Introducing the WebAssembly JavaScript Promise Integration API · V8
The JavaScript Promise Integration (JSPI) API allows WebAssembly applications that were written assuming that access to external functionality was synchronous to operate smoothly in an environment where much of the desired functionality is asynchronous. This note outlines what the core capabilities of the JSPI API are, how to access it, how to develop software for it and offers some examples to tr
V8 release v9.1 · V8
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 a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 9.1, which is in beta until its release in coordination with Chrome 91 Stable in several weeks. V8 v9.1 is filled with all sorts of developer-facing goodies. This post pr
String.prototype.replaceAll · V8
Show navigation If you’ve ever dealt with strings in JavaScript, chances are you came across the String#replace method. String.prototype.replace(searchValue, replacement) returns a string with some matches replaced, based on the parameters you specify: 'abc'.replace('b', '_'); // → 'a_c' '🍏🍋🍊🍓'.replace('🍏', '🥭'); // → '🥭🍋🍊🍓'A common use case is replacing all instances of a given substrin
The cost of JavaScript in 2019 · V8
Show navigation Note: If you prefer watching a presentation over reading articles, then enjoy the video below! If not, skip the video and read on. “The cost of JavaScript” as presented by Addy Osmani at #PerfMatters Conference 2019.One large change to the cost of JavaScript over the last few years has been an improvement in how fast browsers can parse and compile script. In 2019, the dominant cost
V8 release v7.6 · V8
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 a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 7.6, which is in beta until its release in coordination with Chrome 76 Stable in several weeks. V8 v7.6 is filled with all sorts of developer-facing goodies. This post pr
Faster async functions and promises · V8
Show navigation Asynchronous processing in JavaScript traditionally had a reputation for not being particularly fast. To make matters worse, debugging live JavaScript applications — in particular Node.js servers — is no easy task, especially when it comes to async programming. Luckily the times, they are a-changin’. This article explores how we optimized async functions and promises in V8 (and to
BigInt: arbitrary-precision integers in JavaScript · V8
Show navigation BigInts are a new numeric primitive in JavaScript that can represent integers with arbitrary precision. With BigInts, you can safely store and operate on large integers even beyond the safe integer limit for Numbers. This article walks through some use cases and explains the new functionality in Chrome 67 by comparing BigInts to Numbers in JavaScript. Use cases #Arbitrary-precision
Background compilation · V8
TL;DR: Starting with Chrome 66, V8 compiles JavaScript source code on a background thread, reducing the amount of time spent compiling on the main thread by between 5% to 20% on typical websites. Background #Since version 41, Chrome has supported parsing of JavaScript source files on a background thread via V8’s StreamedSource API. This enables V8 to start parsing JavaScript source code as soon as
V8 release v6.5 · V8
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 a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 6.5, which is in beta until its release in coordination with Chrome 65 Stable in several weeks. V8 v6.5 is filled with all sorts of developer-facing goodies. This post pr
Fast for-in in V8 · V8
for-in is a widely used language feature present in many frameworks. Despite its ubiquity, it is one of the more obscure language constructs from an implementation perspective. V8 went to great lengths to make this feature as fast as possible. Over the course of the past year, for-in became fully spec-compliant and up to 3 times faster, depending on the context. Many popular websites rely heavily
Optimizing ES2015 proxies in V8 · V8
Show navigation Proxies have been an integral part of JavaScript since ES2015. They allow intercepting fundamental operations on objects and customizing their behavior. Proxies form a core part of projects like jsdom and the Comlink RPC library. Recently, we put a lot of effort into improving the performance of proxies in V8. This article sheds some light on general performance improvement pattern
High-performance ES2015 and beyond · V8
Show navigation Over the last couple of months the V8 team focused on bringing the performance of newly added ES2015 and other even more recent JavaScript features on par with their transpiled ES5 counterparts. Motivation #Before we go into the details of the various improvements, we should first consider why performance of ES2015+ features matter despite the widespread usage of Babel in modern we
Experimental support for WebAssembly in V8 · V8
Show navigation For a comprehensive overview of WebAssembly and a roadmap for future community collaboration, see A WebAssembly Milestone on the Mozilla Hacks blog. Since June 2015, collaborators from Google, Mozilla, Microsoft, Apple and the W3C WebAssembly Community Group have been hard at work designing, specifying, and implementing (1, 2, 3, 4) WebAssembly, a new runtime and compilation target
V8 release v4.9 · 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 4.9, which will be in beta until it is released in coordination with Chrome 49 Stable. V8 4.9 is filled with all sorts of developer-facing goo
There’s Math.random(), and then there’s Math.random() · V8
Show navigation Math.random() returns a Number value with positive sign, greater than or equal to 0 but less than 1, chosen randomly or pseudo-randomly with approximately uniform distribution over that range, using an implementation-dependent algorithm or strategy. This function takes no arguments. — ES 2015, section 20.2.2.27 Math.random() is the most well-known and frequently-used source of rand
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