PHP code example of dryist / functions

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

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

    

dryist / functions example snippets

use function Dryist\always;

$fn = always(true);

assert($fn() === true);

use function Dryist\compose;

$fn = compose('ucwords', 'strtolower');

assert($fn('SALLY SMITH') === 'Sally Smith');

use function Dryist\identity;

assert(identity('foo') === 'foo');

use function Dryist\invert;

$notNull = invert('is_null');

assert($notNull(42) === true);
assert($notNull(null) === true);

use function Dryist\count;

$items = [1, 2, 3];

assert(count($items) === 3);

use function Dryist\combine;
use function Dryist\resolve;

$keys = ['city', 'country'];
$values = ['London', 'England'];
$map = combine($keys, $values);

assert(resolve($map) === ['city' => 'London', 'country' => 'England']);

use function Dryist\filter;
use function Dryist\resolve;
use function Dryist\values;

$positive = function (int $value): bool {
    return $value > 0;
};

$list = [-100, 0, 100];
$list = filter($list, $positive);

// Drop keys
$list = values($list);

assert(resolve($list) === [100]);

use function Dryist\filterKey;
use function Dryist\resolve;
use function Dryist\values;

$even = function (int $value): bool {
    return $value % 2 === 0;
};

$map = [13 => 'a', 16 => 'b', 22 => 'c'];
$map = filterKey($map, $even);

// Drop keys
$list = values($map);

assert(resolve($list) === ['b', 'c']);

use function Dryist\keys;
use function Dryist\resolve;

$map = ['name' => 'Jane', 'friends' => 42];
$keys = keys($map);

assert(resolve($keys) === ['name', 'friends']);

use function Dryist\map;
use function Dryist\resolve;

$list = ['foo', 'bar', 'baz'];
$list = map($list, 'strtoupper');

assert(resolve($list) === ['FOO', 'BAR', 'BAZ']);

use function Dryist\mapBoth;
use function Dryist\resolve;

$list = ['foo', 'bar', 'baz'];
$list = mapBoth($list, function ($key, $value) {
    if ($key % 2 === 0) {
        return strtoupper($value);
    }
    return $value;
});

assert(resolve($list) === ['FOO', 'bar', 'BAZ']);

use function Dryist\mapKey;
use function Dryist\resolve;

$map = ['NAME' => 'Bob', 'GAME' => 'football'];
$map = mapKey($map, 'strtolower');

assert(resolve($map) === ['name' => 'Bob', 'game' => 'football'])

use function Dryist\resolve;
use function Dryist\take;

$map = ['name' => 'Cassie', 'friends' => 152, 'age' => 39];
$map = take($map, ['name']);

assert(resolve($map) === ['name' => 'Cassie']);

use function Dryist\values;
use function Dryist\resolve;

$map = ['a' => 1, 'b' => 2, 'c' => 3];
$list = values($map);

assert(resolve($list) === [1, 2, 3]);

use function Dryist\make;
use function Dryist\map;
use function Dryist\resolve;

$list = [[1, 2, 3], [4, 5], [6]];
$list = map($list, make(ArrayIterator::class));

assert(resolve($list)[0] instanceof ArrayIterator);

use function Dryist\stringify;

assert(stringify(null) === null);
assert(stringify(42) === "42");