miguelsaddress / phpunctional

Collection of functional experiments on PHP

phpunctional

Collection of functional experiments on PHP

This repository is meant to hold different experiments on functional programming using PHP.

##DataStore

Contains a Value Store (like an array or vector in some languages) and a Key Value Store (a hash or a map on other languages) For examples of use, you can check the tests.

    $vs = new Mamoreno\DataStore\ValueStore();
    $vs = $vs->set(1)->set(2)->set(3)->set(4)->set(5)->set(12);
    $evenDouble = $vs->filter(function($e){ return $e % 2 === 0;}) //[2,4,12]
                     ->map(function($e){ return $e * 2; }) //[4,8,24]
                     ->set(8) //[4,8,24,8]
                     ->uniqueValues(); //[4,8,24]
                     
    print_r($evenDouble);
    Array (
        [0] => 4
        [1] => 8
        [2] => 24
    )
     

##Optionals

Behaves like the Option type of Scala... or tries to :)

Some examples:

$a = option(null);
$b = option(4);


$chainedFlatMapOfNone = $a->flatMap(function($e) { return Some($e + 10);}); //none
$chainedFlatMapOfSome = $b->flatMap(function($e) { return Some($e + 10);}); //Some(14)

$nestedFlatMapsOfNone = $a->flatMap(function($e) { return Some($e + 105454545);})
                          ->flatMap(function($e) { return Some($e + 10 - 3);}); //none


$nestedFlatMapsOfSomeToSomeWithMap = $b->flatMap(function($e) { return Some($e + 105454545);})
                                       ->flatMap(function($e) { return Some($e + 10 - 3);})
                                       ->map(function($e) { return $e;}); //Some(105454556)

$nestedFlatMapsOfSomeToNone = $b->flatMap(function($e) { return Some($e + 105454545);})
                                ->flatMap(function($e) { return Some($e + 10 - 3);})
                                ->map(function($e) { return option(null);}); //None

Outputs

The value of the [Mamoreno\Optionals\None] is [Mamoreno\Optionals\None]
The value of the [Mamoreno\Optionals\Some] is [4]
The value of the [Mamoreno\Optionals\None] is [Mamoreno\Optionals\None]
The value of the [Mamoreno\Optionals\Some] is [14]
The value of the [Mamoreno\Optionals\None] is [Mamoreno\Optionals\None]
The value of the [Mamoreno\Optionals\Some] is [105454556]
The value of the [Mamoreno\Optionals\None] is [Mamoreno\Optionals\None]