border-box vs content-box (Box Model Made Simple)
Before mastering Flexbox or Grid, you must understand how CSS calculates size.
Use clamp() for Responsive Typography
clamp() lets text scale smoothly between a min and max size based on screen width—without media queries.
Narrow Types with Type Guards
Type guards tell TypeScript what the value really is.
Use unknown for External Data (APIs, JSON)
unknown is safer than any. It forces you to validate the type before using it.
Promise.all() vs Promise.allSettled()
Both methods run multiple promises in parallel, but they differ in how they handle errors. Choosing the right one prevents bugs and missing data in real-world apps.
Use Optional Chaining to Prevent Crashes
Optional chaining (?.) allows you to safely access nested object properties without throwing errors if any property in the chain is null or undefined. This eliminates the need for verbose null checks and prevents runtime crashes.
Nullish Coalescing for Better Defaults
The nullish coalescing operator (??) provides a fallback value only when the left side is null or undefined, unlike the logical OR (||) which treats all falsy values (0, '', false) as requiring the default.