What are the common mistakes when using union and optional types?

What are the common mistakes when using union and optional types?

Common mistakes include confusing union types with optional types, and not handling all possible cases in type checks.

Can you give me an example of a union type?

Sure! A union type can be defined as string | number, meaning a variable can hold either a string or a number.

What about optional types? How do they differ?

Optional types are defined with a question mark, like name?: string, indicating that the property may be undefined.

What happens if I forget to check for undefined values?

If you forget to check for undefined values, it can lead to runtime errors when trying to access properties on an undefined variable.

How can I avoid these mistakes in my code?

You can avoid these mistakes by using TypeScript's strict mode, which enforces type checks and helps catch errors early.