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epruniereprunier
committedApr 25, 2017
Beer song solution
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‎beer-song/README.md

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# Beer Song
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Produce 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
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are some additional things you could try:
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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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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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## Setup
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Go through the setup instructions for JavaScript to
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install the necessary dependencies:
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http://exercism.io/languages/javascript
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## Making the Test Suite Pass
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Execute the tests with:
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jasmine-node .
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In many test suites all but the first test have been skipped.
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Once you get a test passing, you can unskip the next one by
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changing `xit` to `it`.
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## Source
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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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‎beer-song/beer-song.js

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const BeerSong = function () {};
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BeerSong.prototype.verse = function (nVerse) {
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const before = `${nVerse > 0 ? nVerse : 'No more'} bottle${nVerse === 1 ? '' : 's'} of beer on the wall, ${nVerse > 0 ? nVerse : 'no more'} bottle${nVerse === 1 ? '' : 's'} of beer.`;
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let action = '';
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if (nVerse === 1) {
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action = 'Take it down and pass it around';
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} else if (nVerse === 0) {
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action = 'Go to the store and buy some more';
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} else {
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action = 'Take one down and pass it around';
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}
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let after = '';
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if (nVerse === 1) {
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after = 'no more bottles of beer on the wall.';
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} else {
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after = `${nVerse > 0 ? nVerse - 1 : 99} bottle${nVerse - 1 === 1 ? '' : 's'} of beer on the wall.`;
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}
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return `${before}\n${action}, ${after}\n`;
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};
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BeerSong.prototype.sing = function (start, end = 0) {
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let song = '';
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for (let i = start; i >= end; i--) {
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song += song ? '\n' : '';
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song += this.verse(i);
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}
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return song;
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};
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module.exports = BeerSong;

‎beer-song/beer-song.spec.js

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var BeerSong = require('./beer-song');
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describe('BeerSong', function() {
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var song = new BeerSong();
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it('prints an arbitrary verse', function() {
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var expected = '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';
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expect(song.verse(8)).toEqual(expected);
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});
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it('handles 2 bottles', function() {
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var expected = '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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expect(song.verse(2)).toEqual(expected);
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});
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it('handles 1 bottle', function() {
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var expected = '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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expect(song.verse(1)).toEqual(expected);
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});
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it('handles 0 bottles', function() {
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var expected = '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';
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expect(song.verse(0)).toEqual(expected);
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});
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it('sings several verses', function() {
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var expected = '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\n7 bottles of beer on the wall, 7 bottles of beer.\nTake one down and pass it around, 6 bottles of beer on the wall.\n\n6 bottles of beer on the wall, 6 bottles of beer.\nTake one down and pass it around, 5 bottles of beer on the wall.\n';
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expect(song.sing(8, 6)).toEqual(expected);
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});
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it('sings the rest of the verses', function() {
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var expected = '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\n2 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\n1 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\nNo 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';
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expect(song.sing(3)).toEqual(expected);
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});
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});

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