本篇技术指南以 Modern JavaScript Tutorial（javascript.info）仓库中 6-calculator-extendable 练习为骨架，完整剖析一个"可扩展计算器"的构造器函数实现：既能解析 "NUMBER operator NUMBER" 形式的字符串表达式，又能通过 addMethod 在运行时动态注册新运算符。读完本文，你将掌握 ...

导读 ：递归代码虽然直观优雅，却往往因重复计算和函数调用开销而成为性能瓶颈。本文以计算斐波那契数列第 n 项为贯穿案例，系统讲解 30 seconds of code 项目中总结的两大优化技巧—— 计算结果记忆化（Memoization） 与 改用迭代实现 ，并结合仓库源码剖析两者的执行过程、资源开销与适用场景。读 ...

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