What are some examples of union types in programming?

What are some examples of union types in programming?

Union types allow a variable to hold multiple types of values. For example, in TypeScript, you can define a variable as either a string or a number.

Can you give me a specific code example?

Sure! Here's a TypeScript example:

let value: string | number;
value = 'Hello'; // valid
value = 42; // also valid

What happens if I try to assign a boolean to it?

If you try to assign a boolean, TypeScript will throw an error because boolean is not part of the defined union type.

Are there union types in other programming languages?

Yes, many languages have similar concepts. For example, in Swift, you can use enums to create union-like types.