8 Exciting New JavaScript Concepts You Need to Know

As a developer, staying up-to-date with the latest advancements in JavaScript is crucial to writing efficient, modern, and scalable code. In this post, we’ll explore 8 new and exciting JavaScript concepts that you should know to take your coding skills to the next level.

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1. Optional Chaining (?.)

Introduced in ECMAScript 2020, optional chaining allows you to read the value of a property located deep within a chain of connected objects without having to check that each reference in the chain is valid.

let name = person?.address?.street?.name;

2. Nullish Coalescing (??)

Also introduced in ECMAScript 2020, the nullish coalescing operator returns the first operand if it’s not null or undefined, and the second operand otherwise.

let name = person?.name?? 'Unknown';

3. BigInt

A new numeric primitive in JavaScript, BigInt is used to represent integers with arbitrary precision, allowing for accurate calculations with large integers.

const x = 12345678901234567890n;

4. globalThis

A new global object, globalThis, provides a way to access the global object in a way that’s compatible with modern JavaScript environments.

console.log(globalThis === window); // true in a browser

5. matchAll()

A new method on the String prototype, matchAll() returns an iterator that yields matches of a regular expression against a string, including capturing groups.

const regex = /(\w)(\d)/g;
const str = 'a1b2c3';
for (const match of str.matchAll(regex)) { console.log(match);
}

6. Promise.allSettled()

A new method on the Promise API, allSettled() returns a promise that is resolved when all of the promises in an array are either resolved or rejected.

const promises = [Promise.resolve('a'), Promise.reject('b'), Promise.resolve('c')];
Promise.allSettled(promises).then((results) => console.log(results));

7. String.prototype.at()

A new method on the String prototype, at() returns the character at the specified index, allowing for negative indices to access characters from the end of the string.

const str = 'hello';
console.log(str.at(0)); // 'h'
console.log(str.at(-1)); // 'o'

8. Error Cause

A new property on Error objects, cause allows you to specify the underlying cause of an error.

try { throw new Error('Error occurred', { cause: new Error('Underlying cause') });
} catch (error) { console.log(error.cause);
}

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