I propose we extend sequence expressions to handle ranges involving units of measure. Currently we cannot do the following:
let maximumDistance = 3<km>
let minimumDistance = 1<km>
let trials = [ minimumDistance .. maximumDistance ]
The existing way of approaching this problem in F# is to generate a range from bare integers and then map a multiplication to add the dimension
The advantages of making this adjustment to F# are
The disadvantages of making this adjustment to F# are
Estimated cost (XS, S, M, L, XL, XXL):
M? (because of the added complication of min .. step .. max)
min .. step .. max
Related suggestions: (put links to reated suggestions here)
Allow units of measure in for loops #534
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Looks like the problem is that units of measure don't support the GenericOne operator, possibly because being a measure, which is basically a multiplication, 'zero' is an absolute value but 'one' is relative to the measure.
Since the (..) operator uses the GenericOne it doesn't work, of course you can write this:
let trials = [ minimumDistance .. 1<km> .. maximumDistance ]
Alternatively, or if this suggestion doesn't get approved, you can suggest to add GenericOne to a library that offers language extensions, like FSharpPlus which will redefine some generic operators, like (..) so the code you posted would work, but will be interesting to understand the reason why it wasn't added to F# in first place.
Cool, I didn't know that adding measure to the steps would work!