WebAssembly browser preview · V8
Show navigation Today we’re happy to announce, in tandem with Firefox and Edge, a WebAssembly browser preview. WebAssembly or Wasm is a new runtime and compilation target for the web, designed by collaborators from Google, Mozilla, Microsoft, Apple, and the W3C WebAssembly Community Group. What does this milestone mark? #This milestone is significant because it marks: a release candidate for our M
RegExp lookbehind assertions · V8
Show navigation Introduced with the third edition of the ECMA-262 specification, regular expressions have been part of Javascript since 1999. In functionality and expressiveness, JavaScript’s implementation of regular expressions roughly mirrors that of other programming languages. One feature in JavaScript’s RegExp that is often overlooked, but can be quite useful at times, is lookahead assertion
V8 release v4.5 · V8
Roughly every six weeks, we create a new branch of V8 as part of our release process. Each version is branched from V8’s Git master immediately before Chrome branches for a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 4.5, which will be in beta until it is released in coordination with Chrome 45 Stable. V8 v4.5 is filled with all sorts of developer-facing go
V8 JavaScript engine
Show navigationWhat is V8?V8 is Google’s open source high-performance JavaScript and WebAssembly engine, written in C++. It is used in Chrome and in Node.js, among others. It implements ECMAScript and WebAssembly, and runs on Windows, macOS, and Linux systems that use x64, IA-32, or ARM processors. V8 can be embedded into any C++ application. Latest posts and feature explainersHow we made JSON.str
DailyJS: V8 Optimization Killers
Bluebird gets a lot of respect for its performance and API style, and reading Optimization killers on the Bluebird wiki reinforced my own inclination to use it over the dozens of other competent promise libraries. Dug up by diggan on Hacker News, this wiki page explores some ways seemingly innocent JavaScript can cause V8 to avoid optimisation. It contains a code sample that allows you to detect i
foræ–‡ã§ã®let変数ãŒæ¯Žãƒ«ãƒ¼ãƒ—新スコープをæŒã¤ã‚ˆã†ã«ãªã£ãŸ - JS.next
æ¦‚è¦ ã‹ã¤ã¦ã¯foræ–‡åˆæœŸåŒ–å¥ã§å®£è¨€ã•ã‚ŒãŸå¤‰æ•°ã¯ã€foræ–‡ã®ç›´å‰ã§å®£è¨€ã•ã‚ŒãŸã‚ˆã†ã«æŒ¯èˆžã£ã¦ã„ãŸãŒã€å„ループã§ã‚¹ã‚³ãƒ¼ãƒ—を引ãã¥ã‚‰ãªã„よã†ã«ä»•æ§˜ãŒå¤‰æ›´ã•ã‚Œã€V8も追従ã—ãŸã€‚ 例 for (let i = 0; i < 5; i++) { ～～～ } ã“ã‚Œã¯ä»Šã¾ã§ã¯æ¬¡ã®ã‚³ãƒ¼ãƒ‰ã¨ç‰ä¾¡ã ã£ãŸã€‚ { let i = 0 for (; i < 5; i++) { ～～～ } } ã¤ã¾ã‚Šforæ–‡ä¸ã§é–¢æ•°ã‚’定義ã™ã‚‹ã¨ã“ã†ãªã£ã¦ã„ãŸã€‚ let funs = [] for (let i = 0; i < 5; i++) { funs.push(function () { return i }) } funs.map(function (fun) { return fun() }) // [5,5,5,5,5] ã“ã®çµæžœãŒ[0,1,2,3,4]ã«ãªã‚‹ã®ãŒä»Šå›žã®å¤‰æ›´ã§ã‚る。 ã¤ã¾ã‚Šä¸€ç•ªæœ€åˆã®ã‚³ãƒ¼ãƒ‰ã¯ã“ã‚Œã¨ç‰ä¾¡ã«ãªã‚‹
Embedding V8 Javascript Engine and Go
This is two common examples merged together; how to run V8 as embedded and how to call C modules from Go language. I’m using Ubuntu 10.04 x64 with standard gcc toolchain. Step 1. Compile v8 Get v8 source and build v8 as shared library. Use this command line and copy libv8.so to to your project directory: $ scons mode=release library=shared snapshot=on arch=x64 $ cp libv8.so ~/v8example Step 2. C W
Promiseã«ã¤ã„㦠- JS.next
æ¦‚è¦ Promiseã¨ã¯éžåŒæœŸå‡¦ç†ã‚’上手ã扱ã†ç‚ºã®APIã§ã‚ã‚Šã€ãƒ‘ターンã§ã‚る。 éžåŒæœŸã®å‡¦ç†ã®å®Œäº†å¾Œã«ç¶šã‘ã¦å‡¦ç†ã‚’è¡Œã„ãŸã„ã¨ãã€ã‚ˆãコールãƒãƒƒã‚¯ãƒ‘ターンãŒä½¿ã‚れるãŒã€å‡¦ç†ãŒé€£ç¶šã™ã‚‹ã¨ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯åœ°ç„ã¨è¨€ã‚れる分ã‹ã‚Šã¥ã‚‰ã„ソースコードã«ãªã£ã¦ã—ã¾ã†ã€‚ ã¾ãŸã€è¤‡æ•°ã®éžåŒæœŸå‡¦ç†ãŒå®Œäº†ã—ãŸæ™‚ã«å‡¦ç†ã‚’è¡Œã†ãªã©ã€ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯ãƒ‘ターンã§ã¯é›£ã—ã„事をスマートã«ã§ãã‚‹ã®ãŒã“ã®Promiseã§ã‚る。 今ã¾ã§ã¯DOMã®æ–¹ã§DOM Promiseã¨ã—ã¦ä»•æ§˜ç–定ãŒé€²ã‚られã¦ã„ãŸã‚Šã€ãƒ©ã‚¤ãƒ–ラリã®DeferredãŒæœ‰åã ã£ãŸãŒã€ES2015標準ã«å…¥ã‚‹ã“ã¨ã«ãªã‚Šã€V8ã«å®Ÿè£…ã•ã‚ŒãŸã€‚ 実装ã•ã‚ŒãŸãƒ¡ã‚½ãƒƒãƒ‰ Promise.resolve(x) Promise.reject(x) Promise.all( [p1, p2, p3, ......] ) Promise.race( [p1, p2, p3, ......] )
generators in v8 — wingolog
Hey y'all, ES6 generators have landed in V8! Excellent! Many of you know what that means already, but for those of you that don't, a little story. A few months ago I was talking with Andrew Paprocki over at Bloomberg. They use JavaScript in all kinds of ways over there, and as is usually the case in JS, it often involves communicating with remote machines. This happens on the server side and on th
V8 javascript VM and Node.js memory management options | O sNAp
Memory management behavior is one of the first topics I wanted to understand in node. This will be part one of two articles in which I intend to explore: Memory management / gc options in the V8 VM that runs node.js applications. Debugging / memory leak analysis for running node servers. At a high level V8 uses a generational memory model with a copy collector and incremental mark and sweep. You
Performance Tips for JavaScript in V8 - HTML5 Rocks
Introduction Daniel Clifford gave an excellent talk at Google I/O on tips and tricks to improve JavaScript performance in V8. Daniel encouraged us to "demand faster" - to carefully analyze performance differences between C++ and JavaScript, and write code mindfully of how JavaScript works. A summary of the most important points of Daniel's talk are captured in this article, and we'll also keep thi
Welcome to V8 Crankshaft Internals’s documentation! — V8 Crankshaft Overview 1.3 documentation
V8 Crankshaft Overview 1.3 documentation Welcome to V8 Crankshaft Internals’s documentation!
V8エンジンã®ä»•æ§˜ã£ã¦ï¼Ÿï¼Ÿ - 燃やã—ãŸãŒã‚‹å…ˆè¼©ã®å¾Œè¼©
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r24291 - v8 — ES6: Implement object literal property shorthand
You can find more information on our Wiki at http://www.v8project.org
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GitHub - ry/v8worker: Minimal golang binding to V8
https://mkw.st/p/gdd11-berlin-v8-performance-tuning-tricks/
Google Code Archive - Long-term storage for Google Code Project Hosting.
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