The Top Modern JavaScript Features You Should Know in 2024

Explore the essential modern JavaScript features of 2024, from ES6+ updates to async/await and modules, to enhance your coding skills.

Modern JavaScript has evolved significantly with the introduction of various concepts that make the language more powerful, efficient, and easier to use.

Optional Chaining (?.)

Safely access deeply nested properties without worring about undefined or null

const user = {};
console.log(user?.profile?.name); // undefined, no error

Nullish Coalescing (??)

Provides a fallback only for null or undefined, unlinke ||, which treats falsy values like 0 or "" as false.

const name = user.name ?? 'Guest';
console.log(name); // Guest

BigInt

A data type in JavaScript used to represent integers larger than the safe integer limit of the Number type. The Number type in JavaScript can only safely represent integers between ±2^53-1, but BigInt allows for handling much larger (or smaller) integers.

const x = 1234567890123456789n;