public function testFlipped()
{
$f = function ($a, $b, $c) {
return $a . $b . $c;
};
$flippedF = flipped($f);
$this->assertEquals('cba', $flippedF('a', 'b', 'c'));
$flippedF = call_user_func(flipped, $f);
$this->assertEquals('cba', $flippedF('a', 'b', 'c'));
$this->assertEquals('\\nspl\\f\\flipped', flipped);
}
use function nspl\f\rpartial;
use function nspl\f\flipped;
use function nspl\f\compose;
use function nspl\f\memoized;
use const nspl\op\object;
use const nspl\op\gt;
use const nspl\op\mul;
use function nspl\op\propertyGetter;
use const nspl\a\value;
use function nspl\a\map;
use function nspl\a\reduce;
use function nspl\a\filter;
$users = map(object, [array('id' => 1, 'name' => 'John', 'age' => 15), array('id' => 2, 'name' => 'Jack', 'age' => 35), array('id' => 3, 'name' => 'Sarah', 'age' => 25), array('id' => 4, 'name' => 'Norah', 'age' => 20), array('id' => 5, 'name' => 'Michael', 'age' => 30), array('id' => 6, 'name' => 'Bob', 'age' => 30)]);
// 1. Get user name from which can be stored as username, user_name or name in data array
$data = array('id' => 1337, 'name' => 'John', 'gender' => 'male');
$name = reduce(flipped(partial(value, $data)), ['username', 'user_name', 'name'], '');
echo sprintf("User name is %s\n", $name);
// 2. Get users older than 25
$isOlderThan25 = compose(rpartial(gt, 25), propertyGetter('age'));
$olderThan25 = filter($isOlderThan25, $users);
echo "These users are older than 25:\n";
foreach ($olderThan25 as $user) {
echo sprintf(" %s - %s y.o.\n", $user->name, $user->age);
}
// 3. Memoizing heavy calculations
$factorial = function ($n) {
echo "Calculating {$n}!\n";
return reduce(mul, range(1, $n), 1);
};
$memoizedFactorial = memoized($factorial);
foreach ([3, 3, 5, 5, 5] as $n) {
use function nspl\op\itemGetter;
use function nspl\op\propertyGetter;
use function nspl\f\map;
use function nspl\f\reduce;
use function nspl\f\flipped;
use function nspl\f\partial;
// 1. Check all statuses are "ready"
$statuses = ['ready', 'ready', 'not-ready'];
$ready = all($statuses, partial(eq, 'ready'));
echo $ready ? "Everybody is ready\n" : "Someone is not ready\n";
// 2. Check at least someone is "ready"
$someoneIsReady = any($statuses, partial(eq, 'ready'));
echo $someoneIsReady ? "Someone is ready\n" : "Everybody is not ready\n";
// 3. Get user name from which can be stored as username, user_name or name in data array
$data = array('id' => 1337, 'name' => 'John', 'gender' => 'male');
$name = reduce(flipped(partial(getByKey, $data)), ['username', 'user_name', 'name'], '');
echo sprintf("User name is %s\n", $name);
// 4. Sort list of user objects by their name
$users = map(object, [array('id' => 1, 'name' => 'John', 'age' => 15), array('id' => 2, 'name' => 'Jack', 'age' => 35), array('id' => 3, 'name' => 'Sarah', 'age' => 25), array('id' => 4, 'name' => 'Norah', 'age' => 20), array('id' => 5, 'name' => 'Michael', 'age' => 30), array('id' => 6, 'name' => 'Bob', 'age' => 30)]);
$usersSortedByName = sorted($users, false, propertyGetter('name'));
echo "Users sorted by name:\n";
foreach ($usersSortedByName as $user) {
echo sprintf(" %s\n", $user->name);
}
// 5. Index users by ids
$usersIndexedByIds = indexed($users, propertyGetter('id'));
// In case of array it would be indexed($users, 'id')
echo "Users indexed by id:\n";
foreach ($usersIndexedByIds as $id => $user) {
echo sprintf(" %s. %s\n", $id, $user->name);
}