Frontend Almanac
Author’s blog by Roman Maksimov. Web developer since 2006. Frontend expert, researcher and mentor.
21 posts

React. Nodes update and memoization

In this article, we will delve "under the hood" of the React engine and see how node updates occur. At the same time, we will also explore the basic principles of memoization and its application in different types of components.

JavaScript Optimisation. Inline Caches

I think it is not a secret for anyone that all popular JavaScript engines have a similar code execution pipeline. It looks something like this. The interpreter quickly compiles JavaScript code into bytecode "on the fly". The resulting bytecode starts executing and is processed in parallel by the optimizer. The optimizer needs time for this processing, but in the end, highly optimized code can be obtained, which will work much faster. In the V8 engine, Ignition acts as the interpreter, and Turbofan acts as the optimizer. In the Chakra engine, which is used in Edge, instead of one optimizer, there are two - SimpleJIT and FullJIT. In JSC (Safari), there are three Baseline, DFG, and FTL optimizers. The specific implementation may...

Object Structure in JavaScript Engines

From a developer's perspective, objects in JavaScript are quite flexible and understandable. We can add, remove, and modify object properties on our own. However, few people think about how objects are stored in memory and processed by JS engines. Can a developer's actions, directly or indirectly, impact performance and memory consumption? Let's try to delve into all of this in this article.

State management in React applications

The issue of state management in React applications has always been very relevant. React itself, when it first came out, did not offer any comprehensive approaches to state management and left this task to the developers. The technical tools available were the classic component properties and the internal state of components. The standard basic concept was extremely primitive and involved storing data in the component's state. Thus, global data could be stored in the state of the top component, while more specific data could be stored in the states of lower components. The only built-in way to exchange data between components was to use component properties.

Garbage Collection in V8

In this article, we will delve into the process of garbage collection by the V8 engine in detail. We will familiarize ourselves with the concepts of generations, Minor and Major Garbage Collections, see how objects are allocated, traced, and marked in memory. We will also explore what happens to empty spaces after cleaning and how garbage collection is performed in the background.

Chromium. Web page rendering using Blink, CC and scheduler

The Chromium engine from Google consists of a vast number of internal mechanisms, subsystems, and other engines. In this article, we will delve into the process of composing and rendering web pages directly on the screen, as well as get a little closer acquainted with the Blink engine, the composer (or, as it is also called, the content collator), and the task scheduler.

Iterators in JavaScript

In this article, we will look at the mechanism of iterators. What they are, how to apply them and how to create your own.

Events in HTML explained

In this article, we will thoroughly explore working with events, including their dispatching, capturing, bubbling and termination. Especially for this article, I have created a small interactive demo script that vividly illustrates all the phases of an event. The script will be published at the end of the article.

Strict Mode in ECMAScript. Complete guide

There is a lot of information about the strict mode. However, there are very few articles covering the full range of features of the strict mode. Therefore, I have decided to compile my own guide of all restrictions, exceptions, and differences in the execution of "strict" code from "non-strict", in full compliance with the ECMA-262 specification.

Event Loop. Myths and reality

There are numerous publications on the web about the Event Loop and how it works, and new articles continue to appear on popular resources to this day. Unfortunately, not all the information provided in these materials is verified or reliable. As a result, the concept itself has become surrounded by a number of myths and speculations. Sometimes, even experienced developers require a great deal of attention and experience to discern the truth from pure fiction. In this article, let's attempt to determine where the truth lies.