String是不可变对象，每次修改都会产生新对象。如果你在循环里用“+”拼接10000次，就会产生10000个中间字符串对象，这不仅是内存浪费，还会加剧GC压力。StringBuffer和StringBuilder就是解决这个问题的——它们在内部维护一个可变的字符数组，拼接操作直接修改数组内容，避免了大量中间对象的产生。

理解String、StringBuilder、StringBuffer三者的底层原理，是写出高性能代码的基础。 String具备不可变性与常量池驻留机制，天然线程安全，但频繁拼接会产生大量临时对象；StringBuilder基于可变字符数组设计，在单线程拼接场景下性能最优；StringBuffer则在方法级别加锁，适用于多线程共享可变字符串的少数场景。

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Implemented with N-API. Operating strings in a scalable buffer. Multiple types of data are allowed to input.

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