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<?php declare(strict_types=1); namespace Psl\Iter; use Psl\PseudoRandom; use Psl\Vec; /** * Retrieve a random value from a non-empty iterable. * * @template T * * @param iterable<T> $iterable * * @throws Exception\InvalidArgumentException If $iterable is empty. * * @return T */ function random(iterable $iterable) { // We convert the iterable to an array before checking if it is empty, // this helps us avoids an issue when the iterable is a generator where // would exhaust it when calling `count` $values = Vec\values($iterable); if ([] === $values) { throw new Exception\InvalidArgumentException('Expected a non-empty iterable.'); } $size = namespace\count($values); if (1 === $size) { /** @var T */ return $values[0]; } /** @psalm-suppress MissingThrowsDocblock */ return $values[PseudoRandom\int(0, $size - 1)]; }