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2018-10-17 : 19:35


Until recently, it was hard to write JavaScript that worked across all browsers.

The different JavaScript virtual machines found in each browser varied so much in their behavior that developers often put explicit checks in their code for each browser, and entire frameworks came and went that were devoted to allowing developers to write their code without these workarounds. These days, thanks to a massive investment in web standards, writing the same code and being able to run it in all major modern browsers has never been easier. Today on the web, we have more or less achieved uniformity across implementations in terms of the behavior of the JavaScript language, which is a huge win for developers and users. However, in terms of techniques for optimizing JavaScript performance, developers have had a harder time, which is where we still have some work to do.

Performance in JavaScript is a huge area of focus for browser implementers and developers alike. JavaScript is faster than ever, and performance work continues to deliver huge wins to end users and the web in general. There is still one question that remains unanswered: How can we decide which JavaScript to make fast? In other words, if developers want to improve the performance of their JavaScript, what sort of code should they write?

In the past, performance advice was often presented as anti-patterns, for example, “Don’t use for-each” or “Don’t use try-catch”. But developers want to use the latest and greatest features of their language. This leads to the same sort of special-casing that we saw 10 years ago, but for performance reasons instead of behavioral reasons. One place where we really see this ‘specialized’ code appear is in code written for Node.js.

Node.js is a server-side JavaScript runtime that has become extremely popular over the years. For much of its life, Node.js embedded the V8 engine as the only option to run JavaScript code. This meant that to squeeze the best performance out of their applications, developers often tailored their code to the specific version of V8 in a given release. This is not only true for applications written for Node.js, but for Node.js core itself, which implements a lot of the features of Node.js using JavaScript. This led to a lot of code being written and be heavily optimized to run on a previous generation of V8’s optimizing compiler, Crankshaft, to generate fast machine code on-the-fly.

Fast-forward to 2018 — Node.js can now also be powered by the ChakraCoreJavaScript engine and V8 has a new optimizing compiler Turbofan, both of which have a very different performance profile to Crankshaft. The problem for Node.js is that the codebase can sometimes lag behind the advancements in JavaScript compilers.


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