If you model the dict values (image URLs) with something like
type AlbumImageState
= NotLoaded
| Cached Url
| Loaded Url
| Error Http.Error
Would that help? When you get back the list in the first request,
initialize the values to NotLoaded. Then you could then write a function
like
allLoadedOrError : List ImageUrlState -> Bool
to check if all the album-image requests have returned, before writing the
successes to localstorage.
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