Given an amount of days, say 25, convert it into a duration text such as \"3 Weeks, 4 Days\"
C# and F# solutions would both be great if the F# variation offers any i
Here's an F# version based on the previously posted C# version. The main difference is it's applicative rather than imperative (no mutable variables).
#light
let conversions = [|
365, "Year", "Years"
30, "Month", "Months"
7, "Week", "Weeks"
1, "Day", "Days" |]
let ToDuration numDays =
conversions
|> Array.fold_left (fun (remainDays,results) (n,sing,plur) ->
let count = remainDays / n
if count >= 1 then
remainDays - (count * n),
(sprintf "%d %s" count (if count=1 then sing else plur)) :: results
else
remainDays, results
) (numDays,[])
|> snd |> (fun rs -> System.String.Join(", ", List.rev rs |> List.to_array))
printfn "%s" (ToDuration 1008)
This is a recursive solution. Note that a duration only really makes sense measured against a particular point in time on a given calendar because month and year lengths vary. But here is a simple solution assuming fixed lengths:
let divmod n m = n / m, n % m
let units = [
("Centuries", TimeSpan.TicksPerDay * 365L * 100L );
("Years", TimeSpan.TicksPerDay * 365L);
("Weeks", TimeSpan.TicksPerDay * 7L);
("Days", TimeSpan.TicksPerDay)
]
let duration days =
let rec duration' ticks units acc =
match units with
| [] -> acc
| (u::us) ->
let (wholeUnits, ticksRemaining) = divmod ticks (snd u)
duration' ticksRemaining us (((fst u), wholeUnits) :: acc)
duration' (TimeSpan.FromDays(float days).Ticks) units []
String.Format("{0} Weeks, {1} days", days / 7, days % 7);
public class UnitOfMeasure {
public UnitOfMeasure(string name, int value) {
Name = name;
Value = value;
}
public string Name { get; set; }
public int Value { get; set; }
public static UnitOfMeasure[] All = new UnitOfMeasure[] {
new UnitOfMeasure("Year", 356),
new UnitOfMeasure("Month", 30),
new UnitOfMeasure("Week", 7),
new UnitOfMeasure("Day", 1)
};
public static string ConvertToDuration(int days) {
List<string> results = new List<string>();
for (int i = 0; i < All.Length; i++) {
int count = days / All[i].Value;
if (count >= 1) {
results.Add((count + " " + All[i].Name) + (count == 1 ? string.Empty : "s"));
days -= count * All[i].Value;
}
}
return string.Join(", ", results.ToArray());
}
}