Level 75
$collection = collect([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$result = $collection->groupBy(fn($item) => $item % 2)->reverse()->flatten();
Jan 28, 2021
5
Level 13
Cleaner way to move filtered items in collection
I want to move filtered items but i'm not comfortable with my codes:
$collection = collect([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
$evenNumbers = $collection->filter(fn($item) => $item % 2 == 0);
$oddNumbers = $collection->filter(fn($item) => $item % 2 != 0);
$arrangedItems = $evenNumbers->merge($oddNumbers);
dd($arrangedItems);
result:
[
2,
4,
6,
8,
10,
1,
3,
5,
7,
9
]
I want to move even numbers to the top of list and vice versa for odd numbers, I did that but i think we can do better with colletion right ? any one has better idea ?
Level 61
@untymage what @michaloravec wrote is not correct. If you have an array that is not ordered it will break.
$collection = collect([2, 4, 6, 8, 10, 1, 3, 5, 7, 9]);
$result = $collection->groupBy(fn ($item) => $item % 2 )->reverse()->flatten(); // 1,3,5,7,9,2,4,6,8,10
You need sort function:
$result = collect([2, 4, 6, 8, 10, 1, 3, 5, 7, 9])->sort(function ($a, $b) {
if ($a % 2 === 0 && $b % 2 ===0) return $a > $b;
if ($a % 2 !== 0 && $b % 2 !==0) return $a > $b;
return $a < $b;
});
This way you will always have correct order.
Or you would have to add sort() to his solution.
$result = $collection->sort()->groupBy(fn($item) => $item % 2)->reverse()->flatten();
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