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Improved twelve-days exercise #138

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Jun 6, 2016
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Improved twelve-days exercise #138

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82 changes: 65 additions & 17 deletions exercises/twelve-days/Example.fs
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Original file line number Diff line number Diff line change
@@ -1,20 +1,68 @@
module TwelveDaysSong

let private allVerses = [|
"On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.\n";
"On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the seventh day of Christmas my true love gave to me, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the tenth day of Christmas my true love gave to me, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the eleventh day of Christmas my true love gave to me, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
"On the twelfth day of Christmas my true love gave to me, twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
|]
let numberToStr =
function
| 0 -> "a"
| 1 -> "and a"
| 2 -> "two"
| 3 -> "three"
| 4 -> "four"
| 5 -> "five"
| 6 -> "six"
| 7 -> "seven"
| 8 -> "eight"
| 9 -> "nine"
| 10 -> "ten"
| 11 -> "eleven"
| 12 -> "twelve"
| _ -> failwith "Invalid day"

let verse number = Array.item (number - 1) allVerses
let verses start stop = allVerses.[(start - 1)..(stop - 1)] |> Array.fold (fun acc x -> acc + x + "\n") ""
let song = verses 1 (allVerses.Length)
let countToStr =
function
| 1 -> "first"
| 2 -> "second"
| 3 -> "third"
| 4 -> "fourth"
| 5 -> "fifth"
| 6 -> "sixth"
| 7 -> "seventh"
| 8 -> "eighth"
| 9 -> "ninth"
| 10 -> "tenth"
| 11 -> "eleventh"
| 12 -> "twelfth"
| _ -> failwith "Invalid count"

let subject =
function
| 0 -> "Partridge in a Pear Tree";
| 1 -> "Partridge in a Pear Tree";
| 2 -> "Turtle Doves";
| 3 -> "French Hens";
| 4 -> "Calling Birds";
| 5 -> "Gold Rings";
| 6 -> "Geese-a-Laying";
| 7 -> "Swans-a-Swimming";
| 8 -> "Maids-a-Milking";
| 9 -> "Ladies Dancing";
| 10 -> "Lords-a-Leaping";
| 11 -> "Pipers Piping";
| 12 -> "Drummers Drumming"
| _ -> failwith "Invalid subject"

let subjectToStr number = sprintf "%s %s" (numberToStr number) (subject number)

let verseBegin number = sprintf "On the %s day of Christmas my true love gave to me, " (countToStr number)

let verseEnd =
function
| 1 ->
subjectToStr 0
| number ->
[number .. -1 .. 1]
|> List.map subjectToStr
|> List.reduce (fun x y -> x + ", " + y)

let verse number = sprintf "%s%s.\n" (verseBegin number) (verseEnd number)
let verses start stop = List.fold (fun acc x -> acc + verse x + "\n") "" [start..stop]
let song = verses 1 12