TypeScript: Enum vs Const

What are the differences between enums and const in TypeScript?

In TypeScript, enums are a way to define a set of named constants, while const is used to declare variables that cannot be reassigned. Enums can be numeric or string-based, providing a way to group related values.

Can you give me an example of when to use an enum instead of a const?

Sure! Use an enum when you have a fixed set of related values, like days of the week. For example: enum Days { Monday, Tuesday, Wednesday }. Use const for single values or when you want to create a constant object.

Are there any performance differences between using enums and const?

Enums can have a slight overhead due to their additional features, like reverse mapping. Const, being a simple constant, is generally more performant for single values.

What about type safety? Which one is safer to use?

Enums provide better type safety as they restrict values to the defined set. Const can be type-safe too, but it allows any value that matches its type.