Cache.has

Returns true if the key exists and has not yet expired.

Full example:

fun getPostsForUser($userId) {

    $key = 'posts:' ~ $userId

    if Cache.has($key) {
        return Cache.get($key)
    }

    // The time-consuming operation to be cached
    $posts = getPostsFromDb($userId)

    Cache.set($key, $posts, '8 hours')

    return $posts
}