Count LRU Cache Misses

Problems
1

https://algo.monster/problems/count_lru_cache_misses

2 
function lruCacheMisses(num, pages, maxCacheSize) {
    const cache = new Set();
    let missCount = 0;
    
    for (const page of pages) {
        if (cache.has(page)) {
            cache.delete(page);
        } else {
            missCount++;
        }
        cache.add(page);
        if (cache.size > maxCacheSize) {
            const lruPage = cache.values().next().value;
            cache.delete(lruPage);
        }
    }
    return missCount;
}