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JavaScript ã® Module Fragments ã«ã¤ã„ã¦
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mizdra 2021/02/28
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Microsoftã€çµ„ã¿è¾¼ã¿ãƒ‡ãƒã‚¤ã‚¹ã‚’ã‚¿ãƒ¼ã‚²ãƒƒãƒˆã¨ã—ãŸTypeScriptã®é«˜é€Ÿã‚µãƒ–ã‚»ãƒƒãƒˆâ€Static TypeScriptâ€ã‚’ç™ºè¡¨
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mizdra 2019/11/08
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ãã‚ãã‚JavaScriptã«æŽ¡ç”¨ã•ã‚Œãã†ãªOptional Chainingã‚’ä»Šã•ã‚‰å¾¹åº•è§£èª¬ - Qiita
ã¿ãªã•ã‚“ã€Optional Chainingä½¿ã£ã¦ã¾ã™ã‹ï¼Ÿã€€ç§ã¯å…ˆæ—¥å‡ºãŸTypeScript 3.7 Betaã‚’å°ã•ã„ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã«å°Žå…¥ã—ã¦ä½¿ã£ã¦ã¿ã¾ã—ãŸã€‚ã“ã‚Œã¯ã¨ã¦ã‚‚å¿«é©ã§ã™ãã€‚ ä¾‹ã«ã‚ˆã£ã¦ã€Optional Chainingã¯ECMAScriptã«å¯¾ã™ã‚‹ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ã®ä¸€ã¤ã§ã™ã€‚ã¤ã¾ã‚Šã€ã‚‚ã†ã™ãå…¥ã‚Šãã†ãªJavaScriptã®æ–°æ©Ÿèƒ½ã§ã™ã€‚ãƒ—ãƒãƒãƒ¼ã‚¶ãƒ«ã¯ãŸãã•ã‚“ã®ç¨®é¡žãŒã‚ã‚Šã¾ã™ãŒã€ãã®ä¸ã§ã‚‚Optional Chainingã¯ãã®é«˜ã„æœ‰ç”¨æ€§ã‹ã‚‰ã“ã‚Œã¾ã§å¤šãã®æ³¨ç›®ã‚’é›†ã‚ã¦ãã¾ã—ãŸã€‚Optional Chainingã¯2019å¹´6æœˆã®TC39ãƒŸãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã§Stage 3ã«ä¸Šæ˜‡ã—ã€ã„ã‚ˆã„ã‚ˆæ£å¼æŽ¡ç”¨ãŒè¿‘ãæœŸå¾…ã‚‚é«˜ã¾ã£ã¦ããŸã¨ã“ã‚ã§ã™ã€‚TypeScript 3.7ã«ã‚‚å°Žå…¥ã•ã‚ŒãŸãŸã‚ã€TypeScriptãƒ¦ãƒ¼ã‚¶ãƒ¼ã®æ–¹ã€…ã¯11æœˆä¸Šæ—¬ã«æ£å¼ãƒªãƒªãƒ¼ã‚¹ãŒäºˆå®šã•ã‚Œã¦ã„ã‚‹TypeScript 3.7ã‚’ä»Šã‹ä»Šã‹ã¨å¾…
mizdra 2019/11/07
javascript

typescript

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Nullish Coalescing ã¨ Optional Chaining | blog.jxck.io
Intro JS ã«ãŠã‘ã‚‹ null/undefined ã®æ‰±ã„æ”¹å–„ã™ã‚‹ãŸã‚ã® 2 ã¤ã®æ©Ÿèƒ½ãŒææ¡ˆã•ã‚Œã¦ã„ã‚‹ã€‚ Nullish Coalescing Operator (stage 3) Optional Chaining Operator (stage 3) ã„ãšã‚Œã‚‚ Stage 3 ã«é€²ã¿ã€å®Ÿè£…ã‚‚å§‹ã¾ã£ã¦ã„ã‚‹ã®ã§ã€ç¾æ™‚ç‚¹ã§ã®è§£èª¬ã‚’è¡Œã†ã€‚ Nullish Coalescing å¯¾è±¡ãŒ null/undefined ã ã£ãŸå ´åˆã«ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã‚’è¿”ã—ãŸã„ã¨ã„ã£ãŸå ´åˆã‚’è€ƒãˆã‚‹ã€‚ function main(option) { option.param = option.param || 'default' } main({param : 'hello'}) ã—ã‹ã—ã€ã“ã®å ´åˆã¯ null/undefined ä»¥å¤–ã«ã‚‚ param ãŒ 0, false, '' ãªã© falsy ãªå€¤ã®å ´åˆã‚‚ä¸Šæ›¸ãã•
mizdra 2019/08/16
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Private Class Field ã®å°Žå…¥ã«ä¼´ã† JS ã®æ§‹æ–‡æ‹¡å¼µ | blog.jxck.io
Intro ECMAScript ã® Private Class Field ã®ä»•æ§˜ç–å®šã¨å„ãƒ–ãƒ©ã‚¦ã‚¶ã®å®Ÿè£…ãŒé€²ã‚“ã§ã„ã‚‹ã€‚ ã“ã‚Œã«ã‚ˆã‚Šã€å¾“æ¥ã® JS ã«ã¯ãªã‹ã£ãŸ Class ã® Private ãƒ•ã‚£ãƒ¼ãƒ«ãƒ‰ãŒä½¿ãˆã‚‹ã‚ˆã†ã«ãªã‚‹ã€‚ ææ¡ˆã•ã‚Œã¦ã„ã‚‹æ§‹æ–‡ã‚„ã€æŒ™å‹•ã«ã¤ã„ã¦è§£èª¬ã™ã‚‹ã€‚ Class Field Declaration ã¾ãšå‰æã¨ã—ã¦ã€ç¾çŠ¶ã® Class ã® ãƒ•ã‚£ãƒ¼ãƒ«ãƒ‰ã¯ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã§å®šç¾©ã™ã‚‹å¿…è¦ãŒã‚ã‚‹ã€‚ ä¾‹ãˆã° count ãƒ•ã‚£ãƒ¼ãƒ«ãƒ‰ã‚’æŒã¤ Counter ã‚¯ãƒ©ã‚¹ã‚’å®šç¾©ã—ãŸå ´åˆã€ä»¥ä¸‹ã®ã‚ˆã†ã«ãªã‚‹ã€‚ class Counter { constructor() { this.count = 0 } increment() { this.count ++ } display() { console.log(this.count) } } const c = new Counter() c.in
mizdra 2019/03/14
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TypeScriptã®åž‹æƒ…å ±ã‚’åˆ©ç”¨ã—ãŸCustom Transformerã®ç¾çŠ¶ç¢ºèª - Islands in the byte stream
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mizdra 2019/03/06
typescript

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ECMAScriptã®æµ®å‹•å°æ•°ç‚¹æ•°ã®ä¸¸ã‚ä»•æ§˜ãŒã‚¹ã‚´ã„ - hnwã®æ—¥è¨˜
ECMAScriptã®æµ®å‹•å°æ•°ç‚¹æ•°ã®ä¸¸ã‚é–¢æ•°ã§ã‚ã‚‹ Number.prototype.toFixed() ã«ã¤ã„ã¦èª¿ã¹ã¦ã¿ãŸã¨ã“ã‚ã€æµ®å‹•å°æ•°ç‚¹æ•°ã‚’ã‚ã‹ã£ã¦ã„ã‚‹äººãŒä½œã£ãŸç¡¬æ´¾ãªä»•æ§˜ã ã¨æ„Ÿã˜ãŸã®ã§ã€è§£èª¬ã—ã¦ã¿ã¾ã™ã€‚ æµ®å‹•å°æ•°ç‚¹æ•°ã®ä¸¸ã‚ã®å–„ã—æ‚ªã—ã«ã¤ã„ã¦ ç§ã¯ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã®æµ®å‹•å°æ•°ç‚¹æ•°ã®ä¸¸ã‚å‡¦ç†ã«èˆˆå‘³ãŒã‚ã‚Šã€éŽåŽ»ã«é–¢é€£è¨˜äº‹ã‚’30æœ¬ä»¥ä¸Šæ›¸ã„ã¦ã„ã¾ã™ã€‚ã“ã†ã—ãŸæ´»å‹•ã‹ã‚‰å¾—ã‚‰ã‚ŒãŸçŸ¥è¦‹ã¨ã—ã¦ã€è‰¯ã„ä¸¸ã‚é–¢æ•°ã«ã¯æ¬¡ã®ã‚ˆã†ãªæ€§è³ªãŒã‚ã‚‹ã¨è€ƒãˆã¦ã„ã¾ã™ã€‚ ä»•æ§˜ãŒã‚·ãƒ³ãƒ—ãƒ«ã§ç›´æ„Ÿçš„ã§ã‚ã‚‹ã“ã¨ ä»•æ§˜ãŒæŠœã‘æ¼ã‚Œãªãæ–‡æ›¸åŒ–ã•ã‚Œã¦ã„ã‚‹ã“ã¨ ãƒã‚°ã‚’ä½œã‚Šè¾¼ã¿ã«ãã„ä»•æ§˜ã§ã‚ã‚‹ã“ã¨ ã©ã‚Œã‚‚è‰¯ã„é–¢æ•°ã®ä¸€èˆ¬è«–ã®ã‚ˆã†ãªè©±ã§ã™ãŒã€ä¸¸ã‚å‡¦ç†ã«é™ã£ã¦è¨€ãˆã°ç°¡å˜ãªè©±ã§ã¯ã‚ã‚Šã¾ã›ã‚“ã€‚ãã‚‚ãã‚‚æµ®å‹•å°æ•°ç‚¹æ•°ã®æ€§è³ªãŒäººã®ç›´æ„Ÿã«åã™ã‚‹ãŸã‚åˆ©ç”¨è€…ã«ã¨ã£ã¦ã‚‚å®Ÿè£…è€…ã«ã¨ã£ã¦ã‚‚ç½ ãŒå¤šãã€çµæžœã¨ã—ã¦ä¸Šã®æ¡ä»¶ã‚’æº€ãŸã›ãªã„ã“ã¨ãŒå¤šã„ã®ã§ã™ï¼ˆç§ãŒé¢ç™½ã„ã¨æ„Ÿã˜ã‚‹ãƒã‚¤ãƒ³ãƒˆ
mizdra 2019/02/28
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ã‚¤ãƒžãƒ‰ã‚ã¨è¨€ã‚ã‚Œã‚‹è¨€èªžæ©Ÿèƒ½ã«ã¤ã„ã¦ | Îºeenã®Happy HacÎºing Blog
# ã‚¤ãƒžãƒ‰ã‚ã¨è¨€ã‚ã‚Œã‚‹è¨€èªžæ©Ÿèƒ½ã«ã¤ã„ã¦ ---------------------- [ç¬¬60å›žãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚·ãƒ³ãƒã‚¸ã‚¦ãƒ ](http://www.ipsj.or.jp/prosym/60/60program.html) === # About Me --------- ![Îºeenã®ã‚¢ã‚¤ã‚³ãƒ³](/images/kappa.png) * Îºeen * [@blackenedgold](https://twitter.com/blackenedgold) * Github: [KeenS](https://github.com/KeenS) * [Idein Inc.](https://idein.jp/)ã®ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ + æƒ…å ±ç§‘å¦ã®æ•™è‚²ã¯å—ã‘ã¦ã„ãªã„ç´”ç²‹ãªã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ * å®Ÿéš›ã«ä»•äº‹ã§ä½¿ã£ãŸ(ã¦ã„ã‚‹)ã®ã¯Java, Scala, Rust === # æœ€è¿‘ã£ã½ã„è¨€èªž ------------
mizdra 2019/01/14
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rust

scala

go

javascript
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Jason Williams - Building a JS Interpreter in Rust Part 1
Dec 4, 2018 So Iâ€™ve decided to have a go at building a JS interpreter in Rust. Iâ€™ve wanted to do this for a while for a couple of reasons: Learn Rust Learn more about how JS implementations work Learn more about the JS specification There isnâ€™t a fully fledged compiler in Rust yet for JS Itâ€™s fun! The interpreter itself is called Boa and you can join me on every step of the way on this too. First
mizdra 2018/12/27
rust

javascript

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BNF for EcmaScript.jj
( <DECIMAL_LITERAL> | <HEX_INTEGER_LITERAL> | <STRING_LITERAL> | <BOOLEAN_LITERAL> | <NULL_LITERAL> | <REGULAR_EXPRESSION_LITERAL> )
mizdra 2018/12/10
javascript

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