This talk is all about Laravel collections. An overview of the power that it provides and how it improves the code readability. By one side the performance of the application is affected, but it is often not the case. The win of using collections is more than only performance, it improves maintenance, and help teams to build a better app. A few resources are mentioned as well. The book written by Adam Wathan, the book written by Jeffrey Madsen and the collection package source code.

1. COLLECTIONS
Laravel

4. MARABESI

6. ARRAYS?

7. An array is a data structure that contains a
group of elements.
"
https://techterms.com/definition/array

8. <?php
$array = array(
'foo' => 'bar',
'bar' => 'foo',
);
// as of PHP 5.4
$array = [
'foo' => 'bar',
'bar' => 'foo',
];
?>
http://php.net/manual/en/language.types.array.php

9. The IlluminateSupportCollection class
provides a fluent, convenient wrapper for
working with arrays of data.
"
https://laravel.com/docs/5.0/collections

10. In computer science, a collection or
container is a grouping of some variable
number of data items (possibly zero) that
have some shared significance to the
problem being solved and need to be
operated upon together in some controlled
fashion.
"
https://en.wikipedia.org/wiki/Collection_(abstract_data_type)

11. $collection = collect([ 1, 2, 3 ]);
$collection = collect([ 'foo', 'bar' ]);
https://laravel.com/docs/collections
$collection = collect([ new User() ]);

12. $collection = collect([ 1, 2, 3 ]);
$collection = collect([ 'foo', 'bar' ]);
$collection = collect([ new User() ]);
https://laravel.com/docs/collections

13. $collection = collect([ 1, 2, 3 ]);
$collection = collect([ 'foo', 'bar' ]);
$collection = collect([ new User() ]);
https://laravel.com/docs/collections

14. $collection = collect([ 1, 2, 3 ]);
$collection = collect([ 'foo', 'bar' ]);
$collection = collect([ new User() ]);
https://laravel.com/docs/collections

15. $collection = collect([ 1, 2, 3 ]);
$collection = collect([ 'foo', 'bar' ]);
$collection = collect([ new User() ]);
https://laravel.com/docs/collections

16. use IlluminateSupportCollection;
$collection = new Collection();

17. COLLECTIONS
ARRAYS
X

18. IT SEEMS TO
BE THE
SAME THING...

19. $collection = collect([
'bar', 'foo'
]);
$array = [
'foo' => 'bar',
'bar' => 'foo',
];

20. HOW WOULD
YOU DO A SUM
FUNCTION?

21. <?php
$numbers = [
1,
2,
3
];
$total = 0;
for ($i = 0; $i < count($numbers); $i++) {
$total += $numbers[$i];
}
SUM

22. <?php
$numbers = [
1,
2,
3
];
$collection = collect($numbers);
$collection->sum();
SUM

23. HOW WOULD
YOU DO AN
AVG
FUNCTION?

24. <?php
$numbers = [
1,
2,
3
];
$total = 0;
for ($i = 0; $i < count($numbers); $i++) {
$total += $numbers[$i];
}
$total = $total / count($numbers);
AVG

25. <?php
$numbers = [
1,
2,
3
];
$collection = collect($numbers);
$collection->avg();
AVG

26. HOW WOULD
YOU DO A
SORT
FUNCTION?

27. <?php
$data = [
'c',
'd',
'a',
'b'
];
sort($data);
SORT

28. <?php
$data = [
'c',
'd',
'a',
'b'
];
$collection = collect($data);
$result = $collection->sort();
$values = $result->values()->all();
SORT

29. AVOID
NOTICES

30. <?php
$numbers = [
1,
2,
3
];
$numbers[4];
NOTICE

31. <?php
$numbers = [
1,
2,
3
];
$collection = collect($numbers);
$collection->get(4);
NOTICE
NULL

32. <?php
$numbers = [
1,
2,
3
];
$collection = collect($numbers);
$collection->get(4, 0);
NOTICE
0 (Zero)

33. <?php
$numbers = [
1,
2,
3
];
for ($i = 0; $i < count($numbers); $i++) {
$numbers[$i] = $numbers[$i] * 2;
}
MAP

34. <?php
$numbers = [
1,
2,
3
];
$collection = collect($numbers);
$result = $collection->map(function($item, $key) {
return $item * 2;
});
MAP

35. <?php
$numbers = [
1,
2,
3
];
for ($i = 0; $i < count($numbers); $i++) {
if ($numbers[$i] === 2) {
unset($numbers[$i]);
}
}
FILTER

36. <?php
$numbers = [
1,
2,
3
];
$collection = collect($numbers);
$result = $collection->filter(function($item, $key) {
return $item !== 2;
});
FILTER

42. !!! BONUS !!!

43. <?php
use IlluminateSupportStr;
Collection::macro('toUpper', function () {
return $this->map(function ($value) {
return Str::upper($value);
});
});
$collection = collect(['first', 'second']);
$upper = $collection->toUpper();

44. PERF TIME

45. <?php
$startTime = microtime(true);
for ($i = 0; $i < 10000000; $i++) {
$data = [
'c',
'd',
'a',
'b',
];
sort($data);
}
echo 'Time: ' . number_format(( microtime(true) - $startTime), 4) . ' Seconds';
https://stackoverflow.com/questions/1200214/how-can-i-measure-the-speed-of-code-written-in-php

46. STEP PHP TIME
First run 7.1.7 2.4553
Second run 7.1.7 2.6595
Third run 7.1.7 2.4450

47. STEP PHP TIME
First run 7.2.0beta1 2.0294
Second run 7.2.0beta1 2.0281
Third run 7.2.0beta1 2.7551

48. <?php
require 'vendor/autoload.php';
use IlluminateSupportCollection;
$startTime = microtime(true);
for ($i = 0; $i < 10000000; $i++) {
$data = [
'c',
'd',
'a',
'b'
];
$collection = collect($data);
$result = $collection->sort();
$result->values()->all();
}
echo 'Time: ' . number_format(( microtime(true) - $startTime), 4) . ' Seconds';
https://stackoverflow.com/questions/1200214/how-can-i-measure-the-speed-of-code-written-in-php

49. STEP PHP TIME
First run 7.1.7 11.7716
Second run 7.1.7 12.4548
Third run 7.1.7 12.2648

50. STEP PHP TIME
First run 7.2.0beta1 11.0426
Second run 7.2.0beta1 10.7730
Third run 7.2.0beta1 9.2139

51. WHY SHOULD I
USE
COLLECTIONS?

52. 1. Eloquent models,
return collections by
default

53. 2. Keep your code
readable
Avoid nested loops or unnecessary logic

54. 3. Good
Documentation

55. LEARNING
MORE

56. https://adamwathan.me/refactoring-to-collections

57. https://leanpub.com/laravelcollectionsunraveled

58. https://github.com/illuminate/support/blob/master/Collection.php

60. MARABESI