Hello,
following scenario: In my Model, I want to keep track of a collection of
items as well as the currently active item. Sounds simple enough, but there
are some constraints. I want to serialize my Model (use programWithFlags),
so I cannot use a Dict directly to the best of my knowledge. I need to be
able to sort the collection and be able to append items at the beginning as
well at the end.
I've come up with the following options and it would be appreciated if I
could get some feedback on what the community thinks is best and why.
Option 1: List and explicit Item
type alias Model =
{ collection : List Item
, itemActive : Item
}
type alias Item =
{ name : String
}
Downside: I have to manually update the list if the item changes (it's what
I have in place currently and it is somewhat obvious to me that this is not
best).
Option 2: List with index
type alias Model =
{ collection : List Item
, itemActive : Int
}
type alias Item =
{ name : String
}
Downside: accessing a random item in a list is expensive (although in
practice my collection is never going to be very long, it could get
arbitrarily long).
Option 3: Dict with index
type alias Model =
{ collection : Dict Int Item
, itemActive : Int
}
type alias Item =
{ name : String
}
Downside: Dict is not supported by programWithFlags, so I'd have to
transform it to a different representation for serialization
Option 4: array with index
type alias Model =
{ collection : Array Item
, itemActive : Item
}
type alias Item =
{ name : String
}
Downside: I need to perform some operations that don't seem to be first
class array operations, namely sort the array by Item.name and insert items
at the front
I think I know how to implement each of these approaches, but maybe I'm
missing an even better fit for my use case. Currently I prefer Option 3.
Even though it might need a bit more work on the serialization /
de-serialization side, I feel like a Dict would be the best fit for my use
case.
Thanks in advance,
Robert
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