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Add twelve-days exercise (#63)
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‎config.json

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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "twelve-days",
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"name": "Twelve Days",
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"uuid": "cd0467e6-14ca-4372-b896-aa44f537225b",
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"practices": [],
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"prerequisites": [],
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"difficulty": 5
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},
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{
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"slug": "variable-length-quantity",
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"name": "Variable Length Quantity",

‎exercises/practice/twelve-days/.docs/instructions.md

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# Instructions
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Your task in this exercise is to write code that returns the lyrics of the song: "The Twelve Days of Christmas."
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"The Twelve Days of Christmas" is a common English Christmas carol.
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Each subsequent verse of the song builds on the previous verse.
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The lyrics your code returns should _exactly_ match the full song text shown below.
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## Lyrics
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```text
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On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.
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On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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```

‎exercises/practice/twelve-days/.meta/config.json

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{
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"authors": [
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"keiravillekode"
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],
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"files": {
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"solution": [
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"twelve_days.fut"
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],
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"test": [
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"test.fut"
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],
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"example": [
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".meta/example.fut"
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]
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},
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"blurb": "Output the lyrics to 'The Twelve Days of Christmas'.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song)"
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}

‎exercises/practice/twelve-days/.meta/example.fut

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let ordinals = "firstsecondthirdfourthfifthsixthseventheighthninthtentheleventhtwelfth"
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let ordinals_table = [-1, 0, 5, 11, 16, 22, 27, 32, 39, 45, 50, 55, 63, 70]
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let gifts = "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"
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let gifts_table = [-1, 235, 213, 194, 174, 157, 137, 113, 90, 69, 48, 26, 0]
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def recite (start_verse: i32) (end_verse: i32): []u8 =
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let result = loop result = "" for verse in start_verse...end_verse do
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result ++ "On the " ++ ordinals[i64.i32 ordinals_table[verse]:i64.i32 ordinals_table[verse + 1]] ++ " day of Christmas my true love gave to me: " ++ gifts[i64.i32 gifts_table[verse]:]
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in
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result

‎exercises/practice/twelve-days/.meta/tests.toml

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[c0b5a5e6-c89d-49b1-a6b2-9f523bff33f7]
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description = "verse -> first day a partridge in a pear tree"
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[1c64508a-df3d-420a-b8e1-fe408847854a]
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description = "verse -> second day two turtle doves"
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[a919e09c-75b2-4e64-bb23-de4a692060a8]
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description = "verse -> third day three french hens"
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[9bed8631-ec60-4894-a3bb-4f0ec9fbe68d]
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description = "verse -> fourth day four calling birds"
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[cf1024f0-73b6-4545-be57-e9cea565289a]
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description = "verse -> fifth day five gold rings"
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[50bd3393-868a-4f24-a618-68df3d02ff04]
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description = "verse -> sixth day six geese-a-laying"
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[8f29638c-9bf1-4680-94be-e8b84e4ade83]
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description = "verse -> seventh day seven swans-a-swimming"
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[7038d6e1-e377-47ad-8c37-10670a05bc05]
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description = "verse -> eighth day eight maids-a-milking"
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[37a800a6-7a56-4352-8d72-0f51eb37cfe8]
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description = "verse -> ninth day nine ladies dancing"
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[10b158aa-49ff-4b2d-afc3-13af9133510d]
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description = "verse -> tenth day ten lords-a-leaping"
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[08d7d453-f2ba-478d-8df0-d39ea6a4f457]
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description = "verse -> eleventh day eleven pipers piping"
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[0620fea7-1704-4e48-b557-c05bf43967f0]
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description = "verse -> twelfth day twelve drummers drumming"
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[da8b9013-b1e8-49df-b6ef-ddec0219e398]
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description = "lyrics -> recites first three verses of the song"
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[c095af0d-3137-4653-ad32-bfb899eda24c]
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description = "lyrics -> recites three verses from the middle of the song"
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[20921bc9-cc52-4627-80b3-198cbbfcf9b7]
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description = "lyrics -> recites the whole song"

‎exercises/practice/twelve-days/test.fut

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import "twelve_days"
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-- first day a partridge in a pear tree
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-- ==
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-- input { 1 1 }
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-- output { "On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.\n" }
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-- second day two turtle doves
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-- ==
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-- input { 2 2 }
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-- output { "On the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.\n" }
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-- third day three french hens
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-- ==
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-- input { 3 3 }
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-- output { "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" }
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-- fourth day four calling birds
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-- ==
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-- input { 4 4 }
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-- output { "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" }
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-- fifth day five gold rings
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-- ==
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-- input { 5 5 }
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-- output { "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" }
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-- sixth day six geese-a-laying
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-- ==
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-- input { 6 6 }
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-- output { "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" }
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-- seventh day seven swans-a-swimming
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-- ==
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-- input { 7 7 }
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-- output { "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" }
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-- eighth day eight maids-a-milking
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-- ==
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-- input { 8 8 }
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-- output { "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" }
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-- ninth day nine ladies dancing
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-- ==
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-- input { 9 9 }
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-- output { "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" }
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-- tenth day ten lords-a-leaping
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-- ==
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-- input { 10 10 }
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-- output { "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" }
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-- eleventh day eleven pipers piping
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-- ==
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-- input { 11 11 }
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-- output { "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" }
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-- twelfth day twelve drummers drumming
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-- ==
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-- input { 12 12 }
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-- output { "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" }
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-- recites first three verses of the song
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-- ==
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-- input { 1 3 }
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-- output { "On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.\nOn the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.\nOn 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" }
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-- recites three verses from the middle of the song
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-- ==
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-- input { 4 6 }
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-- output { "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.\nOn 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.\nOn 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" }
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-- recites the whole song
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-- ==
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-- input { 1 12 }
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-- output { "On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree.\nOn the second day of Christmas my true love gave to me: two Turtle Doves, and a Partridge in a Pear Tree.\nOn the third day of Christmas my true love gave to me: three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\nOn 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.\nOn 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.\nOn 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.\nOn 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.\nOn 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.\nOn 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.\nOn 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.\nOn 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.\nOn 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" }
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let main (start_verse: i32) (end_verse: i32): []u8 =
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recite start_verse end_verse

‎exercises/practice/twelve-days/twelve_days.fut

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def recite (start_verse: i32) (end_verse: i32): []u8 = ???

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