@@ -0,0 +1,33 @@
+function sum(num) {
+  let sum = 0;
+  for (let i = 1; i <= num; i++) {
+    sum += i;
+  }
+  return sum;
+}
+
+function memoizeSum(func) {
+  const cache = {};
+  return function (...args) {
+    const arg = args[0];
+    if (cache[arg]) {
+      console.log("PRESENT IN CACHE");
+      return cache[arg];
+    } else {
+      console.log("CALCULATING...");
+      const result = func(arg);
+      cache[arg] = result;
+      return result;
+    }
+  };
+}
+
+const memoizedSum = memoizeSum(sum);
+
+console.time();
+console.log(memoizedSum(5));
+console.timeEnd();
+
+console.time();
+console.log(memoizedSum(5));
+console.timeEnd();