5 Best Laravel Collections Methods

These methods allow us to modify or retrieve data without re-query to the database. There is a lot of collection methods available and here are 5 best Laravel collections methods.

Merge of two different collections

The below method used to merge two collections and it will produce the new merged collection.

merge()

Response Type: Collection

See full article: How to merge two different Laravel collections.

Collection of multiple arrays into single array collection

The below Laravel collections method used to collapse multiple arrays collection into a single array collection.

collapse()

Response Type: Collection

For example:

$fruits = collect([[‘apple’], [‘banana’], [‘grapse’]]);
dd($fruits);

The output will be:

Now use the collapse method to collapse all arrays into single array.

$allFruits = $fruits->collapse();
dump($allFruits->all());

The output will be:

Get the average value from the collection

We can use the following method to calculate the average value, like this:

avg()

Response Type: Integer

public function employees() {
        $emps = collect([
            [
                'id'=> 'ADF345FG',
                'salary'=> 13000
            ],
            [
                'id'=> 'ADF346FG',
                'salary'=> 9000
            ],
            [
                'id'=> 'ADF347FG',
                'salary'=> 20000
            ]
        ]); 
        dump($emps);
        dump('Average salary is = '.$emps->avg('salary'));
    }

The output will be:

Average Salary is = 14000

How to check value existence in the Laravel collection?

The following method used to check the Laravel collection for value existence.

Contains()

Response Type: Boolean

Single dimensional array collection

$collection = collect([‘fruit’=>’apple’, ‘amount’=>340]);
dd($collection->contains(‘fruit’));

The output will be:

False

Actually contains method assume the single parameter as a value not the key of array. like this,

$collection = collect([‘fruit’=>’apple’, ‘amount’=>340]);
dd($sdArray->contains(‘apple’));

The output will be:

True

Multidimensional array collection

$collection = collect([
            ['fruit'=>'apple','amount'=>234],
            ['fruit'=>'banana','amount'=>243],
            ['fruit'=>'grapse','amount'=>499]
        ]);
dump($collection->contains('grapse'));

The output will be:

False

Search in pairs (Keys and Values)

$collection = collect([‘fruit’=>’apple’, ‘amount’=>340]);
                 or
$collection = collect([
            ['fruit'=>'apple','amount'=>234],
            ['fruit'=>'banana','amount'=>243],
            ['fruit'=>'grapse','amount'=>499]
        ]);
dump($collection->contains(‘fruit’, ‘apple’));

The output will be:

True

How to reverse Laravel collection?

Like array_reverse() in php reverse() method used to reverse Laravel collection.

Response Type: Collection

$fruits = collect([‘apple’, ‘banana’, ‘grapse’, ‘orange’, ‘papaya’]);
dump($fruits->reverse());

The output will be:

Collection {#210 ▼
  #items: array:5 [▼
    4 => "papaya"
    3 => "orange"
    2 => "grapse"
    1 => "banana"
    0 => "apple"
  ]
}

This method reverses the pairs of array-like key and value both.

More Laravel collection methods https://laravel.com/docs/5.8/eloquent-collections#available-methods

That’s it, I will definitely back with more Laravel collections methods.

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