does anyone have a very good use case for context ...

# getting-started

[Bernhard]

does anyone have a very good use case for context providers? to me it looks like a native Reader Monad and I don't really understand what it really offers over just using a class and constructors (or heck, partially applied functions)

[CLOVIS]

What do you mean by context providers? Are you talking about context parameters?

[Bernhard]

Yes

[CLOVIS]

There are lots of good examples

[CLOVIS]

For DSLs in particular, they allow much more complex scope management that wasn't possible until now

[Bernhard]

I see haven't thought about that

[Youssef Shoaib [MOD]]

It's more so a native reader effect. It composes extremely well and is unordered. A Reader monad transformer is inherently ordered; the same thing with partial application.

[AndreyVanDenHaag]

The example at the presentation yesterday was probably not the best, because it did not expose any real value. Can you provide a link to other examples?

[CLOVIS]

Take a look at the KEEP, it has a few: https://github.com/Kotlin/KEEP/blob/context-parameters/proposals/context-parameters.md

[Jens Alfke]

I’m using it in a transactional API, where mutating methods can only be called during a transaction. Those methods take the txn as a context parameter, and the only way to get that context is within the closure of the inTransaction { } function.