã¨ã„ã†ã®ã¯ã€æ–‡å—åˆ—ã‚’è§£æžã—ã¦æ•´æ•°å€¤ï¼ˆintï¼‰ã‚’è¿”ã™ã‚°ãƒãƒ¼ãƒãƒ«é–¢æ•°ã§ã‚ã‚Šã€å¼•æ•°ã‚’ã¾ãšæ–‡å—åˆ—ã«å¤‰æ›ã™ã‚‹ä»•æ§˜ã¨ãªã£ã¦ãŠã‚Šã¾ã™ã€‚ãã®æ®µéšŽã§ 0.0000005 ãŒ "5e-7" ã¨ã„ã†æ–‡å—åˆ—ã«å¤‰æ›ã•ã‚Œã¦ã—ã¾ã„ã€ãã®æ–‡å—åˆ—ã®å…ˆé ã® 5 ã ã‘ãŒæ•°å—ã¨ã—ã¦è§£æžã•ã‚Œã¦ã—ã¾ã£ãŸãŸã‚ã€çµæžœã¨ã—ã¦ parseInt(0.0000005) === 5 ã¨ãªã‚Šã¾ã—ãŸã€‚ ãªãœ String(0.000005) === "0.000005" ã«ã€String(0.0000005) === "5e-7" ã«ãªã‚‹ã®ã‹ã«ã¤ã„ã¦ã¯ã€ã“ã®è¨˜äº‹ã®æœ€å¾Œã§ä½™è«‡ã¨ã—ã¦èª¬æ˜Žã—ã¾ã™ã€‚ æ•´æ•°åŒ–ã«ã¯ Math.trunc ã‚’ä½¿ãŠã† ã“ã®ã‚ˆã†ã«ã€parseInt ã¯æ–‡å—åˆ—ã‚’å¼•æ•°ã«ã™ã‚‹ã“ã¨ã‚’å‰æã«ã—ã¦ã„ã‚‹ãŸã‚ã€é€Ÿåº¦ã®é¢ã§ã‚‚å¯èªæ€§ã®é¢ã§ã‚‚ã€Œå°æ•°å€¤ã‚’æ•´æ•°å€¤ã«å¤‰æ›ã—ãŸã„ã€ã¨ã„ã†å ´åˆã«ä½¿ã†ã®ã¯æœ›ã¾ã—ãã‚ã‚Šã¾ã›ã‚“ã€‚æœ€ã‚‚æœ›
yoshuki 2022/02/04
JavaScript
ãƒªãƒ³ã‚¯
ç´¢å¼•:è¨˜å·ã¨ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ | TypeScriptå…¥é–€ã€Žã‚µãƒã‚¤ãƒãƒ«TypeScriptã€
JavaScriptã‚„TypeScriptã®ã‚³ãƒ¼ãƒ‰ã«ã¯?.ã®ã‚ˆã†ãªè¨˜å·ã‚„asã®ã‚ˆã†ãªã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ãŒä½¿ã‚ã‚Œã¾ã™ã€‚ã“ã†ã„ã£ãŸè¨˜å·ã‚„ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã¯Googleã§æ¤œç´¢ã—ã¥ã‚‰ãã€æ„å‘³ã‚’èª¿ã¹ã‚‹ã®ã¯é›£ã—ã„ã‚‚ã®ã§ã™ã€‚ ã“ã®ç´¢å¼•ã¯ã€JavaScriptã¨TypeScriptã®è¨˜å·ã‚„ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã‹ã‚‰ã€ãã®åå‰ã‚„æ„å‘³ã‚’èª¿ã¹ã‚‰ã‚Œã‚‹ã‚ˆã†ã«ã™ã‚‹ãŸã‚ã®ã‚‚ã®ã§ã™ã€‚ã‚³ãƒ¼ãƒ‰ã‚’èªã‚“ã§ã„ã¦æœªçŸ¥ã®è¨˜å·ã‚„ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã«å‡ºãã‚ã—ãŸã‚‰ã€ãã®æ„å‘³ã‚„ä½¿ã„æ–¹ã‚’èª¿ã¹ã‚‹æ‰‹ãŒã‹ã‚Šã«ã—ã¦ãã ã•ã„ã€‚ ã“ã“ã§æ‰±ã†è¨˜å·ã¨ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã«ã¯ã€JavaScriptç”±æ¥ã®ã‚‚ã®ã€ã¤ã¾ã‚Šã€JavaScriptã¨TypeScriptã«å…±é€šã—ã¦ä½¿ãˆã‚‹ã‚‚ã®ã¨ã€TypeScriptã§ã®ã¿ä½¿ãˆã‚‹ã‚‚ã®ã‚’ä½µè¨˜ã—ã¦ã„ã¾ã™ã€‚JavaScriptç”±æ¥ã®ã‚‚ã®ã«ã¯ã®ãƒžãƒ¼ã‚¯ã‚’ã€TypeScriptå›ºæœ‰ã®ã‚‚ã®ã«ã¯ãƒžãƒ¼ã‚¯ã‚’è¡¨ç¤ºã—ã¦ã„ã¾ã™ã€‚ è¨˜å·â€‹! è«–ç†å¦å®šæ¼”ç®—å (logical not operator
yoshuki 2021/08/30
TypeScript

JavaScript
ãƒªãƒ³ã‚¯
There's Always More History
Last month I researched two historical questions. I originally posted summaries on Twitter and am reproducing both here.1 Why Vim Uses hjkl Question: Why does Vim use hjkl and not the arrow keys for navigation? Common Explanation: It keeps your fingers on the home row. Historical Explanation: Bill Joy developed vi on the ADM-3A, which didnâ€™t have dedicated arrow keys. If you look at the ADM keyboa
yoshuki 2021/04/13
Vim

JavaScript
ãƒªãƒ³ã‚¯
Fisherâ€“Yates Shuffle
Say you had a fresh pack of cards: If you want to play a game of Texas Hold â€˜em with friends, you should shuffle the deck first to randomize the order and insure a fair game. But how? A simple but effective way of doing this is to pull a random card from the deck repeatedly and set it aside, incrementally building a new stack. As long as you pick each rem aining card from the deck with equal probab
yoshuki 2020/05/21
JavaScript
ãƒªãƒ³ã‚¯
ðŸš€âš™ï¸ JavaScript Visualized: the JavaScript Engine
DEV Community Follow A space to discuss and keep up software development and manage your software career Open Forem Follow A general discussion space for the Forem community. If it doesn't have a home elsewhere, it belongs here Future Follow News and discussion of science and techno logy such as AI, VR, cryptocurrency, quantum computing, and more.
yoshuki 2020/01/03
JavaScript
ãƒªãƒ³ã‚¯
ç¾ä»£ãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ã«æ¬ ã‹ã›ãªã„webpackã¨Babelã‚’ç†è§£ã—ã‚ˆã†
Transcript Ý±à…Ï‘Ï©Ï¯Ï„Î¤Ï¯Ï…Í´Ü½Í”Í¤Í³Íâ€¨ XFCQBDLÍ±#BCFMÎ›à½§Õ²Í Î‘ÍÊ‚ï¿½ CVJMEFSTDPOï¿½UPLZPï¿½ï¿½ï¿½ï¿½ï¿½ /BNFï¿½ ï¿½ï¿½ï¿½ï¿½4BLJUPï¿½.VLBJï¿½ 5XJUUFSâ€¨ ï¿½ï¿½ï¿½ï¿½!@@TBLJUP@@ï¿½ $PNQBOZï¿½ ï¿½ï¿½ï¿½ï¿½$ZCP[Vï¿½JODï¿½â€¨ ï¿½ï¿½ï¿½ï¿½'SPOUFOEï¿½&YQFSUï¿½5FBN "CPVUï¿½NF w#BCFMÍ·àª²Í´Ý±à¡Í·+BWB4DSJQUÍ´ÍÍÍ¯ï¿½ w#BCFMÍ´ÍÍÍ¯ï¿½ wXFCQBDLÍ´ÍÍÍ¯ï¿½ wXFCQBDL #BCFMÍ°à²ºà·¦à£®à«·Î›à¯¥Í¬Í¯ÍÍ˜ "HFOEB #BCFMÍ·àª²Í´Ý±à¡Í·+BWB4DSJQUÍ´ÍÍÍ¯ &$."4DSJQUÍ±5$ï¿½ï¿½ w+BWB4DSJQUÍ´Í¸&$."4DSJQUÍ±ÍÍÝ´Þ à¢“à¼·Í•Í‹Î”ï¿½ wÍœÍ·Ý´Þ à¢“à¼·Î›Ü¾ÎŠÍ¯ÍÎ”Ò•Ò»Õ±Í•5$ï¿½ï¿½â€¨ 5FDIOJDBMï¿½$PNNJUUFFï¿½ï¿½ï¿½ ï¿½ w&4ï¿½ï¿½
yoshuki 2019/08/31
JavaScript
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GitHub - goldbergyoni/javascript-testing-best-practices: ðŸ“—ðŸŒ ðŸš¢ Comprehensive and exhaustive JavaScript & Node.js testing best practices (August 2025)
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yoshuki 2019/08/24
JavaScript
ãƒªãƒ³ã‚¯
JavaScriptã®æœ¬ã‚’æ›¸ãã¨ãã«å‚è€ƒã«ã—ã¦ã‚‹ã‚‚ã®
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yoshuki 2019/06/14
JavaScript
ãƒªãƒ³ã‚¯
JavaScriptã§ã®è³¢ã„console.log( )ã®ä½¿ã„æ–¹ & ãã®ä»–ä¾¿åˆ©ãªconsole.xxx( )ä½¿ã„æ–¹ã¾ã¨ã‚ (dirãƒ»tableãƒ»warnãƒ»groupã¨ã‹) - Qiita
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yoshuki 2019/05/18
JavaScript
ãƒªãƒ³ã‚¯
Babelã§æ›¸ã‹ã‚ŒãŸJavaScriptãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’TypeScriptã¸ç§»è¡Œã™ã‚‹æ–¹æ³•
Babelã‚’ä½¿ã£ã¦JavaScriptã§æ›¸ã„ã¦ã„ãŸãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’TypeScriptã¸ãƒžã‚¤ã‚°ãƒ¬ãƒ¼ã‚·ãƒ§ãƒ³ã™ã‚‹æ–¹æ³•ã«ã¤ã„ã¦ã®ãƒ¡ãƒ¢æ›¸ãã§ã™ã€‚ æ•°åå›žã¯ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚„ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®ã‚³ãƒ¼ãƒ‰ãƒ™ãƒ¼ã‚¹ã‚’JavaScriptã‹ã‚‰TypeScriptã¸å¤‰æ›ã—ã¦ã„ã‚‹ã®ã§ã€ ã‚ã‚‹ç¨‹åº¦ã‚„ã‚Šæ–¹ãŒãƒ‘ã‚¿ãƒ¼ãƒ³åŒ–ã•ã‚Œã¦ã„ã¾ã™ã€‚ ã“ã®è¨˜äº‹ã§ã¯ã€è‡ªåˆ†ãŒã‚ˆãåˆ©ç”¨ã—ã¦ã„ã‚‹æ¬¡ã®æ§‹æˆã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’å…ƒã«ã—ã¦ã„ã¾ã™ Babel 6 or 7 Mocha + @babel/register ã“ã®æ§‹æˆã‚’ã€æ¬¡ã®ã‚ˆã†ãªTypeScriptã‚’ä½¿ã£ãŸæ§‹æˆã¸ã¨å¤‰æ›ã—ã¦ã„ãã¾ã™ã€‚ Babel -> TypeScript Mocha + ts-node + ts-node-test-register Babelã§æ›¸ã‹ã‚ŒãŸãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’TypeScriptã¸å¤‰æ› ä»Šå›žã¯textlint-rule-helperã¨ã„ã†ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’ä¾‹ã«ã—ã¦ã„ãã¾ã™ã€‚ ã“ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã¯
yoshuki 2019/01/10
JavaScript

TypeScript
ãƒªãƒ³ã‚¯
Learn JavaScript
Learn JavaScriptThe easiest way to Â learnÂ & Â practiceÂ modern JavaScriptLearn in an interactive environment. Read short lessons, take notes, and complete challenges directly in your browser. Try it out â†’Anonymous cookies are used to improve the quality of the course. Learn modern JavaScript (ES2015+) from scratch, and practice in an intuitive environment. The challenges are inspired by real-world
yoshuki 2019/01/04
JavaScript
ãƒªãƒ³ã‚¯
JavaScriptã®ç‰å€¤æ¯”è¼ƒã‚’å…¨éƒ¨ç†è§£ã™ã‚‹ - Qiita
çš†ã•ã‚“ã“ã‚“ã«ã¡ã¯ã€‚ä»Šå›žã®è¨˜äº‹ã§ã¯JavaScriptã®ç‰å€¤æ¯”è¼ƒã«ã¤ã„ã¦è¦‹ã¦ã„ã“ã†ã¨æ€ã„ã¾ã™ã€‚ ã€Œã©ã†ã›==ã¨===ã®é•ã„ã¨ã‹ã ã‚ï¼Ÿã€€ä»Šã•ã‚‰ãã‚“ãªè¨˜äº‹æ›¸ããªã‚ˆãƒãƒ¼ã‚«ï½—ã€ã¨æ€ã£ãŸäººã¯ãœã²æœŸå¾…ã›ãšã«èªã¿é€²ã‚ã¦ã¿ã¦ãã ã•ã„ã€‚ ã€Œã˜ã‚ƒã‚Object.isã§ã—ã‚‡ï¼Ÿã€€çŸ¥ã£ã¦ã‚‹çŸ¥ã£ã¦ã‚‹ã€ä½¿ã£ãŸã“ã¨ãªã„ã‘ã©ã€ã¨æ€ã£ãŸäººã¯ã¾ã‚èªã¾ãªãã¦ã‚‚å¤§ä¸ˆå¤«ã§ã™ã€‚ ã•ã¦ã€ç‰å€¤æ¯”è¼ƒã¨ã„ã†ã®ã¯ã€2ã¤ã®å€¤ãŒç‰ã—ã„ã‹ã©ã†ã‹åˆ¤å®šã™ã‚‹ã“ã¨ã§ã™ã€‚JavaScriptã«ãŠã„ã¦ç‰å€¤æ¯”è¼ƒã¯ã©ã®ã‚ˆã†ã«è¡Œã†ã®ã‹ã€ãã—ã¦ã©ã®ã‚ˆã†ãªå ´é¢ã§ç‰å€¤æ¯”è¼ƒãŒç™ºç”Ÿã™ã‚‹ã®ã‹ã‚’ã“ã®è¨˜äº‹ã§ã¯ä½™ã™ã“ã¨ãªãç´¹ä»‹ã—ã¾ã™ã€‚ ä»¥é™ã€ã“ã®è¨˜äº‹ã§ä»•æ§˜æ›¸ã¨ã„ã†å ´åˆã¯ECMAScriptÂ® 2018 Language Specificationã‚’æŒ‡ã™ã‚‚ã®ã¨ã—ã¾ã™ã€‚ ==ã¨=== ã¨ã¯ã„ãˆã€ã¾ãšã¯==ã¨===ã®è©±ã‚’ã—ãªã„ã“ã¨ã«ã¯å§‹ã¾ã‚Šã¾ã›ã‚“ã€‚==ã¯JavaScriptåˆå¿ƒè€…ãŒã¨ã‚Šã‚ãˆãšç¿’
yoshuki 2018/11/20
JavaScript
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yoshuki 2018/11/09
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yoshuki 2018/10/27
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yoshuki 2018/07/15
JavaScript
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yoshuki 2018/03/08
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yoshuki 2018/01/05
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yoshuki 2017/12/26
JavaScript
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