✨ Proxy Cache

Author: tangweikun

src/structural/proxy/Sample-2.js

@@ -0,0 +1,19 @@
+// proxy cache【缓存代理】
+
+const multiply = function(...args) {
+  console.log("You can' see me if args in cache")
+  return args.reduce((product, n) => product * n, 1)
+}
+
+const proxyMultiply = (function() {
+  const cache = {}
+  return function() {
+    const argsKey = Array.prototype.join.call(arguments, '@')
+    if (argsKey in cache) return cache[argsKey]
+    return (cache[argsKey] = multiply(...arguments))
+  }
+})()
+
+console.log(proxyMultiply(3, 4))
+console.log(proxyMultiply(3, 4))
+console.log(proxyMultiply(5, 4))