/** * @test */ public function map() { $inc = function ($x) { return $x + 1; }; $plus2 = function ($x) { return $x + 2; }; $y = F\map($inc); $this->assertEquals($y([1, 2, 3, 4, 5, 6, 7, 8, 9]), [2, 3, 4, 5, 6, 7, 8, 9, 10]); $this->assertEquals(F\map($plus2, [1, 2, 3, 4, 5, 6, 7, 8, 9]), [3, 4, 5, 6, 7, 8, 9, 10, 11]); }
<?php use Sergiors\Functional as F; require_once __DIR__ . '/../vendor/autoload.php'; $join = F\pipe(F\flatten, F\partial('implode', ', ')); $mapCountry = F\map(function ($x) { return $x['country']; }); $countries = F\pipe($mapCountry, $join)->strtoupper(); // or `->pipe('strtoupper')` $mapCity = F\map(function ($x) { return $x['cities']; }); $cities = F\pipe($mapCity)->pipe($join); $xs = [['country' => 'Brazil', 'cities' => ['Florianópolis', 'Rio de Janeiro', 'Porto Alegre']], ['country' => 'USA', 'cities' => ['Baltimore', 'San Diego']], ['country' => 'China', 'cities' => ['Macau', 'Hong Kong']]]; assert('BRAZIL, USA, CHINA' === $countries($xs)); assert('Florianópolis, Rio de Janeiro, Porto Alegre, Baltimore, San Diego, Macau, Hong Kong' === $cities($xs));