Create Memoize

Author: letsdeepchat

Memoize

@@ -0,0 +1,38 @@
+/**
+ * @param {Function} fn
+ */
+/*
+Example 1:
+
+Input
+"sum"
+["call","call","getCallCount","call","getCallCount"]
+[[2,2],[2,2],[],[1,2],[]]
+Output
+[4,4,1,3,2]
+*/
+function memoize(fn) {
+    const cache = {};
+    return function(...args) {
+        const key = JSON.stringify(args);
+        if(key in cache){
+            return cache[key];
+        }
+        const result = fn.apply(this, args);
+        cache[key] = result;
+
+        return result;
+    }
+}
+
+
+/** 
+ * 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 
+ */