<pre class="shiki github-dark shaku"><code>const MAX_CACHE_SIZE = 5;const MAX_CACHE_TTL = 1000// Simple hashing for this question - has some limitationsfunction getCacheKey(path, config) { return Object.entries(config).sort().reduce((acc, curr) =&gt; { return acc = acc + curr.join(''); }, path)}/** * @param {(path: string, config: any) =&gt; Promise&lt;any&gt;} getAPI * @returns {(path: string, config: any) =&gt; Promise&lt;any&gt; &amp; {clearCache: () =&gt; void}} */function createGetAPIWithMerging(getAPI) { const cache = new Map(); function getAPIWithMerging(path, config) { const cacheKey = getCacheKey(path, config); if(cache.has(cacheKey)) { const {result, expiresAt} = cache.get(cacheKey); if(Date.now() &lt; expiresAt) { return result; } } if(cache.size &gt; MAX_CACHE_SIZE) { cache.delete(cache.keys().next().value) } const result = getAPI(path, config); cache.set(cacheKey, { result, expiresAt: Date.now() + MAX_CACHE_TTL }); return result; } getAPIWithMerging.clearCache = cache.clear return getAPIWithMerging;}</code></pre>

Simple cache key Map solution (works with new tests)

> ⚠️ This questions is updated on Oct 22, 2022 which has breaking changes on test specs.Thanks to @Qzlt4LK. Suppose we have a utility function getAPI(…