Join 2 laravel collections - php

Question

I have 2 collections :
$collection1 = [
{ name : "aaa" , score : 10 },
{ name : "bbb" , score : 20 }
];
$collection2 = [
{ name : "aaa" , score : 30 },
{ name : "bbb" , score : 10 }
];
and I want to join them to get the following result :
$collection3 = [
{ name : "aaa" , score : 40 },
{ name : "bbb" , score : 30 }
]
merge() and union() didn't do the job for me .

Answer 1

Combine the collections, group by the name and sum the score. This can be done like so with collections in Laravel. Note that group by returns a collection of the grouped data.
$collection1->concat($collection2);
$collection1->groupBy('name')->map(function ($scores) {
$score = $scores->first();
$score['score'] = $scores->sum('score');
return $score;
});

Answer 2

it can be achieve by laravel collection map() and where() function
$collection1 = collect([
[
"name" => "aaa",
"score" => 10
],
[
"name" => "bbb",
"score" => 20
]
]);
$collection2 = collect([
[
"name" => "aaa",
"score" => 30
],
[
"name" => "bbb",
"score" => 10
]
]);
$collection3 = $collection1->map(function ($item) use ($collection2) {
$found = $collection2->where('name', $item['name']);
if ($found) {
$item['score'] = $item['score'] + $found->first()['score'];
}
return $item;
});
dd($collection3);
This is the result https://phpsandbox.io/n/soft-flower-ap1e-vo2xy

Answer 3

$collection = collect();$collection->merge(['col1' => $col1, 'col2' => $col2 ]);
OR $states = [ 'Delhi', 'Tamil Nadu', 'Uttar Pradesh'];
foreach ($states as $state)
{ $data = DB::table('user')->select('user.*') ->where("user.city", $state)->where('user.status', 1)->get(); if (!empty($data[0])) $stateUser = $stateUser->merge([$state => $data]);}