C#•2y ago

❔ Is there an equivalent feature to TypeScript's Indexed Access Types?

e.g.

type Example<T> = {
  items: T[]
}

type StringItems = Example<string>["items"]
// string[]

function getStringItem(stringItems:StringItems){
  // ...
}

type Example<T> = {
  items: T[]
}

type StringItems = Example<string>["items"]
// string[]

function getStringItem(stringItems:StringItems){
  // ...
}

4 Replies

ero•2y ago

I struggle to understand what this does. Doesn't this defeat the whole point of static typing?

Thinker•2y ago

Unfortunately C#'s type system is nowhere near as sophisticated as TypeScript's, so sadly this is not possible It's not possible to describe a type through other types like this.

enteleformOP•2y ago

It facilitates reuse of types rather than duplication. e.g. StringItems can be reused as many times as necessary, VS having to write Example<string>["items"] (or a much more complex type 💀) every time. More info @ https://www.typescriptlang.org/docs/handbook/2/indexed-access-types.html Gotcha, thanks for the info!

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Is there an equivalent feature to TypeScript's Indexed Access Types?