/**
* Returns sequence items that satisfy the predicate
*
* @param callable $predicate
* @param array|\Traversable $sequence
* @return array
*/
function filter(callable $predicate, $sequence)
{
args\expects(args\traversable, $sequence);
$sequence = ds\traversableToArray($sequence);
$filtered = array_filter($sequence, $predicate);
return ds\isList($sequence) ? array_values($filtered) : $filtered;
}
/**
* Returns a random element from a non-empty sequence
*
* @param array|\Traversable $sequence
* @return mixed
*/
function choice($sequence)
{
if (!$sequence) {
throw new \InvalidArgumentException('Sequence is empty');
}
args\expects(args\traversable, $sequence);
$sequence = ds\traversableToArray($sequence);
return $sequence[array_rand($sequence)];
}
public function testTraversableToArray()
{
$this->assertEquals([1, 2, 3], traversableToArray([1, 2, 3]));
$this->assertEquals([1, 2, 3], traversableToArray(new ArrayObject(1, 2, 3)));
$this->assertEquals([1, 2, 3], traversableToArray(new \ArrayObject([1, 2, 3])));
$range = function ($min, $max) {
for ($i = $min; $i <= $max; ++$i) {
(yield $i);
}
};
$this->assertEquals([1, 2, 3], traversableToArray($range(1, 3)));
}
/**
* Returns array which contains sequence items sorted by keys
*
* @param array|\Traversable $array
* @param bool $reversed
* @return array
*/
function keySorted($array, $reversed = false)
{
args\expects(args\traversable, $array);
args\expects(args\bool, $reversed);
$array = ds\traversableToArray($array);
if ($reversed) {
krsort($array);
} else {
ksort($array);
}
return $array;
}