<pre class="shiki github-dark shaku"><code>/** * @param {Function} func * @param {(args:[]) =&gt; string } [resolver] - cache key generator */function memo(func, resolver) { const cache = new Map() return function(...args){ const key = resolver? resolver(...args) : Array.from(args).join('_') if(cache.has(key)){ return cache.get(key) } const res = func.apply(this,args) cache.set(key,res) return res }}</code></pre>