Code Splitting in Modern JavaScript Applications and Performance Implications

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Code splitting is a technique in modern JavaScript applications that optimizes performance by dividing the application into smaller bundles. This ensures that only the necessary code is loaded for a specific page, preventing unnecessary resources from being utilized. For instance, if the shopping cart functionality is not needed on the homepage, the related code is not loaded, which reduces initial load times and enhances user experience. Additionally, code splitting interacts effectively with lazy loading, enabling further optimization by only loading code as it is needed when a user navigates to different parts of the application.

Scott and Wes serve up a gameshow-style quiz with STUMP’d, challenging each other on web development trivia. From the differences between useMemo and useCallback to the intricacies of the JavaScript event loop, join them for a fun and informative session packed with web dev insights!

Show Notes

00:00 Welcome to Syntax!
01:17 Brought to you by Sentry.io.
02:03 The longest game of Rock, Paper, Scissors.
Round 1
03:22 In React, what is the difference between useMemo and useCallback hooks, and in what scenarios would you choose one over the other?
05:56 Explain the concept of “tree shaking” in modern JavaScript build tools. How does it work, and what are its benefits?
Round 2
09:11 In the context of CSS Grid, explain the difference between grid-template-areas and grid-area.
11:34 What is the “Temporal Dead Zone” in JavaScript, and how does it relate to variables declared with let and const
Round 3
13:29 Describe the inner workings of the JavaScript event loop, including the roles of the call stack, callback queue, and microtask queue.
17:10 What is the “Shadow DOM” in web components, and how does it differ from the regular DOM?
Round 4
20:05 Explain the process of Critical Rendering Path optimization in modern web browsers
26:14 Describe the purpose and functionality of the Intl.Segmenter API in JavaScript.
Round 5
30:03 Explain the concept of Web Assembly (WASM) and its role in modern web development.
32:11 Explain the concept of Svelte stores, particularly focusing on the differences between writable, readable, and derived stores.
Round 6
35:26 Explain the concept of “code splitting” in modern JavaScript applications.
37:00 Describe advanced techniques for maintaining an accessible focus order in web accessibility.
Round 7
45:15 Explain the concept of “Server-Sent Events” (SSE) in web development.
47:37 What’s the difference between contain layout and contain paint?
49:30 Sick Picks & Shameless Plugs.