Modern JavaScript (ES2024+): Modern Syntax, Async/Await & Event Loop

Por Elena Rostova • Beginner • 11 min read • Actualizado 2026-09-11

Lo Que Dominarás en Este Tutorial

Master safe property traversal with Optional Chaining and Nullish Coalescing.
Understand deep object cloning with native structuredClone().

1. Nullish Coalescing and Optional Chaining

Before ES2020, developers used logical OR for defaults. Modern JavaScript solves this with ?? and ?.

JAVASCRIPT

const apiResponse = { user: { profile: { points: 0 } } };
const score = apiResponse.user?.profile?.points ?? 100;
console.log(score); // 0 (correctly preserved)

Nota: Use ?? whenever 0 or false are valid domain values.

Evaluación Rápida: Pon a Prueba tus Conocimientos

1. What is the difference between || and ?? in JavaScript?

Preguntas Frecuentes

How do I deep clone an object without lodash?

Use structuredClone(obj), which is now natively supported across all modern runtimes.