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2623-memoize/2623-memoize.js

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+/**
+ * @param {Function} fn
+ * @return {Function}
+ */
+function memoize(fn) {
+    memo = {}
+    return function(...args) {
+        let key = JSON.stringify(args)
+        let val = memo[key]
+        if (val !== undefined) return val
+
+        val = fn(...args)
+        memo[key] = val
+        return val
+    }
+}
+
+
+/** 
+ * let callCount = 0;
+ * const memoizedFn = memoize(function (a, b) {
+ *	 callCount += 1;
+ *   return a + b;
+ * })
+ * memoizedFn(2, 3) // 5
+ * memoizedFn(2, 3) // 5
+ * console.log(callCount) // 1 
+ */