In previous parts of this series, we were discussing the internals of ES6 collections and arrays in V8. This time we will cover a simpler topic which is Math.random() function. Every JS developer uses Math.random() once in a while in their applications for various use cases. The general wisdom says…

In the previous part of this series, we were discussing Map and Set, standard collections introduced in ES6. This time we will focus on JavaScript arrays. Arrays, which are essentially list-like objects, are one of the core features of the language and every JavaScript developer has a solid experience in…

Note: this post was originally published in Hazelcast blog. As you may already know, the Hazelcast In-Memory Data Grid (IMDG) ecosystem includes a variety of clients for different languages and runtimes, which includes Node.js client library as a part of that list. You can use Hazelcast clients in various cases…

The common wisdom says that K/V stores are a bad fit for time series (TS) data. Reasons are lots of writes and a large data volume implied by time series. But the common wisdom maybe sometimes wrong. Today we will discuss an approach for building a (relatively) efficient TS storage…

With this blog post, I am starting V8 Deep Dives series dedicated to my experiments and findings in V8, which is, no doubt, a well-engineered and sophisticated software. Hopefully, you will find this blog post valuable and share your ideas for the next topic. Intro ECMAScript 2015, also known as ES6…

Node.js v13.10.0 introduced a built-in CLS API, namely, new class AsyncLocalStorage located in the well-known experimental async_hooks module. In this short post I’ll try to explain why it is so important. CLS API 101 CLS stands for Continuation-Local Storage, an async variation of the Thread-Local Storage concept from the multithreaded world. CLS APIs…

Everybody knows that Node.js is an open-source, cross-platform JavaScript runtime. Most of Node.js developers know that it’s built on top of V8, a JS engine, and libuv, a multi-platform C library that provides support for asynchronous I/O based on event loops. But only few developers can clearly explain how Node.js…

Recently I wrote a post about request id tracing in Node.js apps. The proposed solution was built around cls-hooked library, which in its turn uses node’s built-in Async Hooks API. So, I decided to get more familiar with async hooks. …

If you ever wrote back-end applications in Node.js, you know that tracing the same HTTP request through log entries is a problem. Usually your logs look something like this: [07/Nov/2018:15:48:11 +0000] User sign-up: starting request validation [07/Nov/2018:15:48:11 +0000] User sign-up: starting request validation [07/Nov/2018:15:48:12 +0000] User sign-up: request validation success …