cookpad 2015 summer internship TDD

Transcript

1. TDD ͱ git Ͱ㕩Δ։ൃ
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 1
   

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2. git
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 2
   

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3. git
   • βοΫϦݴ͑͹ॻ͍ͨιʔείʔυͷཤྺΛ؅ཧͯ͘͠ΕΔιϑτ
   • ࠷ॳ͸ΤσΟλͷ undo ͷੌ͍΍ͭͩͱࢥͬͯஔ͚͹
   • ศརͳͷͰ༨༟͕Ͱ͖ͨΒ৭ʑௐ΂͓֮ͯ͑ͯ͘ͱྑ͍
   • github ͱ͔ฉ͍ͨ͜ͱ͋Δͱࢥ͏͚ͲɺͱΓ͋͑ͣؾʹ͢ΔͳɻWiki ͱ Wikipedia ͘Β
   ͍ͷҧ͍͕͋Δ
   • ʢ׬શʹؔ܎ͳ͍ͱ͸ݴΘͳ͍͕ಉҰࢹͯ͠͸͍͚ͳ͍ʣ
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 3
   

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4. git
   ͱΓ֮͋͑ͣ͑Δ΂͖ίϚϯυ
   - add
   - มߋΛ൓өͤ͞Δ
   - commit
   - ൓өͨ͠มߋΛอଘ͢Δ
   - push
   - ϦϞʔτʹஔ͘
   - pull
   - ϦϞʔτ͔Β࣋ͬͯ͘Δ
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 4
   

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5. TDD
   ςετۦಈ։ൃ
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 5
   

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6. TDD
   ςετۦಈ։ൃ
   ։ൃख๏
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 6
   

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7. TDD
   ςετۦಈ։ൃ
   ։ൃख๏ → ςετख๏Ͱ͸ͳ͍
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 7
   

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8. TDD
   • ࠓճ͸ςετϑΝʔετΛ΍ͬͯΈ·͢
   • कഁ཭ͷकͷ෦෼ͩͱࢥͬͯ΍ͬͯΈ·͠ΐ͏
   • Զ΋݁ߏະͩʹςετϑΝʔετͰॻ͘͜ͱ͕ଟ͍Ͱ͢
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 8
   

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9. TDD & git
   ͬͦ͘͞खΛಈ͔͍͖֮ͯ͑ͯ͠·͠ΐ͏
   2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 9
   

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10. ՝୊: ԕ͍ੈքͷ਺ࣜ1
    ܅ͷ஌Βͳ͍ԕ͍ੈքͷ਺ࣜΛධՁͯ͠΋Β͏ɻ ਺ࣜ͸ 4*5+6&7|8 ͷΑ͏ͳܗʹͳ͍ͬͯΔɻ ۮવʹ΋ɺ
    ԋࢉࢠͷҙຯ͸ ruby ͷ֤ԋࢉࢠͷҙຯͱಉ͡ͳΜ͚ͩͲɺ༏ઌॱҐ͸ ruby ͱ͸ҟͳΔͷͰͦͷ·· eval
    ͢ΔΘ͚ʹ͸͍͔ͳ͍ɻ ԋࢉࢠͷ༏ઌॱҐ͸Լදͷ௨ΓɻҰԠҙຯ΋ॻ͍͚ͨͲɺҙຯ͸ ruby ͱಉ͡ɻ
    ↑ ༏ઌॱҐߴ
    | Ϗοτ or
    & Ϗοτ and
    + Ճࢉ
    * ৐ࢉ
    ↓ ༏ઌॱҐ௿
    1 http://nabetani.sakura.ne.jp/kanagawa.rb/evalex/
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 10
    

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11. ·ͣ͸؀ڥͷ֬ೝ
    calculator_spec.rb
    describe "calculator" do
    it { expect(true).to be true }
    end
    ࣮ߦͯ͠ΈΑ͏
    $ rspec calculator_spec.rb
    calculator
    should equal true
    Finished in 0.00191 seconds (files took 0.19241 seconds to load)
    1 example, 0 failures
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 11
    

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12. ·ͣ͸؀ڥͷ֬ೝ
    ͜ΕʹΑͬͯ෼͔Δ͜ͱ
    1. rspec ίϚϯυʹ path ͕௨͍ͬͯΔ
    1. ·ͣ͸؀ڥͷςετʹͳΔ
    2. ࣮͸؀ڥ͕੔͍ͬͯͳ͍ͱ͔Α͋͘Δ
    2. ࣮ࡍʹ࣮ߦͯ͠ΤϥʔʹͳΒͳ͍
    1. ϕʔεͷίʔυ͕ؒҧ͍͑ͯͳ͍ࣄ͕Θ͔Δ
    2. ࣮͸ผͷϑΝΠϧ࣮ߦͯͨ͠ͱ͔Α͋͘Δ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 12
    

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13. ·ͣ͸؀ڥͷ֬ೝ
    ͜͜ͰҰ୴ίϛοτ
    $ git init
    Initialized empty git repository in /path/to/your/dir/.git/
    $ git add calculator_spec.rb
    $ git commit -m "init"
    [master (root-commit) 1f3ad9b] init
    1 file changed, 3 insertions(+)
    create mode 100644 calculator_spec.rb
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 13
    

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14. ͔͜͜Β͖͞͸جຊతʹ
    • ςετ͕ green
    • ࣮૷ίʔυͷϦϑΝΫλϦϯά͔ςετίʔυͷ ௥Ճ ͷ
    Έ
    • ςετ͕ red
    • ࣮૷ίʔυ͔͠࿔Βͳ͍
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 14
    

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15. ͔͜͜Β͖͞͸جຊతʹ
    • άνϟάνϟʹͳͬͯΑ͘෼͔Βͳ͘ͳͬͨΒ
    • git reset --hard HEAD
    • Ͱɺίϛοτͨ͠ͱ͜Ζ·Ͱ໭ͤ·͢
    • ࠓճ͸ Path ͱ͔Ͱ೰Ήͷຊ࣭Ͱ͸ͳ͍ͷͰҰͭͷϑΝΠϧͰ
    ΍Γ·͢
    • ී௨͸ςετίʔυͱ࣮૷ίʔυͷϑΝΠϧΛΘ͚·͢
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 15
    

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16. ࠷ॳͷ࣮૷
    ·ͣ͸ςετΛίέͤ͞Δ
    describe "calculator" do
    it "15*5 = 75" do
    expect(calc("15*5")).to eq 75
    end
    end
    ࣮ߦͯ͠ΈΔͱίέ·͢ɻ
    ʮcalc ͳΜͯϝιουແ͍ΑʯͱౖΒΕΔͷͰ calc ͱ͍͏ϝιουΛ࣮
    ૷ͯ͠Έ·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 16
    

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17. ࠷ॳͷ࣮૷
    red ʹͳͬͨͷͰ࣮૷ίʔυΛ࿔Δ
    ςετ͕௨ΔΑ͏ʹ
    def calc(expression)
    75
    end
    describe "calculator" do
    it "15*5 = 75" do
    expect(calc("15*5")).to eq 75
    end
    end
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 17
    

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18. !?
    def calc(expression)
    75
    end
    75 Λฦ͍ͯ͠ΔͷഅࣛΈ͍ͨʁ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 18
    

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19. ࠷ॳͷ࣮૷
    ͜ΕʹΑͬͯ෼͔Δ͜ͱ
    Ծ࣮૷ ͱ͍ΘΕͨΓ͢Δ
    1. green ʹͳΔ͜ͱΛ֬ೝ͢Δ
    • ظ଴͍ͯ͠Δͱ͓Γʹςετ͕ಈ͍͍ͯΔ͜ͱͷ֬ೝ
    • ςετίʔυͷςετʹͳΔ
    2. ࣗ෼͕ฤू͍ͯ͠ΔϑΝΠϧʹؒҧ͍ͳ͍
    • ࣗ෼͕৮ͬͯΔϑΝΠϧΛצҧ͍ͯ͠Δͱ͔Α͋͘Δ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 19
    

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20. ࠷ॳͷ࣮૷
    ͜͜ͰҰ୴ green ʹͳͬͨͷͰίϛοτ͓͖ͯ͠·͠ΐ͏
    • ࠓ͔ΒϦϑΝΫλϦϯάʹೖΔͷͰ͍ͭͰ΋໭ΕΔΑ͏ʹ
    • ͋ͱͰ্ॻ͖ͯ͠ཤྺ͔Β͸ຣফ͠·͢ɻ
    • ޙͰ rebase ౳Ͱ·ͱΊΔલఏͰࡉ͔͘ίϛοτͪ͠Ό͏
    ͷ΋Φεεϝ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 20
    

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21. Q.1
    ϦϑΝΫλϦϯά
    Ծ࣮૷Ͱ͸ͳ࣮͘ࡍͷ࣮૷Λͯ͠Έ·͠ΐ͏ʢ5 ෼ʣ
    def calc(expression)
    # ίίʹ࣮૷Λॻ͘
    end
    describe "calculator" do
    it "15*5 = 75" do
    expect(calc("15*5")).to eq 75
    end
    end
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 21
    

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22. ࠷ॳͷ࣮૷
    ྫ
    def calc(expression)
    result = nil
    expression.scan(/\d+/).each do|num|
    if result
    result = result * num.to_i
    else
    result = num.to_i
    end
    end
    result
    end
    • green ΛΩʔϓ͍ͯ͠Δ͜ͱ
    • ઈରʹςετίʔυΛ࿔Βͳ͍
    • ඞཁҎ্ͷࣄ͸͠ͳ͍
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 22
    

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23. ࠷ॳͷ࣮૷
    ͜͜Ͱ ίϛοτ
    $ git add -p
    ϦϑΝΫλϦϯάͨ͠෼͚ͩͳͷΛ֬ೝ
    $ git commit --amend
    Ծ࣮૷ͷίϛοτʹ্ॻ͖ͯ͠ίϛοτ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 23
    

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24. ࣍ͷ࣮૷
    ςετΛ·ͣ௥Ճ͠·͢
    describe "calculator" do
    it "15*5 = 75" do
    expect(calc("15*5")).to eq 75
    end
    it "15+5 = 20" do
    expect(calc("15+5")).to eq 20
    end
    end
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 24
    

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25. ࣍ͷ࣮૷
    1) calculator 15+5 = 20
    Failure/Error: expect(calc("15+5")).to eq 20
    expected: 20
    got: 75
    (compared using ==)
    # ./calculator_spec.rb:11:in `block (2 levels) in '
    15 + 5 Ͱ 20 Λظ଴͚ͨ͠Ͳ 75 ͕ฦ͖ͬͯͨͱݴ͍ͬͯ·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 25
    

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26. ࣍ͷ࣮૷
    ͜ΕʹΑͬͯ෼͔Δ͜ͱ
    1. ৽͍͠མͪΔςετΛ௥Ճ
    - ςετίʔυͷςετ
    - ͜Ε͕མͪͳ͔ͬͨΒΦΧγΠ
    2. ݩͷςετ͸੒ޭ͍ͯ͠Δ͜ͱΛ֬ೝ
    - ଞΛյ͍ͯ͠ͳ͍͜ͱΛอূ
    15 + 5 Ͱ 20 Λظ଴͚ͨ͠Ͳ 75 ͕ฦ͖ͬͯͨͱݴΘΕͨͷͰ 20 ͕ฦΔ
    Α͏ʹ͠·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 26
    

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27. ࣍ͷ࣮૷
    ·ͨԾ࣮૷Λ͠·͢
    def calc(expression)
    result = nil
    expression.scan(/\d+/).each do|num|
    if result
    if expression.include?("*")
    result = result * num.to_i
    else
    result = result + num.to_i
    end
    else
    result = num.to_i
    end
    end
    result
    end
    ࠓ౓͸ςετ௨Γ·͢
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 27
    

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28. ࣍ͷ࣮૷
    ͜ΕʹΑͬͯ෼͔Δ͜ͱ
    1. ςετ͸ظ଴௨Γʹಈ͍͍ͯΔ
    • ςετίʔυͷςετ
    ͳͷͰ͜͜Ͱίϛοτͯ͠ϦϑΝΫλϦϯάʹೖΓ·͢
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 28
    

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29. ࣍ͷ࣮૷
    ϦϑΝΫλϦϯάྫ
    def calc(expression)
    result = nil
    op = expression.scan(/\*|\+/).first
    expression.scan(/\d+/).each do|num|
    if result
    case op
    when "*"
    result = result * num.to_i
    else
    result = result + num.to_i
    end
    else
    result = num.to_i
    end
    end
    result
    end
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 29
    

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30. ୤ઢ: Ruby ͷ࿩
    "15+5".scan(/\d+/) #=> ["15", "5"]
    "15+5".send("scan", /\d+/) #=> ["15", "5"]
    ϝιουݺͼग़͠͸ send ϝιουʹจࣈྻͰϝιου໊Λ౉
    ͢͜ͱͰߦ͏͜ͱ΋ग़དྷ·͢ɻ(ϝιουͷҾ਺͸ୈೋҾ਺Ҏ߱
    ʹฒ΂·͢ʣ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 30
    

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31. ୤ઢ: Ruby ͷ࿩
    10 + 5 #=> 15
    10.+(5) #=> 15
    ԋࢉࢠ΋࣮͸ϝιουͰ͢ɻʢ਺ࣈͷΦϒδΣΫτʹରͯ͠ +
    ͬͯϝιουΛݺΜͰ͍·͢ʣ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 31
    

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32. ୤ઢ: Ruby ͷ࿩
    ίϨΛ૊Έ߹Θͤͯߟ͑Δͱ
    10 + 5 #=> 15
    ͸
    10.send("+",5) #=> 15
    ͬͯॻ͚·͢
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 32
    

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33. ୤ઢ: Ruby ͷ࿩
    ͱ͍͏͜ͱ͸
    case op
    when "*"
    result = result * num.to_i
    else
    result = result + num.to_i
    end
    ͱॻ͍ͨ෦෼͸
    result = result.send(op, num.to_i)
    ͱॻ͚·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 33
    

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34. ୤ઢ: Ruby ͷ࿩
    def calc(expression)
    result = nil
    op = expression.scan(/\*|\+/).first
    expression.scan(/\d+/).each do|num|
    if result
    result = result.send(op, num.to_i)
    else
    result = num.to_i
    end
    end
    result
    end
    ςετ͕௨ͬͯΔ͜ͱΛ֬ೝͯ͠ίϛοτ͠·͠ΐ͏
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 34
    

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35. ୤ઢ: Ruby ͷ࿩
    Array#map ͱ͍͏ཁૉͷ਺͚ͩ܁Γฦ͠ϒϩοΫΛ࣮ߦͯ͠ϒ
    ϩοΫͷ໭Γ஋ΛूΊͨ഑ྻΛ࡞੒ͯ͠ฦ͢ϝιου͕͋Γ·
    ͢ɻ
    [1, 2, 3].map {|i| i + 5 } #=> [6, 7, 8]
    ["1", "2", "3"].map {|i| i.to_i } #=> [1, 2, 3]
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 35
    

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36. ୤ઢ: Ruby ͷ࿩
    ͦͯ͠୯७ͳϝιουݺͼग़͠ͷ࣌͸
    ["1", "2", "3"].map {|i| i.to_i } #=> [1, 2, 3]
    ["1", "2", "3"].map(&:to_i) #=> [1, 2, 3]
    ͱॻ͚·͢3ɻ
    3 Կނͦ͏ͳΔͷ͔ڵຯͷ͋Δਓ͸ Symbol#to_proc Λௐ΂ͯΈ·͠ΐ͏
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 36
    

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37. ୤ઢ: Ruby ͷ࿩
    ͱ͍͏͜ͱ͸
    expression.scan(/\d+/)
    ͱॻ͍͍ͯͨ෦෼Λ
    expression.scan(/\d+/).map(:to_i)
    ͱ͓ͯ͘͠ͱຖճ to_i Λݺ͹ͳͯ͘Α͘ͳΓ·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 37
    

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38. ୤ઢ: Ruby ͷ࿩
    def calc(expression)
    result = nil
    op = expression.scan(/\*|\+/).first
    expression.scan(/\d+/).map(&:to_i).each do|num|
    if result
    result = result.send(op, num)
    else
    result = num
    end
    end
    result
    end
    ςετ͕௨ͬͯΔ͜ͱΛ֬ೝͯ͠ίϛοτ͠·͠ΐ͏
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 38
    

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39. ୤ઢ: Ruby ͷ࿩
    Enumerable#inject ϝιουͱ͍͏΋ͷ͕͋ΓϒϩοΫΛ࢖ͬͯ
    ܁Γฦ͠ܭࢉΛߦ͏ͷʹ࢖͍·͢ɻϒϩοΫʹॱʹʮཁૉ1ɺཁ
    ૉ2ʯɺʮϒϩοΫͷલճͷ໭Γ஋ɺཁૉ3ʯɺʮϒϩοΫͷલճ
    ͷ໭Γ஋ɺཁૉ4ʯɺ...Λ౉͠·͢ɻϝιουͷ໭Γ஋͸ϒϩο
    Ϋ͕࠷ޙʹฦͨ͠஋ʹͳΓ·͢ɻ
    (೔ຊޠͷઆ໌ಡΉΑΓαϯϓϧݟͨ΄͏͕Θ͔Γ΍͍͢Ͱ͆͢ʣ
    [1, 2, 3].inject {|sum, num| sum + num } #=> 6
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 39
    

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40. ୤ઢ: Ruby ͷ࿩
    ͞Βʹ͖ͬ͞ग़͖ͯͨ map ͱಉ͘͡
    ["1", "2", "3"].map {|i| i.to_i } #=> [1, 2, 3]
    ["1", "2", "3"].map(&:to_i) #=> [1, 2, 3]
    ↓ ͷΑ͏ʹॻ͚·͢
    [1, 2, 3].inject {|sum, num| sum + num } #=> 6
    [1, 2, 3].inject(&:+) #=> 6
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 40
    

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41. ୤ઢ: Ruby ͷ࿩
    ϦϑΝΫλϦϯάྫ
    def calc(expression)
    op = expression.scan(/\*|\+/).first
    expression.scan(/\d+/).map(&:to_i).inject(&op.to_sym)
    end
    ςετ͕௨ͬͯΔ͜ͱΛ֬ೝͯ͠ίϛοτ͠·͢
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 41
    

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42. ໌നͳ࣮૷
    ࠓͷ࣮૷Ͱ "15&5" ͱ "15|5" ʹ΋؆୯ʹରԠͰ͖ͦ͏Ͱ͢ɻ
    ͜͏͍͏࣌͸Ծ࣮૷Λল͍࣮ͯ૷ͯ͠͠·͍·͠ΐ͏ɻ
    ΍͸Γ·ͣ͸ςετΛॻ͖·͢
    it "15&5 = 5" do
    expect(calc("15&5")).to eq 5
    end
    it "15|5 = 15" do
    expect(calc("15|5")).to eq 15
    end
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 42
    

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43. ໌നͳ࣮૷
    ࣮ߦͯ͠ςετ͕ίέΔ͜ͱΛ֬ೝ͠·͠ΐ͏
    େࣄ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 43
    

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44. େࣄ
    ͜ͷλΠϛϯάͰςετΛ͓ͯ͘͜͠ͱ͸͘͢͝େࣄͰ͢ɻ
    େମ͜͏͍͏ʮ͓ɺ༨༟ͰͰ͖ͦ͏ʯͬͯ࣌ʹݶͬͯίϐϖϛεͳͲͰςε
    τ͕ؒҧ͍͑ͯΔ͜ͱͳͲ͕͋Γ·͢ɻ
    ͦͯ͠ɺେମͦ͏͍͏ͩ͘Βͳ͍ϋϚΓํͰ࣌ؒΛ࢖ͬͯ͠·ͬͨΓ͠·
    ͢ɻ
    ࠓͷ͏ͪʹ·ͣ͸ςετίʔυͷਖ਼͠͞Λ֬ೝ͢ΔบΛ͚͓͖ͭͯ·͠ΐ
    ͏ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 44
    

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45. ໌നͳ࣮૷
    Ͱ͸ࠓճ͸Ծ࣮૷ͳ͠Ͱ࣮૷ͪ͠Ό͍·͢ɻ
    def calc(expression)
    op = expression.scan(/\*|\+|\&|\|/).first
    expression.scan(/\d+/).map(&:to_i).inject(&op.to_sym)
    end
    ςετ͕௨Δ͜ͱΛ֬ೝͯ͠ίϛοτ͠·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 45
    

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46. ߋʹ࣍΁
    ࣍ʹԿΛ࣮૷͢Δ͔Λߟ͑·͢ɻ
    ݱࡏͷ࢒࡞ۀΛߟ͑Δͱ
    1. ԋࢉࢠ͕ࠞࡏ͍ͯ͠Δ࣌ͷॲཧ
    2. ԋࢉࢠͷ༏ઌॱҐͷॲཧ
    ͕࢒͍ͬͯ·͢ɻ
    2 ͸̍ΛऴΘΒͤͳ͍ͱ࣮૷Ͱ͖ͦ͏ʹͳ͍ͷͰઌʹ 1 Λ࣮૷͠
    ·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 46
    

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47. ߋʹ࣍΁
    ԋࢉࢠ͕ࠞࡏ͍ͯ͠Δ࣌ͷॲཧ Λ࣮૷͢Δ͜ͱʹܾΊͨͷͰɺద੾
    ͳςετΛબͼ·͢ɻ
    1. ԋࢉࢠ͕ෳ਺ࠞࡏ͍ͯͯ͠
    2. ༏ઌॱҐΛؾʹ͠ͳ͍Ͱྑ͍ʢࠨ͔Βܭࢉ͢Ε͹ྑ͍ʣ
    ΋ͷΛ୳͠·͢ɻ
    αϯϓϧσʔλ1ͷ #9 "30+15*5" ͕ྑͦ͞͏Ͱ͢ɻ
    1 http://nabetani.sakura.ne.jp/kanagawa.rb/evalex/
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 47
    

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48. ߋʹ࣍΁
    ςετΛ௥Ճ͠མͪΔ͜ͱΛ֬ೝ͠·͢
    it "30+15*5 = 225" do
    expect(calc("30+15*5")).to eq 225
    end
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 48
    

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49. ߋʹ࣍΁
    Ծ࣮૷͠·͢
    def calc(expression)
    return 225 if expression == "30+15*5"
    op = expression.scan(/\*|\+|\&|\|/).first
    expression.scan(/\d+/).map(&:to_i).inject(&op.to_sym)
    end
    ςετ͕௨Δ͜ͱΛ֬ೝ͠·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 49
    

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50. ߋʹ࣍΁
    def calc(expression)
    op = expression.scan(/\*|\+|\&|\|/)
    expression.scan(/\d+/).map(&:to_i).inject do|sum, n|
    sum.send(op.shift, n)
    end
    end
    ςετ͕௨ͬͨΒίϛοτ͠·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 50
    

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51. ׬੒΁
    Ͱ͸ɺ࠷ޙʹ࢒ͬͨʮԋࢉࢠͷ༏ઌॱҐͷॲཧʯΛ࣮૷ͯ͠Έ
    ·͠ΐ͏ɻ
    αϯϓϧσʔλ1ͷ #6 "30*15+5" ͕ྑͦ͞͏Ͱ͢ɻ
    ࠓ·Ͱͱಉ͡Α͏ʹςετΛ௥Ճ͠མͪΔ͜ͱΛ֬ೝ͠·͢ɻ
    it "30*15+5 = 600" do
    expect(calc("30*15+5")).to eq 600
    end
    1 http://nabetani.sakura.ne.jp/kanagawa.rb/evalex/
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 51
    

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52. ׬੒΁
    ࣍ͷ࣮૷Λߟ͑ͯΈ·͠ΐ͏……
    it "30*15+5 = 600" do
    expect(calc("30*15+5")).to eq 600
    end
    ͪΐͬͱ 5 ෼΄ͲɺίϨ͕௨ΔΑ͏ʹߟ͑ͯΈ͍ͯͩ͘͞ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 52
    

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53. ׬੒΁
    Ͳ͏΍Βࠓ·ͰͷΑ͏ʹ୯७ʹϧʔϓॲཧʹ೚ͤͯܭࢉ͢ΔͷͰ͸͏·͘ߦ͔
    ͳͦ͏Ͱ͢ɻ
    Ұ୴΋͏ͪΐͬͱ؆୯ͳςετ͔Β࢝Ίͨ΄͏͕ྑͦ͞͏Ͱ͢ɻ
    ͜ͷςετ͸ pending ʹ͠·͢ɻ
    it "30*15+5 = 600" do
    pending("unimplemented")
    expect(calc("30*15+5")).to eq 600
    end
    ࣮ߦͯ͠ pending ʹͳ͍ͬͯΔ͜ͱΛ֬ೝ͠·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 53
    

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54. ׬੒΁
    ۩ମతʹ͸Ͳ͏΍ͬͯܭࢉ͍ͯ͘͠ͷ͔ߟ͑ͯΈ·͢ɻ
    30*15+5 -> 30*20 -> 600
    ϓϩάϥϜͰѻ͏ࣄΛߟ͑ͯ Array ʹͯ͠
    ["30", "*", "15", "+", "5"]
    ["30", "*", "20"]
    ["600"]
    ͱܭࢉ͍ͯ͘͠Α͏ʹ͢Ε͹ྑͦ͞͏Ͱ͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 54
    

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55. ׬੒΁
    ͱΓ͋͑ͣ࠷ॳͷҰาΛผͷϝιουͰ࣮૷ͯ͠Έ·͠ΐ͏ɻ
    it "30*15+5 -> 30*20" do
    expect(_calc(["30", "*", "15", "+", "5"])).to eq ["30", "*", "20"]
    end
    ্هΛ௨ΔΑ͏ͳίʔυΛ·ͣ͸ॻ͍ͯΈ·͠ΐ͏ɻ
    ʢ5෼ ׬੒͠ͳͯ͘΋͍͍Ͱ͢ʣ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 55
    

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56. ׬੒΁
    టष͘ॻ͍ͯΈ·ͨ͠
    def _calc(expressions)
    pos = expressions.index("+")
    operator = expressions[pos]
    left = expressions[pos-1].to_i
    right = expressions[pos+1].to_i
    res = left.send(operator, right)
    expressions[pos-1..pos+1] = res.to_s
    expressions
    end
    ͜ͷॲཧΛԋࢉࢠͷ༏ઌ౓ॱʹߦ͑͹ग़དྷͦ͏Ͱ͢ɻ
    ͱΓ͋͑ͣίϛοτ͓͖ͯ͠·͢ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 56
    

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57. ׬੒΁
    Q.2
    ઌ΄Ͳͷ pending ʹͨ͠ςετ͕௨Δ4Α͏ʹ
    ࣮૷Λͯ͠Έ·͠ΐ͏ʢ45 ෼ʣ
    it "30*15+5 = 600" do
    pending("unimplemented")
    expect(calc("30*15+5")).to eq 600
    end
    ͍͖ͳΓ্هςετ௨ΔΑ͏ʹ͢ΔͷͰ͸ͳ͘
    ͖ͬ͞ͷΑ͏ʹগͮͭ͠ςετΛॻ͍ͯҰาͮͭਐΜͰΈ·͠ΐ͏ɻ
    4 ϖϯσΟϯάʹ͍ͯͨ͠ςετ͕௨Δͱ΋͏ϖϯσΟϯάͰ͸ͳ͍ͱදͨ͢Ίʹ੺͘ͳΔͷͰ pending Λফ͠·͠ΐ͏ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 57
    

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58. ͕࣍શͯ௨ΔࣄΛ֬ೝͯ͠Έ·͠ΐ͏2
    describe "all" do
    it do
    [
    [ 0, "4*5+6&7|8", "44" ],
    [ 1, "15*5", "75" ],
    [ 2, "15+5", "20" ],
    [ 3, "15&5", "5" ],
    [ 4, "15|5", "15" ],
    [ 5, "30*15*5", "2250" ],
    [ 6, "30*15+5", "600" ],
    [ 7, "30*15&5", "150" ],
    [ 8, "30*15|5", "450" ],
    [ 9, "30+15*5", "225" ],
    [ 10, "30+15+5", "50" ],
    [ 11, "30+15&5", "35" ],
    [ 12, "30+15|5", "45" ],
    [ 13, "30&15*5", "70" ],
    [ 14, "30&15+5", "19" ],
    [ 15, "30&15&5", "4" ],
    [ 16, "30&15|5", "14" ],
    [ 17, "30|15*5", "155" ],
    [ 18, "30|15+5", "36" ],
    [ 19, "30|15&5", "5" ],
    [ 20, "30|15|5", "31" ],
    [ 21, "1+2+3+4+5+6+7+8+9+10", "55" ],
    [ 22, "1*2*3*4*5*6*7*8*9*10", "3628800" ],
    [ 23, "1+2+3+4+5*6+7+8+9+10", "600" ],
    [ 24, "1*2*3*4*5+6*7*8*9*10", "1330560" ],
    [ 25, "1|2|4|8|16|32|64|128|256|512", "1023" ],
    [ 26, "2046&2045&2043&2039&2031&2015&1983&1919&1791&1535", "1024" ],
    [ 27, "0+1|7*6", "42" ],
    [ 28, "6|4+2&9+4", "10" ],
    [ 29, "0&6+1&6|4*2", "0" ],
    [ 30, "4|4*7+7+4&9", "56" ],
    [ 31, "9&8*2+3*1|2|7", "280" ],
    [ 32, "230+83*751&176", "50080" ],
    [ 33, "89+62465*94&84", "5254536" ],
    [ 34, "668&925+398*562", "599092" ],
    [ 35, "15|9+348*302&23&77", "1452" ],
    [ 36, "3&3&6|7+3|5*3|2&4*4", "0" ],
    [ 37, "7*6|7|7*1&7|7&3&8*3", "0" ],
    [ 38, "896+316*209*264&728", "2026464" ],
    [ 39, "1844+41*64|7906|66842", "138965970" ],
    [ 40, "2&41&6884*69857+68083", "0" ],
    [ 41, "2+3*9*3|6|7&0+3+3*6&8", "0" ],
    [ 42, "895+400*988|549&237+488", "938875" ],
    [ 43, "30*48&99036+140&33+75|645", "22050" ],
    [ 44, "278+2033+53*96*56|3303|3&14", "3177216" ],
    [ 45, "5380&27|643*2+1888&74+30|16", "0" ],
    [ 46, "0&3845+6645*4293+78&78*3102|9|3", "90127550385" ],
    [ 47, "78&44956&67*974|413+13237*5588|54*668", "0" ],
    [ 48, "500*206+145|167|163|465&668+662+806*681&458", "123896000" ],
    [ 49, "82+14&0*344+34+542916&18*11|844|64*873223|840993", "23813260003764" ],
    [ 50, "374958|6727+53965&53*954&29|6*138572+59|547783&43*8998", "12178274756590800" ],
    ].each do |q|
    expect(calc(q[1])).to eq q[2].to_i
    end
    end
    2 https://gist.github.com/yoshiori/87238f1e229baab94a7b
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 58
    

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59. ྫ
    def calc(expression)
    result = expression.scan(/\*|\+|\&|\||\d+/)
    %w(| & + *).each do |op|
    while result.include? op
    pos = result.index(op)
    res = result[pos-1].to_i.send(op, result[pos+1].to_i)
    result[pos-1..pos+1] = res
    end
    end
    result.first
    end
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 59
    

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60. ࠷ॳʹग़͞Ε͓ͨ୊
    ܅ͷ஌Βͳ͍ԕ͍ੈքͷ਺ࣜΛධՁͯ͠΋Β͏ɻ ਺ࣜ͸
    4*5+6&7|8 ͷΑ͏ͳܗʹͳ͍ͬͯΔɻ ۮવʹ΋ɺԋࢉࢠͷҙຯ
    ͸ ruby ͷ֤ԋࢉࢠͷҙຯͱಉ͡ͳΜ͚ͩͲɺ༏ઌॱҐ͸ ruby
    ͱ͸ҟͳΔͷͰͦͷ·· eval ͢ΔΘ͚ʹ͸͍͔ͳ͍ɻ ԋࢉࢠͷ
    ༏ઌॱҐ͸Լදͷ௨ΓɻҰԠҙຯ΋ॻ͍͚ͨͲɺҙຯ͸ ruby ͱ
    ಉ͡ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 60
    

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61. ࣮ࡍʹ๻Β͕࠷ॳʹ΍ͬͨࣄ
    15*5 Λ 75 ʹ͢Δ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 61
    

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62. ࠓճͷ՝୊
    1. େ͖͍໰୊Λখ͘͞෼ׂ͢Δ
    2. ໰୊Λ 1 ͭͣͭղ͍͍ͯ͘
    3. ͦΕΛTDD Ͱ㕩͍ͯ͘͠
    Λߦ͍·ͨ͠ɻ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 62
    

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63. TDD
    ͓͞Β͍
    • ςετ͕૝ఆ௨Γ͔֬ೝ͢Δ͜ͱ͕େࣄ
    • red ͕ѱ͍ɺgreen ͕ྑ͍ͷͰ͸ͳ͍
    • red ʹͳΔ΂͖ςετ͕ red ʹͳΓɺgreen ʹͳΔ΂͖ςετ͕ green ʹͳ͍ͬͯΔ͜ͱ͕େࣄ
    • ͦΕΛૉૣ֬͘ೝ͢ΔͨΊͷԾ࣮૷
    • ςετίʔυͷςετʹͳΔ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 63
    

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64. TDD
    ͓͞Β͍
    1. ࠷ॳʹ red ʹ͢Δ
    2. ࠷଎Ͱ green ʹ͢Δ
    • ͜͜·Ͱ͸ςετίʔυͷςετ
    3. ϦϑΝΫλϦϯά͢Δ
    • ͕͜͜ຊؾͷ࣮૷
    • ଟ෼ΈΜͳ͕ීஈ૝૾͢Δʢେن໛ͳʣϦϑΝΫλϦϯάͱ͸গ͠ײ͕֮ҧ͏
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 64
    

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65. red green refactor
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 65
    

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66. ·ͱΊ
    1. େ͖͍໰୊Λখ͘͞෼ׂ͢Δ
    2. ໰୊Λ 1 ͭͣͭղ͍͍ͯ͘
    3. ͦΕΛ㕩͍ͯ͘͠
    1. ·ͣ͸མͪΔςετΛॻ͘
    2. ςετ͕௨ΔҰ൪؆୯ͳ࣮૷Λॻ͘ʢԾ࣮૷ɺ໌നͳ࣮૷ʣ
    3. ϦϑΝΫλϦϯά͢Δ
    2015/08/20 TDD ͱ git Ͱ㕩Δ։ൃ 66
    

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