From edf61d9e3c3b468b0f6256f0574f639d4dff72a3 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Tue, 30 Aug 2016 13:47:47 +0200 Subject: Import beer song problem --- go/beer-song/README.md | 339 ++++++++++++++++++++++++++++++++++++++++++++++ go/beer-song/beer_test.go | 139 +++++++++++++++++++ 2 files changed, 478 insertions(+) create mode 100644 go/beer-song/README.md create mode 100644 go/beer-song/beer_test.go diff --git a/go/beer-song/README.md b/go/beer-song/README.md new file mode 100644 index 0000000..889cf25 --- /dev/null +++ b/go/beer-song/README.md @@ -0,0 +1,339 @@ +# Beer Song + +Write a program which produces the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall. + +Note that not all verses are identical. + +```plain +99 bottles of beer on the wall, 99 bottles of beer. +Take one down and pass it around, 98 bottles of beer on the wall. + +98 bottles of beer on the wall, 98 bottles of beer. +Take one down and pass it around, 97 bottles of beer on the wall. + +97 bottles of beer on the wall, 97 bottles of beer. +Take one down and pass it around, 96 bottles of beer on the wall. + +96 bottles of beer on the wall, 96 bottles of beer. +Take one down and pass it around, 95 bottles of beer on the wall. + +95 bottles of beer on the wall, 95 bottles of beer. +Take one down and pass it around, 94 bottles of beer on the wall. + +94 bottles of beer on the wall, 94 bottles of beer. +Take one down and pass it around, 93 bottles of beer on the wall. + +93 bottles of beer on the wall, 93 bottles of beer. +Take one down and pass it around, 92 bottles of beer on the wall. + +92 bottles of beer on the wall, 92 bottles of beer. +Take one down and pass it around, 91 bottles of beer on the wall. + +91 bottles of beer on the wall, 91 bottles of beer. +Take one down and pass it around, 90 bottles of beer on the wall. + +90 bottles of beer on the wall, 90 bottles of beer. +Take one down and pass it around, 89 bottles of beer on the wall. + +89 bottles of beer on the wall, 89 bottles of beer. +Take one down and pass it around, 88 bottles of beer on the wall. + +88 bottles of beer on the wall, 88 bottles of beer. +Take one down and pass it around, 87 bottles of beer on the wall. + +87 bottles of beer on the wall, 87 bottles of beer. +Take one down and pass it around, 86 bottles of beer on the wall. + +86 bottles of beer on the wall, 86 bottles of beer. +Take one down and pass it around, 85 bottles of beer on the wall. + +85 bottles of beer on the wall, 85 bottles of beer. +Take one down and pass it around, 84 bottles of beer on the wall. + +84 bottles of beer on the wall, 84 bottles of beer. +Take one down and pass it around, 83 bottles of beer on the wall. + +83 bottles of beer on the wall, 83 bottles of beer. +Take one down and pass it around, 82 bottles of beer on the wall. + +82 bottles of beer on the wall, 82 bottles of beer. +Take one down and pass it around, 81 bottles of beer on the wall. + +81 bottles of beer on the wall, 81 bottles of beer. +Take one down and pass it around, 80 bottles of beer on the wall. + +80 bottles of beer on the wall, 80 bottles of beer. +Take one down and pass it around, 79 bottles of beer on the wall. + +79 bottles of beer on the wall, 79 bottles of beer. +Take one down and pass it around, 78 bottles of beer on the wall. + +78 bottles of beer on the wall, 78 bottles of beer. +Take one down and pass it around, 77 bottles of beer on the wall. + +77 bottles of beer on the wall, 77 bottles of beer. +Take one down and pass it around, 76 bottles of beer on the wall. + +76 bottles of beer on the wall, 76 bottles of beer. +Take one down and pass it around, 75 bottles of beer on the wall. + +75 bottles of beer on the wall, 75 bottles of beer. +Take one down and pass it around, 74 bottles of beer on the wall. + +74 bottles of beer on the wall, 74 bottles of beer. +Take one down and pass it around, 73 bottles of beer on the wall. + +73 bottles of beer on the wall, 73 bottles of beer. +Take one down and pass it around, 72 bottles of beer on the wall. + +72 bottles of beer on the wall, 72 bottles of beer. +Take one down and pass it around, 71 bottles of beer on the wall. + +71 bottles of beer on the wall, 71 bottles of beer. +Take one down and pass it around, 70 bottles of beer on the wall. + +70 bottles of beer on the wall, 70 bottles of beer. +Take one down and pass it around, 69 bottles of beer on the wall. + +69 bottles of beer on the wall, 69 bottles of beer. +Take one down and pass it around, 68 bottles of beer on the wall. + +68 bottles of beer on the wall, 68 bottles of beer. +Take one down and pass it around, 67 bottles of beer on the wall. + +67 bottles of beer on the wall, 67 bottles of beer. +Take one down and pass it around, 66 bottles of beer on the wall. + +66 bottles of beer on the wall, 66 bottles of beer. +Take one down and pass it around, 65 bottles of beer on the wall. + +65 bottles of beer on the wall, 65 bottles of beer. +Take one down and pass it around, 64 bottles of beer on the wall. + +64 bottles of beer on the wall, 64 bottles of beer. +Take one down and pass it around, 63 bottles of beer on the wall. + +63 bottles of beer on the wall, 63 bottles of beer. +Take one down and pass it around, 62 bottles of beer on the wall. + +62 bottles of beer on the wall, 62 bottles of beer. +Take one down and pass it around, 61 bottles of beer on the wall. + +61 bottles of beer on the wall, 61 bottles of beer. +Take one down and pass it around, 60 bottles of beer on the wall. + +60 bottles of beer on the wall, 60 bottles of beer. +Take one down and pass it around, 59 bottles of beer on the wall. + +59 bottles of beer on the wall, 59 bottles of beer. +Take one down and pass it around, 58 bottles of beer on the wall. + +58 bottles of beer on the wall, 58 bottles of beer. +Take one down and pass it around, 57 bottles of beer on the wall. + +57 bottles of beer on the wall, 57 bottles of beer. +Take one down and pass it around, 56 bottles of beer on the wall. + +56 bottles of beer on the wall, 56 bottles of beer. +Take one down and pass it around, 55 bottles of beer on the wall. + +55 bottles of beer on the wall, 55 bottles of beer. +Take one down and pass it around, 54 bottles of beer on the wall. + +54 bottles of beer on the wall, 54 bottles of beer. +Take one down and pass it around, 53 bottles of beer on the wall. + +53 bottles of beer on the wall, 53 bottles of beer. +Take one down and pass it around, 52 bottles of beer on the wall. + +52 bottles of beer on the wall, 52 bottles of beer. +Take one down and pass it around, 51 bottles of beer on the wall. + +51 bottles of beer on the wall, 51 bottles of beer. +Take one down and pass it around, 50 bottles of beer on the wall. + +50 bottles of beer on the wall, 50 bottles of beer. +Take one down and pass it around, 49 bottles of beer on the wall. + +49 bottles of beer on the wall, 49 bottles of beer. +Take one down and pass it around, 48 bottles of beer on the wall. + +48 bottles of beer on the wall, 48 bottles of beer. +Take one down and pass it around, 47 bottles of beer on the wall. + +47 bottles of beer on the wall, 47 bottles of beer. +Take one down and pass it around, 46 bottles of beer on the wall. + +46 bottles of beer on the wall, 46 bottles of beer. +Take one down and pass it around, 45 bottles of beer on the wall. + +45 bottles of beer on the wall, 45 bottles of beer. +Take one down and pass it around, 44 bottles of beer on the wall. + +44 bottles of beer on the wall, 44 bottles of beer. +Take one down and pass it around, 43 bottles of beer on the wall. + +43 bottles of beer on the wall, 43 bottles of beer. +Take one down and pass it around, 42 bottles of beer on the wall. + +42 bottles of beer on the wall, 42 bottles of beer. +Take one down and pass it around, 41 bottles of beer on the wall. + +41 bottles of beer on the wall, 41 bottles of beer. +Take one down and pass it around, 40 bottles of beer on the wall. + +40 bottles of beer on the wall, 40 bottles of beer. +Take one down and pass it around, 39 bottles of beer on the wall. + +39 bottles of beer on the wall, 39 bottles of beer. +Take one down and pass it around, 38 bottles of beer on the wall. + +38 bottles of beer on the wall, 38 bottles of beer. +Take one down and pass it around, 37 bottles of beer on the wall. + +37 bottles of beer on the wall, 37 bottles of beer. +Take one down and pass it around, 36 bottles of beer on the wall. + +36 bottles of beer on the wall, 36 bottles of beer. +Take one down and pass it around, 35 bottles of beer on the wall. + +35 bottles of beer on the wall, 35 bottles of beer. +Take one down and pass it around, 34 bottles of beer on the wall. + +34 bottles of beer on the wall, 34 bottles of beer. +Take one down and pass it around, 33 bottles of beer on the wall. + +33 bottles of beer on the wall, 33 bottles of beer. +Take one down and pass it around, 32 bottles of beer on the wall. + +32 bottles of beer on the wall, 32 bottles of beer. +Take one down and pass it around, 31 bottles of beer on the wall. + +31 bottles of beer on the wall, 31 bottles of beer. +Take one down and pass it around, 30 bottles of beer on the wall. + +30 bottles of beer on the wall, 30 bottles of beer. +Take one down and pass it around, 29 bottles of beer on the wall. + +29 bottles of beer on the wall, 29 bottles of beer. +Take one down and pass it around, 28 bottles of beer on the wall. + +28 bottles of beer on the wall, 28 bottles of beer. +Take one down and pass it around, 27 bottles of beer on the wall. + +27 bottles of beer on the wall, 27 bottles of beer. +Take one down and pass it around, 26 bottles of beer on the wall. + +26 bottles of beer on the wall, 26 bottles of beer. +Take one down and pass it around, 25 bottles of beer on the wall. + +25 bottles of beer on the wall, 25 bottles of beer. +Take one down and pass it around, 24 bottles of beer on the wall. + +24 bottles of beer on the wall, 24 bottles of beer. +Take one down and pass it around, 23 bottles of beer on the wall. + +23 bottles of beer on the wall, 23 bottles of beer. +Take one down and pass it around, 22 bottles of beer on the wall. + +22 bottles of beer on the wall, 22 bottles of beer. +Take one down and pass it around, 21 bottles of beer on the wall. + +21 bottles of beer on the wall, 21 bottles of beer. +Take one down and pass it around, 20 bottles of beer on the wall. + +20 bottles of beer on the wall, 20 bottles of beer. +Take one down and pass it around, 19 bottles of beer on the wall. + +19 bottles of beer on the wall, 19 bottles of beer. +Take one down and pass it around, 18 bottles of beer on the wall. + +18 bottles of beer on the wall, 18 bottles of beer. +Take one down and pass it around, 17 bottles of beer on the wall. + +17 bottles of beer on the wall, 17 bottles of beer. +Take one down and pass it around, 16 bottles of beer on the wall. + +16 bottles of beer on the wall, 16 bottles of beer. +Take one down and pass it around, 15 bottles of beer on the wall. + +15 bottles of beer on the wall, 15 bottles of beer. +Take one down and pass it around, 14 bottles of beer on the wall. + +14 bottles of beer on the wall, 14 bottles of beer. +Take one down and pass it around, 13 bottles of beer on the wall. + +13 bottles of beer on the wall, 13 bottles of beer. +Take one down and pass it around, 12 bottles of beer on the wall. + +12 bottles of beer on the wall, 12 bottles of beer. +Take one down and pass it around, 11 bottles of beer on the wall. + +11 bottles of beer on the wall, 11 bottles of beer. +Take one down and pass it around, 10 bottles of beer on the wall. + +10 bottles of beer on the wall, 10 bottles of beer. +Take one down and pass it around, 9 bottles of beer on the wall. + +9 bottles of beer on the wall, 9 bottles of beer. +Take one down and pass it around, 8 bottles of beer on the wall. + +8 bottles of beer on the wall, 8 bottles of beer. +Take one down and pass it around, 7 bottles of beer on the wall. + +7 bottles of beer on the wall, 7 bottles of beer. +Take one down and pass it around, 6 bottles of beer on the wall. + +6 bottles of beer on the wall, 6 bottles of beer. +Take one down and pass it around, 5 bottles of beer on the wall. + +5 bottles of beer on the wall, 5 bottles of beer. +Take one down and pass it around, 4 bottles of beer on the wall. + +4 bottles of beer on the wall, 4 bottles of beer. +Take one down and pass it around, 3 bottles of beer on the wall. + +3 bottles of beer on the wall, 3 bottles of beer. +Take one down and pass it around, 2 bottles of beer on the wall. + +2 bottles of beer on the wall, 2 bottles of beer. +Take one down and pass it around, 1 bottle of beer on the wall. + +1 bottle of beer on the wall, 1 bottle of beer. +Take it down and pass it around, no more bottles of beer on the wall. + +No more bottles of beer on the wall, no more bottles of beer. +Go to the store and buy some more, 99 bottles of beer on the wall. +``` + +## For bonus points + +Did you get the tests passing and the code clean? If you want to, these +are some additional things you could try: + +* Remove as much duplication as you possibly can. +* Optimize for readability, even if it means introducing duplication. +* If you've removed all the duplication, do you have a lot of + conditionals? Try replacing the conditionals with polymorphism, if it + applies in this language. How readable is it? + +Then please share your thoughts in a comment on the submission. Did this +experiment make the code better? Worse? Did you learn anything from it? + +To run the tests simply run the command `go test` in the exercise directory. + +If the test suite contains benchmarks, you can run these with the `-bench` +flag: + + go test -bench . + +For more detailed info about the Go track see the [help +page](http://exercism.io/languages/go). + +## Source + +Learn to Program by Chris Pine [http://pine.fm/LearnToProgram/?Chapter=06](http://pine.fm/LearnToProgram/?Chapter=06) + +## Submitting Incomplete Problems +It's possible to submit an incomplete solution so you can see how others have completed the exercise. + diff --git a/go/beer-song/beer_test.go b/go/beer-song/beer_test.go new file mode 100644 index 0000000..38809c8 --- /dev/null +++ b/go/beer-song/beer_test.go @@ -0,0 +1,139 @@ +package beer + +import ( + "testing" +) + +const verse8 = "8 bottles of beer on the wall, 8 bottles of beer.\nTake one down and pass it around, 7 bottles of beer on the wall.\n" +const verse3 = "3 bottles of beer on the wall, 3 bottles of beer.\nTake one down and pass it around, 2 bottles of beer on the wall.\n" +const verse2 = "2 bottles of beer on the wall, 2 bottles of beer.\nTake one down and pass it around, 1 bottle of beer on the wall.\n" +const verse1 = "1 bottle of beer on the wall, 1 bottle of beer.\nTake it down and pass it around, no more bottles of beer on the wall.\n" +const verse0 = "No more bottles of beer on the wall, no more bottles of beer.\nGo to the store and buy some more, 99 bottles of beer on the wall.\n" + +const verses86 = `8 bottles of beer on the wall, 8 bottles of beer. +Take one down and pass it around, 7 bottles of beer on the wall. + +7 bottles of beer on the wall, 7 bottles of beer. +Take one down and pass it around, 6 bottles of beer on the wall. + +6 bottles of beer on the wall, 6 bottles of beer. +Take one down and pass it around, 5 bottles of beer on the wall. + +` + +const verses75 = `7 bottles of beer on the wall, 7 bottles of beer. +Take one down and pass it around, 6 bottles of beer on the wall. + +6 bottles of beer on the wall, 6 bottles of beer. +Take one down and pass it around, 5 bottles of beer on the wall. + +5 bottles of beer on the wall, 5 bottles of beer. +Take one down and pass it around, 4 bottles of beer on the wall. + +` + +var verseTestCases = []struct { + description string + verse int + expectedVerse string + expectErr bool +}{ + {"a typical verse", 8, verse8, false}, + {"another typical verse", 3, verse3, false}, + {"verse 2", 2, verse2, false}, + {"verse 1", 1, verse1, false}, + {"verse 0", 0, verse0, false}, + {"invalid verse", 104, "", true}, +} + +func TestBottlesVerse(t *testing.T) { + for _, tt := range verseTestCases { + actualVerse, err := Verse(tt.verse) + if actualVerse != tt.expectedVerse { + t.Fatalf("Verse(%d):\nexpected\n%s\nactual\n%s", tt.verse, tt.expectedVerse, actualVerse) + } + + // if we expect an error and there isn't one + if tt.expectErr && err == nil { + t.Errorf("Verse(%d): expected an error, but error is nil", tt.verse) + } + // if we don't expect an error and there is one + if !tt.expectErr && err != nil { + t.Errorf("Verse(%d): expected no error, but error is: %s", tt.verse, err) + } + } +} + +var versesTestCases = []struct { + description string + upperBound int + lowerBound int + expectedVerse string + expectErr bool +}{ + {"multiple verses", 8, 6, verses86, false}, + {"a different set of verses", 7, 5, verses75, false}, + {"invalid start", 109, 5, "", true}, + {"invalid stop", 99, -20, "", true}, + {"start less than stop", 8, 14, "", true}, +} + +func TestSeveralVerses(t *testing.T) { + + for _, tt := range versesTestCases { + actualVerse, err := Verses(tt.upperBound, tt.lowerBound) + if actualVerse != tt.expectedVerse { + t.Fatalf("Verses(%d, %d):\nexpected\n%s\nactual\n%s", tt.upperBound, tt.lowerBound, tt.expectedVerse, actualVerse) + } + // if we expect an error and there isn't one + if tt.expectErr && err == nil { + t.Errorf("Verses(%d, %d): expected an error, but error is nil", tt.upperBound, tt.lowerBound) + } + // if we don't expect an error and there is one + if !tt.expectErr && err != nil { + t.Errorf("Verses(%d, %d): expected no error, but error is: %s", tt.upperBound, tt.lowerBound, err) + } + } +} + +func BenchmarkSeveralVerses(b *testing.B) { + b.StopTimer() + for _, tt := range versesTestCases { + b.StartTimer() + + for i := 0; i < b.N; i++ { + Verses(tt.upperBound, tt.lowerBound) + } + + b.StopTimer() + } +} + +func TestEntireSong(t *testing.T) { + expected, err := Verses(99, 0) + if err != nil { + t.Fatalf("unexpected error calling Verses(99,0)") + } + actual := Song() + + if expected != actual { + msg := ` + Did not sing the whole song correctly. + + Expected: + + %v + + Actual: + + %v + ` + t.Fatalf(msg, expected, actual) + } +} + +func BenchmarkEntireSong(b *testing.B) { + for i := 0; i < b.N; i++ { + Song() + } +} -- cgit v1.2.3