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JavaScript is now equipped with a new regular expression enhancement!
@MayaLekova shows how it can be used for finding positions of matched groups. https://v8.dev/features/regexp-match-indices … (This feature is available starting from V8 v7.9 behind a --harmony-regexp-match-indices flag.)pic.twitter.com/dYSYkZwSkF
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Top-level await makes it possible to use the `await` keyword outside of async functions in JavaScript modules!
@mylesborins explains: https://v8.dev/features/top-level-await …pic.twitter.com/kB7u7ZFGiq
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Let's [not] keep you in the dark anymore... Introducing dark mode for http://v8.dev ! By default we're going to display the blog according to your system theme, but feel free to override the preference using a toggle in the footer. (h/t
@tomayac)pic.twitter.com/67rH8su3yU
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Regular expressions just got faster *and* more memory-efficient in V8: https://v8.dev/blog/regexp-tier-up …pic.twitter.com/tWNK7YQr3t
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Nullish coalescing syntax is coming to JavaScript!
This feature enables safer default expressions. https://v8.dev/features/nullish-coalescing …pic.twitter.com/AoK4Bo31eJ
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Same great V8 t̵a̵s̵t̵e performance
, now with 20% less s̵u̵g̵a̵r memory overhead
. https://v8.dev/blog/v8-lite pic.twitter.com/8bngBnhL0x
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Recently, React core hit a scary V8 performance cliff.
Here’s a technical deep dive explaining what happened behind the scenes in V8, and how we fixed it!
https://v8.dev/blog/react-cliff …pic.twitter.com/iq4CVCKRLF
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Optional chaining syntax is coming to JavaScript!
This feature enables readable and concise expression of property accesses with built-in nullish checking. @MayaLekova explains: https://v8.dev/features/optional-chaining …pic.twitter.com/ycjzZAB4S6
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Weak references and finalizers are (finally) coming to JavaScript!
@_gsathya and@mathias explain: https://v8.dev/features/weak-references …pic.twitter.com/vk6AnLlF0J
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The dominant costs of processing JavaScript are:
download
CPU execution time
@addyosmani on the cost of JavaScript in 2019: https://v8.dev/blog/cost-of-javascript-2019 …pic.twitter.com/6uF8Nmjz62
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What’s new in JavaScript and @v8js? Check out@mathias and@_gsathya’s#io19 presentation to find out! https://www.youtube.com/watch?v=c0oy0vQKEZE …pic.twitter.com/VhUkIEmHFB
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The JavaScript Internationalization API is growing, and its V8 implementation is getting faster!
@_gsathya explains the recent improvements: https://v8.dev/blog/intl pic.twitter.com/fBSvfnS2YO
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@v8js presentations at#io19
@_gsathya and@mathias talk about modern JavaScript features and optimizations: https://events.google.com/io/schedule/events/6025078c-dccb-4ffe-b250-610670182c71 …
@dptig and@DasSurma cover what you can create with WebAssembly: https://events.google.com/io/schedule/events/faf395cf-4c2e-4b8e-8e43-b8eb5a16c103 … Watch this space for livestream links.pic.twitter.com/Yj2ZWTsMGt
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As it turns out, NOT parsing is faster than parsing.
That’s why JavaScript engines implement a preparser which enables lazy parsing and compilation. Here’s how that works in V8: https://v8.dev/blog/preparser pic.twitter.com/HRB3CEGDfJ
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WasmBoy is a Game Boy Emulation Library for running ROMs in browsers and in Node.js, written in AssemblyScript. In this presentation,
@torch2424 explains why WebAssembly’s predictable performance is the perfect fit for WasmBoy:https://www.youtube.com/watch?v=ZlL1nduatZQ … -
(Byte)code caching reduces the start-up time of commonly visited websites by caching the result of JavaScript parsing + compilation.
How can JavaScript developers get the most out of @v8js code caching in@ChromiumDev?@leszekswirski explains: https://v8.dev/blog/code-caching-for-devs …pic.twitter.com/vYVIPR6XmF
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The cornerstone of parser performance is a fast scanner. @tverwaes explains how V8’s JavaScript scanner got up to 2.1× faster: https://v8.dev/blog/scanner pic.twitter.com/n35oVWWcpU
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What’s new in V8 v7.4? Wasm threads/Atomics, private class fields, performance and memory improvements, and much more! https://v8.dev/blog/v8-release-74 …pic.twitter.com/uMKCWTlHso
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V8 v7.4 supports a JIT-less or “interpreter-only” mode, where JavaScript executes without allocating executable memory at runtime. https://v8.dev/blog/jitless pic.twitter.com/HfFaqM4DGO
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What’s new in V8 v7.3? Wasm and async performance improvements, async stack traces, Object.fromEntries, String#matchAll, and much more! https://v8.dev/blog/v8-release-73 …pic.twitter.com/ZK3j9WhEfN
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