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Add twelve-days exercise (#169)
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‎config.json

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"prerequisites": [],
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"difficulty": 3
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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": "fd218a7d-3c39-473b-a71b-ff984ea58b86",
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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": "house",
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"name": "House",

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

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# Instruction append
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Each verse should end with a newline `\n`, with no additional delimiter.

‎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/.eslintrc

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{
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"root": true,
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"extends": "@exercism/eslint-config-javascript",
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"env": {
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"jest": true
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},
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"overrides": [
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{
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"files": [
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"*.spec.js"
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],
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"excludedFiles": [
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"custom.spec.js"
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],
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"extends": "@exercism/eslint-config-javascript/maintainers"
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}
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]
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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.wat"
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],
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"test": [
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"twelve-days.spec.js"
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],
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"example": [
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".meta/proof.ci.wat"
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],
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"invalidator": [
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"package.json"
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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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"custom": {
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"version.tests.compatibility": "jest-27",
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"flag.tests.task-per-describe": false,
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"flag.tests.may-run-long": false,
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"flag.tests.includes-optional": false
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}
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}

‎exercises/practice/twelve-days/.meta/proof.ci.wat

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(module
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(memory (export "mem") 1)
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(data (i32.const 0) "On the ")
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(data (i32.const 10) "firstsecondthirdfourthfifthsixthseventheighthninthtentheleventhtwelfth")
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;; 8 bit offsets [0, 0, 5, 11, 16, 22, 27, 32, 39, 45, 50, 55, 63, 70]
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(data (i32.const 80) "\00\00\05\0b\10\16\1b\20\27\2d\32\37\3f\46\46")
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(data (i32.const 110) " day of Christmas my true love gave to me: ")
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(data (i32.const 160) "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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;; 8 bit offsets [0, 235, 213, 194, 174, 157, 137, 113, 90, 69, 48, 26, 0]
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(data (i32.const 430) "\00\eb\d5\c2\ae\9d\89\71\5a\45\30\1a\00")
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(global $ON_THE_OFFSET i32 (i32.const 0))
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(global $ON_THE_LENGTH i32 (i32.const 7))
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(global $ORDINALS_OFFSET i32 (i32.const 10))
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(global $ORDINALS_TABLE_OFFSET i32 (i32.const 80))
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(global $DAY_OF_OFFSET i32 (i32.const 110))
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(global $DAY_OF_LENGTH i32 (i32.const 43))
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(global $GIFTS_OFFSET i32 (i32.const 160))
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(global $GIFTS_LENGTH i32 (i32.const 263))
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(global $GIFTS_TABLE_OFFSET i32 (i32.const 430))
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(global $OUTPUT i32 (i32.const 460))
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;;
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;; Lyrics to 'The Twelve Days of Christmas'.
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;;
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;; @param {i32} startVerse - The initial verse to recite
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;; @param {i32} endVerse - The final verse to recite
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;;
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;; @returns {(i32,i32)} - Offset and length of result string
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;; in linear memory.
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;;
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(func (export "recite") (param $startVerse i32) (param $endVerse i32) (result i32 i32)
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(local $dest i32)
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(local $verse i32)
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(local $offset i32)
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(local $length i32)
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(local.set $dest (global.get $OUTPUT))
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(local.set $verse (local.get $startVerse))
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(loop $LOOP
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(memory.copy (local.get $dest)
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(global.get $ON_THE_OFFSET)
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(global.get $ON_THE_LENGTH))
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(local.set $dest (i32.add (local.get $dest)
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(global.get $ON_THE_LENGTH)))
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(local.set $offset (i32.add (global.get $ORDINALS_TABLE_OFFSET)
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(local.get $verse)))
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(local.set $length (i32.load8_u (i32.add (local.get $offset)
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(i32.const 1))))
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(local.set $offset (i32.load8_u (local.get $offset)))
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(local.set $length (i32.sub (local.get $length)
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(local.get $offset)))
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(memory.copy (local.get $dest)
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(i32.add (local.get $offset) (global.get $ORDINALS_OFFSET))
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(local.get $length))
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(local.set $dest (i32.add (local.get $dest)
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(local.get $length)))
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(memory.copy (local.get $dest)
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(global.get $DAY_OF_OFFSET)
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(global.get $DAY_OF_LENGTH))
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(local.set $dest (i32.add (local.get $dest)
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(global.get $DAY_OF_LENGTH)))
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(local.set $offset (i32.load8_u (i32.add (global.get $GIFTS_TABLE_OFFSET)
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(local.get $verse))))
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(local.set $length (i32.sub (global.get $GIFTS_LENGTH)
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(local.get $offset)))
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(memory.copy (local.get $dest)
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(i32.add (local.get $offset) (global.get $GIFTS_OFFSET))
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(local.get $length))
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(local.set $dest (i32.add (local.get $dest)
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(local.get $length)))
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(local.set $verse (i32.add (local.get $verse)
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(i32.const 1)))
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(br_if $LOOP (i32.le_u (local.get $verse)
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(local.get $endVerse)))
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)
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(return (global.get $OUTPUT) (i32.sub (local.get $dest)
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(global.get $OUTPUT)))
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)
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)

‎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/.npmrc

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audit=false

‎exercises/practice/twelve-days/LICENSE

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MIT License
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Copyright (c) 2021 Exercism
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎exercises/practice/twelve-days/babel.config.js

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export default {
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presets: ["@exercism/babel-preset-javascript"],
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plugins: [],
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};

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