What are the differences between TypeScript enums and union types?

What are the differences between TypeScript enums and union types?

TypeScript enums are a way to define a set of named constants, while union types allow a variable to hold multiple types. Enums are more structured, whereas union types are more flexible.

Can you give me an example of each?

Sure! An enum example: enum Color { Red, Green, Blue }. A union type example: type Shape = 'circle' | 'square' | 'triangle';.

When should I use enums instead of union types?

Use enums when you need a fixed set of related constants, especially if you want to refer to them by name. Use union types for more flexible scenarios where a variable can take on multiple specific values.

Are there any performance differences between the two?

Generally, there are no significant performance differences in most applications. The choice should be based on code clarity and maintainability.