The V8 JavaScript Engine is an open sourceJavaScript engine developed by The Chromium Project for the Google Chrome web browser.[4] It has since seen use in many other projects, such as Node.js and MongoDB. As of 2012, the head programmer is Lars Bak.[5] The first version of the V8 engine was released at the same time as the first version of Chrome, September 2, 2008.
V8 compilesJavaScript to native machine code (IA-32, x86-64, ARM, PowerPC, IBM s390 or MIPSISAs)[3][6] before executing it, instead of more traditional techniques such as interpreting bytecode or compiling the whole program to machine code and executing it from a filesystem. The compiled code is additionally optimized (and re-optimized) dynamically at runtime, based on heuristics of the code's execution profile. Optimization techniques used include inlining, elision of expensive runtime properties, and inline caching, among many others.
V8 is intended to be used both in a browser (notably in Chrome and Chromium browsers) and as a standalone high-performance engine that can be integrated into independent projects, for example server-side JavaScript in Node.js,[10] or client side JavaScript in .NET/Mono using V8.NET.
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