Nullish Coalescing and Optional Chaining in Modern JS

Two handy tools for safer, cleaner code and avoiding null/undefined errors.

Nullish Coalescing (??)

const price = product.price ?? 0; // price will be 0 if product.price is null or undefined 

Optional Chaining (?.)

const email = user?.profile?.email; // Returns undefined if user or profile doesn't exist 

Conclusion

Combine these two operators to easily handle uncertain values in JS!