1. 惚れちゃうコード
小林せかい（クックパッド, Asakusa.rb）

2. What is ?
!
more smart,
more like Ruby

3. case 1

4. before
def self.same_record?(data1, data2)
return false unless data1.arg1 == data2.arg1
return false unless data1.arg2 == data2.arg2
return false unless data1.arg3 == data2.arg3
return false unless data1.arg4 == data2.arg4
true
end
!
!

5. after
def same_record?(data1)
self.arg1 == data2.arg1 &&
self.arg2 == data2.arg2 &&
self.arg3 == data2.arg3 &&
self.arg4 == data2.arg4
end
!
!
!

6. case 2

7. before
!
let(:users) { [user1, user2, user3] }
!
let(:user1) {
a = User.new(user_id: 111, name: ‘Taro’);a.save(validate: false)};a
}
!
let(:user2) {
a = User.new(user_id: 222, name: ‘Jiro’);a.save(validate: false)}; a
}
!
# NG (return boolean)
let(:user3) {
User.new(user_id: 333, name: ‘Tom’).save(validate: false)
}

8. after
let(:users){[
User.new(user_id: 111, name: ‘Taro').
tap{|a| a.save(validate: false)},
!
User.new(user_id: 222, name: ‘Jiro').
tap{|a| a.save(validate: false)},
]}

9. case 3

10. example
!
!
!
!
1
2
3
4
aa
bb
aa
aa
1
2
aa
bb

11. before
!
def method_1(data)
data.each_with_index do | datum, i|
next if i == 0
datum.destroy if datum.same_value?(self)
end
end
1
aa
1 aa
end
2
bb
2 bb
!
!
!
data.first.method_1(data)
3
4
aa
aa

12. after
!
def method_1(data)
data.each do | datum |
datum.destroy if datum.same_value?(self)
end
end
!
!
!
!
data.shift.method_1(data)
1
2
3
4
aa
bb
aa
aa
1
2
aa
bb

13. So …,

14. How many days left?
2.14

15. Let s horesase"
coding

16. End ♥