How to extract a max() value from a collection at a given nested key ?

Yes, you can achieve this using Laravel's collection methods. You can use the max method to find the maximum value and then use the first method to retrieve the corresponding item. Here's how you can do it:

$collection = collect([
    ['foo' => 10, 'bar' => ['value' => 50, 'code' => 1]],
    ['foo' => 20, 'bar' => ['value' => 40, 'code' => 2]],
]);

$maxValue = $collection->max('bar.value');

$maxItem = $collection->first(function ($item) use ($maxValue) {
    return $item['bar']['value'] === $maxValue;
});

$barContent = $maxItem['bar'];

print_r($barContent);

This will output:

Array
(
    [value] => 50
    [code] => 1
)

Explanation:

1. We first find the maximum value in the nested bar.value using the max method.
2. We then use the first method to find the first item in the collection where bar.value matches the maximum value.
3. Finally, we extract the bar content from the item with the maximum value.

This approach ensures that you get the bar content for the item with the highest bar.value in a clean and efficient manner.