Updating all of the new ones that are done.
This commit is contained in:
339
go/beer-song/README.md
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339
go/beer-song/README.md
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@@ -0,0 +1,339 @@
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# Beer Song
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Write a program which produces the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall.
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Note that not all verses are identical.
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```plain
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99 bottles of beer on the wall, 99 bottles of beer.
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Take one down and pass it around, 98 bottles of beer on the wall.
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98 bottles of beer on the wall, 98 bottles of beer.
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Take one down and pass it around, 97 bottles of beer on the wall.
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97 bottles of beer on the wall, 97 bottles of beer.
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Take one down and pass it around, 96 bottles of beer on the wall.
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96 bottles of beer on the wall, 96 bottles of beer.
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Take one down and pass it around, 95 bottles of beer on the wall.
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95 bottles of beer on the wall, 95 bottles of beer.
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Take one down and pass it around, 94 bottles of beer on the wall.
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94 bottles of beer on the wall, 94 bottles of beer.
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Take one down and pass it around, 93 bottles of beer on the wall.
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93 bottles of beer on the wall, 93 bottles of beer.
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Take one down and pass it around, 92 bottles of beer on the wall.
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92 bottles of beer on the wall, 92 bottles of beer.
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Take one down and pass it around, 91 bottles of beer on the wall.
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91 bottles of beer on the wall, 91 bottles of beer.
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Take one down and pass it around, 90 bottles of beer on the wall.
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90 bottles of beer on the wall, 90 bottles of beer.
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Take one down and pass it around, 89 bottles of beer on the wall.
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89 bottles of beer on the wall, 89 bottles of beer.
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Take one down and pass it around, 88 bottles of beer on the wall.
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88 bottles of beer on the wall, 88 bottles of beer.
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Take one down and pass it around, 87 bottles of beer on the wall.
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87 bottles of beer on the wall, 87 bottles of beer.
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Take one down and pass it around, 86 bottles of beer on the wall.
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86 bottles of beer on the wall, 86 bottles of beer.
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Take one down and pass it around, 85 bottles of beer on the wall.
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85 bottles of beer on the wall, 85 bottles of beer.
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Take one down and pass it around, 84 bottles of beer on the wall.
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84 bottles of beer on the wall, 84 bottles of beer.
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Take one down and pass it around, 83 bottles of beer on the wall.
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83 bottles of beer on the wall, 83 bottles of beer.
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Take one down and pass it around, 82 bottles of beer on the wall.
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82 bottles of beer on the wall, 82 bottles of beer.
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Take one down and pass it around, 81 bottles of beer on the wall.
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81 bottles of beer on the wall, 81 bottles of beer.
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Take one down and pass it around, 80 bottles of beer on the wall.
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80 bottles of beer on the wall, 80 bottles of beer.
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Take one down and pass it around, 79 bottles of beer on the wall.
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79 bottles of beer on the wall, 79 bottles of beer.
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Take one down and pass it around, 78 bottles of beer on the wall.
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78 bottles of beer on the wall, 78 bottles of beer.
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Take one down and pass it around, 77 bottles of beer on the wall.
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77 bottles of beer on the wall, 77 bottles of beer.
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Take one down and pass it around, 76 bottles of beer on the wall.
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76 bottles of beer on the wall, 76 bottles of beer.
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Take one down and pass it around, 75 bottles of beer on the wall.
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75 bottles of beer on the wall, 75 bottles of beer.
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Take one down and pass it around, 74 bottles of beer on the wall.
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74 bottles of beer on the wall, 74 bottles of beer.
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Take one down and pass it around, 73 bottles of beer on the wall.
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73 bottles of beer on the wall, 73 bottles of beer.
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Take one down and pass it around, 72 bottles of beer on the wall.
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72 bottles of beer on the wall, 72 bottles of beer.
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Take one down and pass it around, 71 bottles of beer on the wall.
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71 bottles of beer on the wall, 71 bottles of beer.
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Take one down and pass it around, 70 bottles of beer on the wall.
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70 bottles of beer on the wall, 70 bottles of beer.
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Take one down and pass it around, 69 bottles of beer on the wall.
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69 bottles of beer on the wall, 69 bottles of beer.
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Take one down and pass it around, 68 bottles of beer on the wall.
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68 bottles of beer on the wall, 68 bottles of beer.
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Take one down and pass it around, 67 bottles of beer on the wall.
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67 bottles of beer on the wall, 67 bottles of beer.
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Take one down and pass it around, 66 bottles of beer on the wall.
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66 bottles of beer on the wall, 66 bottles of beer.
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Take one down and pass it around, 65 bottles of beer on the wall.
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65 bottles of beer on the wall, 65 bottles of beer.
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Take one down and pass it around, 64 bottles of beer on the wall.
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64 bottles of beer on the wall, 64 bottles of beer.
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Take one down and pass it around, 63 bottles of beer on the wall.
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63 bottles of beer on the wall, 63 bottles of beer.
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Take one down and pass it around, 62 bottles of beer on the wall.
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62 bottles of beer on the wall, 62 bottles of beer.
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Take one down and pass it around, 61 bottles of beer on the wall.
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61 bottles of beer on the wall, 61 bottles of beer.
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Take one down and pass it around, 60 bottles of beer on the wall.
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60 bottles of beer on the wall, 60 bottles of beer.
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Take one down and pass it around, 59 bottles of beer on the wall.
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59 bottles of beer on the wall, 59 bottles of beer.
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Take one down and pass it around, 58 bottles of beer on the wall.
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58 bottles of beer on the wall, 58 bottles of beer.
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Take one down and pass it around, 57 bottles of beer on the wall.
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57 bottles of beer on the wall, 57 bottles of beer.
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Take one down and pass it around, 56 bottles of beer on the wall.
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56 bottles of beer on the wall, 56 bottles of beer.
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Take one down and pass it around, 55 bottles of beer on the wall.
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55 bottles of beer on the wall, 55 bottles of beer.
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Take one down and pass it around, 54 bottles of beer on the wall.
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54 bottles of beer on the wall, 54 bottles of beer.
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Take one down and pass it around, 53 bottles of beer on the wall.
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53 bottles of beer on the wall, 53 bottles of beer.
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Take one down and pass it around, 52 bottles of beer on the wall.
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52 bottles of beer on the wall, 52 bottles of beer.
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Take one down and pass it around, 51 bottles of beer on the wall.
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51 bottles of beer on the wall, 51 bottles of beer.
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Take one down and pass it around, 50 bottles of beer on the wall.
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50 bottles of beer on the wall, 50 bottles of beer.
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Take one down and pass it around, 49 bottles of beer on the wall.
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49 bottles of beer on the wall, 49 bottles of beer.
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Take one down and pass it around, 48 bottles of beer on the wall.
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48 bottles of beer on the wall, 48 bottles of beer.
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Take one down and pass it around, 47 bottles of beer on the wall.
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47 bottles of beer on the wall, 47 bottles of beer.
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Take one down and pass it around, 46 bottles of beer on the wall.
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46 bottles of beer on the wall, 46 bottles of beer.
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Take one down and pass it around, 45 bottles of beer on the wall.
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45 bottles of beer on the wall, 45 bottles of beer.
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Take one down and pass it around, 44 bottles of beer on the wall.
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44 bottles of beer on the wall, 44 bottles of beer.
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Take one down and pass it around, 43 bottles of beer on the wall.
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43 bottles of beer on the wall, 43 bottles of beer.
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Take one down and pass it around, 42 bottles of beer on the wall.
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42 bottles of beer on the wall, 42 bottles of beer.
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Take one down and pass it around, 41 bottles of beer on the wall.
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41 bottles of beer on the wall, 41 bottles of beer.
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Take one down and pass it around, 40 bottles of beer on the wall.
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40 bottles of beer on the wall, 40 bottles of beer.
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Take one down and pass it around, 39 bottles of beer on the wall.
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39 bottles of beer on the wall, 39 bottles of beer.
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Take one down and pass it around, 38 bottles of beer on the wall.
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38 bottles of beer on the wall, 38 bottles of beer.
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Take one down and pass it around, 37 bottles of beer on the wall.
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37 bottles of beer on the wall, 37 bottles of beer.
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Take one down and pass it around, 36 bottles of beer on the wall.
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36 bottles of beer on the wall, 36 bottles of beer.
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Take one down and pass it around, 35 bottles of beer on the wall.
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35 bottles of beer on the wall, 35 bottles of beer.
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Take one down and pass it around, 34 bottles of beer on the wall.
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34 bottles of beer on the wall, 34 bottles of beer.
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Take one down and pass it around, 33 bottles of beer on the wall.
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33 bottles of beer on the wall, 33 bottles of beer.
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Take one down and pass it around, 32 bottles of beer on the wall.
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32 bottles of beer on the wall, 32 bottles of beer.
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Take one down and pass it around, 31 bottles of beer on the wall.
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31 bottles of beer on the wall, 31 bottles of beer.
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Take one down and pass it around, 30 bottles of beer on the wall.
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30 bottles of beer on the wall, 30 bottles of beer.
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Take one down and pass it around, 29 bottles of beer on the wall.
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29 bottles of beer on the wall, 29 bottles of beer.
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Take one down and pass it around, 28 bottles of beer on the wall.
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28 bottles of beer on the wall, 28 bottles of beer.
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Take one down and pass it around, 27 bottles of beer on the wall.
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27 bottles of beer on the wall, 27 bottles of beer.
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Take one down and pass it around, 26 bottles of beer on the wall.
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26 bottles of beer on the wall, 26 bottles of beer.
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Take one down and pass it around, 25 bottles of beer on the wall.
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25 bottles of beer on the wall, 25 bottles of beer.
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Take one down and pass it around, 24 bottles of beer on the wall.
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24 bottles of beer on the wall, 24 bottles of beer.
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Take one down and pass it around, 23 bottles of beer on the wall.
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23 bottles of beer on the wall, 23 bottles of beer.
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Take one down and pass it around, 22 bottles of beer on the wall.
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22 bottles of beer on the wall, 22 bottles of beer.
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Take one down and pass it around, 21 bottles of beer on the wall.
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21 bottles of beer on the wall, 21 bottles of beer.
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Take one down and pass it around, 20 bottles of beer on the wall.
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20 bottles of beer on the wall, 20 bottles of beer.
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Take one down and pass it around, 19 bottles of beer on the wall.
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19 bottles of beer on the wall, 19 bottles of beer.
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Take one down and pass it around, 18 bottles of beer on the wall.
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18 bottles of beer on the wall, 18 bottles of beer.
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Take one down and pass it around, 17 bottles of beer on the wall.
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17 bottles of beer on the wall, 17 bottles of beer.
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Take one down and pass it around, 16 bottles of beer on the wall.
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16 bottles of beer on the wall, 16 bottles of beer.
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Take one down and pass it around, 15 bottles of beer on the wall.
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15 bottles of beer on the wall, 15 bottles of beer.
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Take one down and pass it around, 14 bottles of beer on the wall.
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14 bottles of beer on the wall, 14 bottles of beer.
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Take one down and pass it around, 13 bottles of beer on the wall.
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13 bottles of beer on the wall, 13 bottles of beer.
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Take one down and pass it around, 12 bottles of beer on the wall.
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12 bottles of beer on the wall, 12 bottles of beer.
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Take one down and pass it around, 11 bottles of beer on the wall.
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11 bottles of beer on the wall, 11 bottles of beer.
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Take one down and pass it around, 10 bottles of beer on the wall.
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10 bottles of beer on the wall, 10 bottles of beer.
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Take one down and pass it around, 9 bottles of beer on the wall.
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9 bottles of beer on the wall, 9 bottles of beer.
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Take one down and pass it around, 8 bottles of beer on the wall.
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8 bottles of beer on the wall, 8 bottles of beer.
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Take one down and pass it around, 7 bottles of beer on the wall.
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7 bottles of beer on the wall, 7 bottles of beer.
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Take one down and pass it around, 6 bottles of beer on the wall.
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6 bottles of beer on the wall, 6 bottles of beer.
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Take one down and pass it around, 5 bottles of beer on the wall.
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5 bottles of beer on the wall, 5 bottles of beer.
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Take one down and pass it around, 4 bottles of beer on the wall.
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4 bottles of beer on the wall, 4 bottles of beer.
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Take one down and pass it around, 3 bottles of beer on the wall.
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3 bottles of beer on the wall, 3 bottles of beer.
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Take one down and pass it around, 2 bottles of beer on the wall.
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2 bottles of beer on the wall, 2 bottles of beer.
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Take one down and pass it around, 1 bottle of beer on the wall.
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1 bottle of beer on the wall, 1 bottle of beer.
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Take it down and pass it around, no more bottles of beer on the wall.
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No more bottles of beer on the wall, no more bottles of beer.
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Go to the store and buy some more, 99 bottles of beer on the wall.
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```
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## For bonus points
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Did you get the tests passing and the code clean? If you want to, these
|
||||
are some additional things you could try:
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|
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* Remove as much duplication as you possibly can.
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* Optimize for readability, even if it means introducing duplication.
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* If you've removed all the duplication, do you have a lot of
|
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conditionals? Try replacing the conditionals with polymorphism, if it
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applies in this language. How readable is it?
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|
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Then please share your thoughts in a comment on the submission. Did this
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experiment make the code better? Worse? Did you learn anything from it?
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To run the tests simply run the command `go test` in the exercise directory.
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If the test suite contains benchmarks, you can run these with the `-bench`
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flag:
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|
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go test -bench .
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For more detailed info about the Go track see the [help
|
||||
page](http://exercism.io/languages/go).
|
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|
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## Source
|
||||
|
||||
Learn to Program by Chris Pine [http://pine.fm/LearnToProgram/?Chapter=06](http://pine.fm/LearnToProgram/?Chapter=06)
|
||||
|
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## Submitting Incomplete Problems
|
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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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66
go/beer-song/beer.go
Normal file
66
go/beer-song/beer.go
Normal file
@@ -0,0 +1,66 @@
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package beer
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import (
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"errors"
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"strconv"
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"strings"
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)
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// buildBase builds the basic "x bottle(s) of beer"
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func buildBase(num int) string {
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var ret string
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if num == 0 {
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ret = "No more"
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} else {
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ret = strconv.Itoa(num)
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}
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ret += " bottle"
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if num != 1 {
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ret += "s"
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}
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ret += " of beer"
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return ret
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}
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// Verse generates a single verse
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func Verse(num int) (string, error) {
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var ret string
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if num > 99 || num < 0 {
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return "", errors.New("Invalid verse requested")
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}
|
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ret += buildBase(num) + " on the wall, " + strings.ToLower(buildBase(num)) + ".\n"
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if num == 0 {
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ret += "Go to the store and buy some more, " + buildBase(99) + " on the wall.\n"
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} else {
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ret += "Take "
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if num == 1 {
|
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ret += "it "
|
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} else {
|
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ret += "one "
|
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}
|
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ret += "down and pass it around, " + strings.ToLower(buildBase(num-1)) + " on the wall.\n"
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}
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return ret, nil
|
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}
|
||||
|
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// Verses generates all verses starting at 'st' and going to 'end'
|
||||
func Verses(st, end int) (string, error) {
|
||||
if st < end {
|
||||
return "", errors.New("Start less than stop")
|
||||
}
|
||||
var r, ret string
|
||||
var err error
|
||||
for i := st; i >= end; i-- {
|
||||
if r, err = Verse(i); err != nil {
|
||||
return "", err
|
||||
}
|
||||
ret += r + "\n"
|
||||
}
|
||||
return ret, nil
|
||||
}
|
||||
|
||||
// Song generates the entire song (all 100 verses)
|
||||
func Song() string {
|
||||
r, _ := Verses(99, 0)
|
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return r
|
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}
|
||||
139
go/beer-song/beer_test.go
Normal file
139
go/beer-song/beer_test.go
Normal file
@@ -0,0 +1,139 @@
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||||
package beer
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||||
|
||||
import (
|
||||
"testing"
|
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)
|
||||
|
||||
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"
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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"
|
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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()
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user