What are union types in TypeScript?

What are union types in TypeScript?

Union types in TypeScript allow you to define a variable that can hold multiple types. For example, you can declare a variable that can be either a string or a number.

Can you give me an example of how to use union types?

Sure! Here's an example:

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

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

What happens if I try to use a type that is not part of the union?

If you try to pass a type that is not part of the union, TypeScript will throw a compilation error, ensuring type safety.

Are there any limitations to using union types?

One limitation is that you cannot access properties or methods that are specific to one type without type narrowing. You need to check the type first.