PHP code example of zicht / itertools

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

zicht / itertools example snippets

$words = ['Useful', 'Goonies', 'oven', 'Bland', 'notorious'];
$numbers = [1, 3, 2, 5, 4];
$vehicles = [
    [
        'id' => 1,
        'type' => 'car', 
        'wheels' => 4, 
        'colors' => ['red', 'green', 'blue'], 
        'is_cool' => false, 
        'price' => 20000,
    ],
    [
        'id' => 2,
        'type' => 'bike', 
        'wheels' => 2, 
        'colors' => ['red', 'green', 'blue'], 
        'is_cool' => false, 
        'price' => 600,
    ],
    [
        'id' => 5,
        'type' => 'unicicle', 
        'wheels' => 1, 
        'colors' => ['red'], 
        'is_cool' => true, 
        'price' => 150,
    ],
    [
        'id' => 9,
        'type' => 'car', 
        'wheels' => 8, 
        'colors' => ['blue'], 
        'is_cool' => true, 
        'price' => 100000,
    ],
];

use Zicht\Itertools\util\Filters;
use function Zicht\Itertools\iterable;

$vehicles = iterable($vehicles)
    ->filter(Filters::equals('car', 'type')) // {[vehicle...], [vehicle...]}
    ->map('colors') // {0: ['red', 'green', 'blue'], 1: ['blue']}
    ->collapse() // {0: 'red', 1: 'green', 2: 'blue', 3: 'blue'}
    ->unique() // {0: 'red', 1: 'green', 2: 'blue'}
    ->sorted(); // {2: 'blue', 1: 'green', 0: 'red'}

    use function Zicht\Itertools\iterable;

    $result = iterable($words)->map(null);
    var_dump($result);
    // {0: 'Useful', 1: 'Goonies', 2: 'oven', 3: 'Bland', 4: 'notorious'}
    

    use function Zicht\Itertools\iterable;

    $getDouble = fn($value, $key) => 2 * $value;
    $result = iterable($numbers)->map($getDouble);
    var_dump($result);
    // {0: 2, 1: 6, 2: 4, 3: 10, 4: 8}
    

    use function Zicht\Itertools\iterable;

    $result = iterable($vehicles)->map('type');
    var_dump($result);
    // {0: 'car', 1: 'bike', 2: 'unicicle', 3: 'car'}
    

    use function Zicht\Itertools\iterable;

    $result = iterable($vehicles)->map('colors.2');
    var_dump($result);
    // {0: 'blue', 1: 'blue', 2: null, 3: null}
    

use function Zicht\Itertools\iterable;

$result = iterable($vehicles)->filter('is_cool')->mapBy('id')->map('type');
var_dump($result);
// {5: 'unicicle', 9: 'car'}

use function Zicht\Itertools\iterable;

$getTitle = fn($value, $key) => sprintf('%s with %s wheels', $value['type'], $value['wheels']);
$titles = iterable($vehicles)->map($getTitle);
var_dump($titles);
// {0: 'car with 4 wheels', ..., 3: 'car with 8 wheels'}

use function Zicht\Itertools\iterable;

$types = iterable($vehicles)->mapBy('id')->map('type');
var_dump($types);
// {1: 'car', 2: 'bike', 5: 'unicicle', 9: 'car'}

use Zicht\Itertools\util\Mappings;
use function Zicht\Itertools\iterable;

$lengths = iterable($words)->map(Mappings::length());
var_dump($lengths);
// {0: 6, 1: 3, 2: 4, 3: 5, 4: 9}

use function Zicht\Itertools\iterable;

$isExpensive = fn($value, $key) => $value['price'] >= 10000;
$expensiveTypes = iterable($vehicles)->filter($isExpensive)->map('type');
var_dump($expensiveTypes);
// {1: 'car', 9: 'car'}

use function Zicht\Itertools\iterable;

$coolVehicleTypes = iterable($vehicles)->filter('is_cool')->map('type');
var_dump($coolVehicleTypes);
// {5: 'unicicle', 9: 'car'}

use Zicht\Itertools\util\Filters;
use function Zicht\Itertools\iterable;

$movieWords = iterable($words)->filter(Filters::in(['Shining', 'My little pony', 'Goonies']));
var_dump($movieWords);
// {1: 'Goonies'}

use function Zicht\Itertools\iterable;

$ordered = iterable($numbers)->sorted();
var_dump($ordered);
// {0: 1, 2: 2, 1: 3, 4: 4, 3: 5}

use function Zicht\Itertools\iterable;

$getLower = fn($value, $key) => strtolower($value);
$ordered = iterable($words)->sorted($getLower);
var_dump($ordered);
// {3: 'Bland', 1: 'Goonies', 2: 'oven', 0: 'Useful', 4: 'notorious'};

use Zicht\Itertools\util\Mappings;
use function Zicht\Itertools\iterable;

$randomized = iterable($words)->sorted(Mappings::random());
var_dump($randomized);
// {... randomly ordere words ...}

use function Zicht\Itertools\iterable;

$vehiclesByType = iterable($vehicles)->groupBy('type');
var_dump($vehiclesByType);
// {'bike': {1: [...]}, 'car': {0: [...], 3: [...]} 'unicicle': {2: [...]}}

use function Zicht\Itertools\iterable;

$sum = iterable($numbers)->reduce();
var_dump($sum);
// 15

public static function add($a, $b): \Closure
{
    return $a + $b;
}

$sum = Reductions::add(Reductions::add(Reductions::add(Reductions::add((1, 3), 2), 5), 4));
var_dump($sum);
// 15

use Zicht\Itertools\util\Reductions;
use function Zicht\Itertools\iterable;

$scentence = iterable($words)->reduce(Reductions::join(' - '));
var_dump($scentence);
// 'Useful - Goonies - oven - Bland - notorious'

use function Zicht\Itertools\iterable;

$flat = iterable([['one', 'two'], ['three']])->collapse();
var_dump($flat);
// {0: 'one', 1: 'two', 0: 'three'}