How to use Laravel Transform

You will get an example in Laravel documentation that how to use transform() in Laravel. You might see example code like that-

$collection = collect([1, 2, 3, 4, 5]);

$collection->transform(function ($item, $key) {
    return $item * 2;
});

$collection->all();

// [2, 4, 6, 8, 10]

Easy enough, right?

However, if it is not clear to you, and you need a more in-depth real-life example, then let's see another example.

Imagine that, I have a users collection that contains

• id
• name
• email
• created_at
• updated_at

Now, during returning this data, you want to inject one or more record with each. For example, I want to inject a location column with each iteration.

The code will be like that-

public function index()
{
        $users = User::latest()->get();

        /*
        // sample output
        {
            "id": 1,
            "name": "John Doe",
            "email": "[email protected]",
            "created_at": "2018-12-13 19:34:44"
            "updated_at": "2018-12-13 19:34:44"
        },
        {...}
        */

        $users->transform(function($transform){
            $transform->location = "Kuala Lumpur";

            return $transform;
        });

        /*
            // transformed output
            {
                "id": 1,
                "name": "John Doe",
                "email": "[email protected]",
                "location": "Kuala Lumpur",
                "created_at": "2018-12-13 19:34:44"
                "updated_at": "2018-12-13 19:34:44"
            },
            {...}
        */
}

Hope, it makes a clearer image to you.

Thank you.