LaravelConf Taiwan 2019 - 忘掉 foreach，從此學會 Collection！ 鄭宇翔 - 跑跑腿科技 技術顧問 寫程式的時候，總免不了需要使用 for、foreach、while 等遞迴技巧來整理資料、調整陣列結構。但每次寫一層又一層的 foreach 時，總覺得可讀性太差，寫到最後連它媽都不認識它？ 這場議程，宇翔就是要教你忘掉 foreach，從此改用 Collection。除了會從基礎介紹什麼是 Collection 外，還會比較 Support\Collection 和Eloquent\Collection 之間的差異，以及 Builder 和 Collection 同名的 method 的細微不同。並以 map、filter、reduce 三大常見手法，說明如何做資料處理、陣列轉型及 Functional Programing 的技巧。當然，官方文件上沒說的隱藏用法及各種踩過的坑也會一併帶到。

1. 忘掉 foreach
從此學會 Collection！
LaravelConf Taiwan 2019

2. 自我介紹

3. 工商時間

4. 即時人力服務
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PAOPAOTUI COMPANY
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5. Hiring
天瀚國際科技
PHP Senior 後端工程師 60K - 100k * 14
hr@universetech.cc

6. Environment Version
PHP 7.3.6
Laravel 5.8.28

7. What is Collection?

8. Create Collection
1. new
2.
3.
4.

9. Create Collection
1. new
2. static method
3.
4.

10. Create Collection
1. new
2. static method
3. helper function
4.

11. Create Collection
1. new
2. static method
3. helper function
4. wrap

12. Methods in Collection

13. Reference https://laravel.com/docs/master/collections#available-methods

14. Impletement
ArrayAccess
Countable
IteratorAggregate
JsonSerializable
Arrayable
Jsonable

15. Fluent API

16. collect()->take(10)->reverse()->toArray()

17. Before

24. IlluminateSupportCollecton
vs
IlluminateDatabaseEloquentCollection

33. When is EloquentCollection

34. $users = AppUser::all();
$orders = $user->orders

35. When is SupportCollection

36. collect();

39. Builder vs Collection

44. IlluminateDatabaseConcerns
BuildsQueries

45. Functional Programming

46. Pointfree

47. Divide and Conquer

48. Pure Function

49. Immutable

50. $begin = Carbon::now();
$end = $begin->addHour();

51. Use FP in Collection

52. map、filter、reduce

57. Frequency of use

63. all()
vs
toArray()

64. average
avg
contains
each
every
filter
first
flatMap
groupBy
keyBy
map
max
min
partition
reject
some
sortBy
sortByDesc
sum
unique
when
countBy

65. Higher order messages

68. Variant
sum()
sum(‘key’)
sum(‘key.id’)
sum(callback)

74. Extend Collection

76. Eloquent’s newCollection();

80. Warning

81. Type strict

84. Problem in PHP array

86. $collection->values()
array_values()

87. Performance

96. Not use Laravel?

97. composer require illuminate/support

98. composer require tightenco/collect
Reference https://github.com/tightenco/collect

99. Thanks for your participation