Optional chaining

?. safely accesses properties or calls methods when a value may be null or undefined.

Example

const user = { profile: { email: "test@mail.com" } };
user.profile?.email;
user.account?.email;

Common forms

• Method call: user.getInfo?.()
• Array access: cart?.[0]
• With ??: user.profile?.email ?? "No email"

Notes

• Only guards null and undefined.
• Supported since TypeScript 3.7.