Heterogeneous Arrays

If you can do it in JavaScript, you can model it in TypeScript. It might not always be pretty... but in this case it is!

In languages like Go, you can't have an array that contains different types - at least not without using something a bit more complex like a struct or an interface. But in TypeScript, we can just union the types!

// TypeScript infers the type as (string | number)[]
let lightsaberStyles = [1, 2, "double", "shoto"];

function describe(style: string | number): void {
  console.log(`Wield ${style} lightsaber`);
}

lightsaberStyles.forEach(describe);
// Wield 1 lightsaber
// Wield 2 lightsaber
// Wield double lightsaber
// Wield shoto lightsaber

Just use a pipe | to create union types. Easy!