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globalThis polyfill in universal JavaScriptPublished · tagged with JavaScript
The globalThis proposal introduces a unified mechanism to access the so-called “global object” a.k.a. “the global” in any JavaScript environment. It sounds like a simple thing to polyfill, but it turns out it’s pretty hard to get right.
Continue reading “A horrifying globalThis polyfill in universal JavaScript”…
Published · tagged with JavaScript, performance
This article explains JavaScript engine optimization pipeline trade-offs, and describes how engines such as V8 speed up accesses to prototype properties. As a JavaScript developer, having a deeper understanding of how JavaScript engines work helps you reason about the performance characteristics of your code.
Continue reading “JavaScript engine fundamentals: optimizing prototypes”…
Published · tagged with JavaScript, performance
This article describes some key fundamentals that are common to all JavaScript engines — and not just V8, the engine the authors work on. As a JavaScript developer, having a deeper understanding of how JavaScript engines work helps you reason about the performance characteristics of your code.
Continue reading “JavaScript engine fundamentals: Shapes and Inline Caches”…
await beats Promise#then()Published · tagged with JavaScript, performance
Compared to using promises directly, not only can async and await make code more readable for developers — they enable some interesting optimizations in JavaScript engines, too! This write-up is about one such optimization involving stack traces for asynchronous code.
Continue reading “Asynchronous stack traces: why await beats Promise#then()”…
Published · tagged with JavaScript, Unicode
This article highlights what’s happening in the world of JavaScript regular expressions right now. Spoiler: it’s quite a lot — there are more RegExp-related proposals currently advancing through the TC39 standardization process than there have been updates to RegExp in the history of ECMAScript!
Continue reading “ECMAScript regular expressions are getting better!”…