Add go/twelve-days
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dwrz
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# Twelve Days
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Output the lyrics to 'The Twelve Days of Christmas'.
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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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```
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## Running the tests
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To run the tests run the command `go test` from within the exercise directory.
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If the test suite contains benchmarks, you can run these with the `--bench` and `--benchmem`
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flags:
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go test -v --bench . --benchmem
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Keep in mind that each reviewer will run benchmarks on a different machine, with
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different specs, so the results from these benchmark tests may vary.
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## Further information
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For more detailed information about the Go track, including how to get help if
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you're having trouble, please visit the exercism.io [Go language page](http://exercism.io/languages/go/resources).
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## Source
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Wikipedia [http://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song)](http://en.wikipedia.org/wiki/The_Twelve_Days_of_Christmas_(song))
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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// Package twelve outputs the lyrics to The Twelve Days of Christmas.
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package twelve
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import (
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"fmt"
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)
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var ordinals = [13]string{
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"zeroth",
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"first",
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"second",
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"third",
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"fourth",
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"fifth",
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"sixth",
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"seventh",
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"eighth",
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"ninth",
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"tenth",
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"eleventh",
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"twelfth",
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}
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var gifts = [13]string{
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"a null pointer",
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"a Partridge in a Pear Tree",
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"two Turtle Doves",
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"three French Hens",
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"four Calling Birds",
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"five Gold Rings",
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"six Geese-a-Laying",
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"seven Swans-a-Swimming",
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"eight Maids-a-Milking",
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"nine Ladies Dancing",
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"ten Lords-a-Leaping",
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"eleven Pipers Piping",
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"twelve Drummers Drumming",
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}
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func giftsForDay(day int) string {
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switch day {
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case 0, 1:
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return gifts[day]
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case 2:
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return fmt.Sprintf(
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"%s, and %s",
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gifts[day],
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gifts[day-1],
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)
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default:
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return fmt.Sprintf(
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"%s, %s",
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gifts[day],
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giftsForDay(day-1),
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)
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}
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}
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func Verse(day int) string {
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return fmt.Sprintf(
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"On the %s day of Christmas my true love gave to me: %s.",
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ordinals[day],
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giftsForDay(day),
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)
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}
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func Song() (song string) {
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for day := 1; day <= 12; day++ {
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song += fmt.Sprintf("%s\n", Verse(day))
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}
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return
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}
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@@ -0,0 +1,71 @@
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package twelve
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import (
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"fmt"
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"strings"
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"testing"
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)
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type testCase struct {
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input int
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expected string
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}
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var testCases = []testCase{
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{1, "On the first day of Christmas my true love gave to me: a Partridge in a Pear Tree."},
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{2, "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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{3, "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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{4, "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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{5, "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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{6, "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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{7, "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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{8, "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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{9, "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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{10, "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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{11, "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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{12, "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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}
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// diff compares two multi-line strings and returns a helpful comment
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func diff(got, want string) string {
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g := strings.Split(got, "\n")
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w := strings.Split(want, "\n")
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for i := 0; ; i++ {
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switch {
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case i < len(g) && i < len(w):
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if g[i] == w[i] {
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continue
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}
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return fmt.Sprintf("-- first difference in line %d:\n"+
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"-- got : %q\n-- want: %q\n", i+1, g[i], w[i])
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case i < len(g):
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return fmt.Sprintf("-- got %d extra lines after line %d:\n"+
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"-- first extra line: %q\n", len(g)-len(w), i, g[i])
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case i < len(w):
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return fmt.Sprintf("-- got %d correct lines, want %d more lines:\n"+
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"-- want next: %q\n", i, len(w)-i, w[i])
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default:
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return "no differences found"
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}
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}
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}
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func TestSong(t *testing.T) {
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var expected = ""
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for _, test := range testCases {
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expected += test.expected + "\n"
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}
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actual := Song()
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if expected != actual {
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t.Fatalf("Song() =\n%s\n want:\n%s\n%s", actual, expected, diff(actual, expected))
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}
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}
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func TestVerse(t *testing.T) {
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for _, test := range testCases {
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actual := Verse(test.input)
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if actual != test.expected {
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t.Errorf("Twelve Days test [%d], expected [%s], actual [%s]", test.input, test.expected, actual)
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}
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}
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}
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