Range function to generate a list of dates between two dates

[Gaith Hallak]

Sometimes, I find myself writing a function to generate a list of dates between two given dates, like this:

dateRange : Date -> Date -> List Date
dateRange firstDate lastDate =
  case Date.compare firstDate lastDate of
    GT ->
      []
    _ ->
      firstDate :: dateRange (Date.addDays 1 firstDate) lastDate

With the available library functions addMonths, addHours, addMinutes, etc.., the range function can be generalised to create ranges for different intervals (months, hours, minutes, etc...).

Would you consider adding such a function to the elm-time library?

[Scott Smith]

I have never heard of this use case; what are you using this function for? Are you building a calendar?

The community packages are intended to be basic building blocks that:

1. Are difficult or time-consuming to build on your own.
2. Have general applicability without being too specific.

To me, this sounds as though you have a fine opportunity to build a "calendar" or "datebook" package application and utilize your function above there instead.

Thanks for your suggestion. I like it but think that it belongs with the package that would incorporate it.

[Gaith Hallak]

You're right, I'm building a calendar and using this function to generate lists of dates, and it came to my mind that I should post this suggestion here to see what you think about it.

Thanks for your reply.