});
display('6. Sorted by the 1st character with a comparison function', $sortedByTheFirstCharacter);
// 7. Sort list of strings lexicographically
$sortedLexicographically = sorted(['bc', 'a', 'abc'], false, null, 'strcmp');
display('7. Sorted lexicographically', $sortedLexicographically);
// 8. Sort multidimensional array (sort list of users by their names)
$users = [array('name' => 'Robert', 'age' => 20), array('name' => 'Alex', 'age' => 30), array('name' => 'Jack', 'age' => 25)];
$sortedByName = sorted($users, itemGetter('name'));
display('8.1. Users sorted by name', $sortedByName);
$sortedByNameDesc = sorted($users, true, itemGetter('name'));
display('8.2. Users sorted by name in descending order', $sortedByNameDesc);
// 9. Sort list of objects by property value (sort list of users by their name)
$users = [new User('Robert', 20), new User('Alex', 30), new User('Jack', 25)];
$sortedByName = sorted($users, propertyGetter('name'));
display('9.1. Users presented as list of objects sorted by name', $sortedByName);
$sortedByNameDesc = sorted($users, true, propertyGetter('name'));
display('9.2. Users presented as list of objects sorted by name in descending order', $sortedByNameDesc);
// 10. Sort list of objects by method result (sort list of users by their age)
$sortedByAge = sorted($users, methodCaller('getAge'));
display('10.1. Users presented as list of objects sorted by age', $sortedByAge);
$sortedByAgeDesc = sorted($users, true, methodCaller('getAge'));
display('10.2. Users presented as list of objects sorted by age in descending order', $sortedByAgeDesc);
class User
{
public $name;
public $age;
public function __construct($name, $age)
{
$this->name = $name;
$this->age = $age;
}
public function testPropertyGetter()
{
$users = [new User('John', 18), new User('Jack', 20), new User('Sarah', 19)];
$this->assertEquals(['John', 'Jack', 'Sarah'], map(propertyGetter('name'), $users));
$this->assertEquals([18, 20, 19], map(propertyGetter('age'), $users));
$this->assertEquals([array('name' => 'John', 'age' => 18), array('name' => 'Jack', 'age' => 20), array('name' => 'Sarah', 'age' => 19)], map(propertyGetter('name', 'age'), $users));
}
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) {
echo sprintf("%s! = %s\n", $n, $memoizedFactorial($n));
}
echo sprintf(" %s. %s\n", $id, $user->name);
}
// 8. Create a map (name => age) from users data
$usersAgeByName = indexed($users, propertyGetter('name'), true, propertyGetter('age'));
echo "Users age:\n";
foreach ($usersAgeByName as $name => $age) {
echo sprintf(" %s is %s y.o.\n", $name, $age);
}
// 9. Get users with unique age (unique values in multidimensional array)
$usersWithUniqueAge = array_values(indexed($users, propertyGetter('age')));
echo "Users with unique age:\n";
foreach ($usersWithUniqueAge as $user) {
echo sprintf(" %s is %s y.o.\n", $user->name, $user->age);
}
// 10. Group users by age range
$usersByAgeRange = keySorted(indexed($users, function ($user) {
return floor($user->age / 10) * 10;
}, false));
echo "Users by age range:\n";
foreach ($usersByAgeRange as $age => $usersGroup) {
echo sprintf(" %s-%s: %s\n", $age, $age + 9, implode(', ', map(propertyGetter('name'), $usersGroup)));
}
// 11. Get all numbers less than 20 which are divisible by 3
$numbers = take(range(3, 20), 20, 3);
echo sprintf("Numbers less than 20 which are divisible by 3: %s\n", implode(', ', $numbers));
// 12. Re-order pets rating
$petsRating = reorder(['dog', 'hamster', 'cat'], 2, 1);
echo "New pets rating:\n";
foreach ($petsRating as $pet) {
echo sprintf(" %s\n", $pet);
}
