Widmogrod\FantasyLand\Traversable::traverse PHP Method

    public function traverse(callable $transformation);

/**
 * traverse :: Applicative f => (a -> f b) -> t a -> f (t b)
 *
 * Map each element of a structure to an action, evaluate these actions from left to right, and collect the results
 *
 * @param callable $transformation (a -> f b)
 * @param Traversable $t           t a
 *
 * @return Applicative     f (t b)
 */
function traverse(callable $transformation, Traversable $t = null)
{
    return call_user_func_array(curryN(2, function (callable $transformation, Traversable $t) {
        return $t->traverse($transformation);
    }), func_get_args());
}