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What is This in JavaScript? - Telerik Blogs
As weâ€™ve seen in a previous article, scope is an important concept in JavaScript that can sometimes be confusing to developers. On a similar note, context and the this keyword are as important and - unfortunately - just as confusing. In this article, weâ€™ll cover: What context and this mean in JavaScript; What explicit bindings and hard bindings are; What the new operator represents; How this is di
seapig_dolphin 2017/11/08
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JavaScript

this
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Promise Error Handling
Promise Error Handling ç´„æŸã•ã‚ŒãŸã‚¨ãƒ©ãƒ¼ Promiseã¨ã‚¨ãƒ©ãƒ¼ã®åŸºæœ¬ Promiseå†…ã§èµ·ããŸä¾‹å¤–ã¯è‡ªå‹•ã§ã‚ãƒ£ãƒƒãƒã•ã‚Œã‚‹ ã‚¨ãƒ©ãƒ¼å‡¦ç†ã¯.catch(fn)ã§è¡Œã† var promise = new Promise(function(){ throw new Error("ä¾‹å¤–"); }); promise.catch(function(error){ // ä¾‹å¤–ã‚’ã‚ãƒ£ãƒƒãƒã§ãã‚‹ }); ã‚ˆãã‚ã‚‹å•é¡Œ .catch(fn) ã‚’ã—ãªã„ã¨ã‚¨ãƒ©ãƒ¼ãƒã‚°ã‚‚å‡ºã›ãªã„ .catch(fn) ã‚’ã—ã‚ã™ã‚Œã¦ã‚¨ãƒ©ãƒ¼ã®æ¡ã‚Šã¤ã¶ã—ãŒèµ·ãã‚‹ = unhandled rejectionã€€(.catchã‚’ã—ã¦ãªã„promise) 4.6. Promise.prototype.done ã¨ã¯ä½•ã‹? ç¾çŠ¶ã®unhandled rejectionã¸ã®å¯¾å¿œ unhandled rejectionãŒç™ºç”Ÿã—ãŸ
seapig_dolphin 2017/09/06
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promise

JavaScript
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ã¯ã¦ãªæ•™ç§‘æ›¸ JavaScriptç·¨
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seapig_dolphin 2017/08/04
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javascript

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JavaScriptã®åŒæœŸã€éžåŒæœŸã€ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯ã€ãƒ—ãƒãƒŸã‚¹è¾ºã‚Šã‚’æ•´ç†ã—ã¦ã¿ã‚‹ - Qiita
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seapig_dolphin 2017/08/02
javascript

éžåŒæœŸ
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Getting Started â€“ Pug
Installation Â¶ Pug is available via npm: $ npm install pug Overview Â¶ The general rendering process of Pug is simple. pug.compile() will compile the Pug source code into a JavaScript function that takes a data object (called â€œlocalsâ€) as an argument. Call that resultant function with your data, and voilÃ !, it will return a string of HTML rendered with your data. The compiled function can be re-use
seapig_dolphin 2017/05/25
pug

javascript

jade
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JavaScriptã‚’ã‚ãã‚‹ãƒ‘ãƒ©ãƒ¬ãƒ«ãƒ¯ãƒ¼ãƒ«ãƒ‰ ã€œWebãƒ‡ã‚¶ã‚¤ãƒŠãƒ¼ã‹ã‚‰è¦‹ãŸä»Šã©ãã®ãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰äº‹æƒ…ã€œï½œdwango creators' blogï¼ˆãƒ‰ãƒ¯ãƒ³ã‚´ã‚¯ãƒªã‚¨ã‚¤ã‚¿ãƒ¼ã‚ºãƒ–ãƒã‚°ï¼‰
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seapig_dolphin 2017/05/24
JavaScript
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ã‚¹ãƒ—ãƒ¬ãƒƒãƒ‰æ§‹æ–‡ (...) - JavaScript | MDN
This feature is well established and works across many devices and browser versions. Itâ€™s been available across browsers since 2015å¹´10æœˆ. Learn more See full compatibility Report feedback ã‚¹ãƒ—ãƒ¬ãƒƒãƒ‰æ§‹æ–‡ (...) æ§‹æ–‡ã‚’ä½¿ã†ã¨ã€é…åˆ—å¼ã‚„æ–‡å—åˆ—ãªã©ã®åå¾©å¯èƒ½ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’ã€0 å€‹ä»¥ä¸Šã®å¼•æ•°ï¼ˆé–¢æ•°å‘¼ã³å‡ºã—ã®å ´åˆï¼‰ã‚„è¦ç´ ï¼ˆé…åˆ—ãƒªãƒ†ãƒ©ãƒ«ã®å ´åˆï¼‰ã‚’ç›®çš„ã®å ´æ‰€ã«å±•é–‹ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆãƒªãƒ†ãƒ©ãƒ«ã§ã¯ã€ã‚¹ãƒ—ãƒ¬ãƒƒãƒ‰æ§‹æ–‡ã«ã‚ˆã‚Šã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã®ãƒ—ãƒãƒ‘ãƒ†ã‚£ã‚’åˆ—æŒ™ã—ã€ä½œæˆã™ã‚‹ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã«ã‚ãƒ¼ã¨å€¤ã®çµ„ã‚’è¿½åŠ ã—ã¾ã™ã€‚ ã‚¹ãƒ—ãƒ¬ãƒƒãƒ‰æ§‹æ–‡ã¯ã€æ®‹ä½™æ§‹æ–‡ã¨ã¾ã£ãŸãåŒã˜ã‚ˆã†ã«è¦‹ãˆã¾ã™ãŒã€ã‚ã‚‹æ„å‘³ã§ã¯ã€ã‚¹ãƒ—ãƒ¬ãƒƒãƒ‰æ§‹æ–‡ã¯æ®‹ä½™æ§‹æ–‡ã®åå¯¾ã§ã™
seapig_dolphin 2017/05/21
ES2015

javascript
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JavaScript Key Code Event Tool | ToptalÂ®
KeyCode.Info allows users to press any key and instantly get the JavaScript Key or Key Code KeyboardEvent. Check out the Tool and Event List.
seapig_dolphin 2017/04/28
javascript

keyboard

keycode
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seapig_dolphin 2017/02/28
javascript

ES

es5

filter
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å…¨åŠ›ã§å¤§ãããªã‚‹Reactã®ã‚³ãƒ¼ãƒ‰ã‚’ã‚¹ã‚¿ã‚¤ãƒ«ã‚¬ã‚¤ãƒ‰ã«æ²¿ã£ã¦è¦‹ç›´ã—ãŸã‚‰ã€å¤§å¤‰å‹‰å¼·ã«ãªã‚Šã¾ã—ãŸ | Wantedly Engineer Blog
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seapig_dolphin 2016/08/17
react

JavaScript
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5 JavaScript â€œBadâ€ Parts That Are Fixed In ES6
ECMAScript 6 (ES6) features can be divided into features that are pure syntactic sugar (like: class), features that enhance JavaScript (like import) and features that fix some of JavaScriptâ€™s â€œbadâ€ parts (like the let keyword). Most blogs and articles combine all three types, and can overwhelm newcomers. So Iâ€™m writing this post that focuses on just the key ES6 features that fix â€œbadâ€ parts. I hop
seapig_dolphin 2016/05/15
JavaScript
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Google Tech Talks Web Exponents presented by Doug Crockford February 27, 2009 blog post: http://google-code-updates.blogspot.com/2009/03/doug-crockford-javascript-good-parts.html JavaScript is a language with more than its share of bad parts. It went from non-existence to global adoption in an alarmingly short period of time. It never had an interval in the lab when it could be tried out
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