DEV Community

Discussion on: #30daysofelm Day 20: Getting the browser's width and height

View post
Collapse
 
wolfadex profile image
Wolfgang Schuster •

When you say

That's a pretty chunky main function compared to what I've seen before.

I completely agree. It would be a lot better to change from GotInitialViewport Viewport to GotInitialViewport (Result x Viewport) (I'm not entirely sure what the type of the error is there). This moves the error handling to your update instead of your init.

I'm still catching up as I'm about 5 days behind, but from today's post it seems like you've been struggling with type variables a lot. Taking a look at guide.elm-lang.org/types/reading_t... another time might help. I don't have any specific resources for learning more about types but I'll try to find some.

Collapse
 
kristianpedersen profile image
Kristian Pedersen •

Thanks for the link! Yeah, that's an area I've been confused by, particularly when reading documentation.

I was kind of frustrated by the Task x Viewport, but reading the documentation again now, I see that it refers to an unsuccessful Task execution:

In each case we have a Task that will resolve successfully with an a value or unsuccessfully with an x value.

package.elm-lang.org/packages/elm/...

As I suspected, coming back to this project after having slept well, things make a lot more sense to me now.