When should I use union types in TypeScript?

When should I use union types in TypeScript?

Union types in TypeScript are useful when a variable can hold multiple types. For example, if a function can accept either a string or a number, you can define it as string | number. This enhances type safety and flexibility.

Can you give me an example of a union type in a function?

Sure! Here's an example:

function printId(id: string | number) {
    console.log(`Your ID is: ${id}`);
}

In this function, id can be either a string or a number.

Are there any downsides to using union types?

One downside is that it can make your code harder to read if overused. Additionally, you may need to use type guards to handle different types safely, which can add complexity.

When should I avoid using union types?

Avoid using union types when the types are too diverse or when it complicates the logic of your code. If you find yourself needing many type checks, it might be better to use a more specific type or an interface.