Functional programming with arrays Although JavaScript’s arrays are very capable out of the box, the functional paradigm improves the clarity and maintainability of array code.

There are new array methods in JavaScript and they are here to make our programs more predictable and maintainable.

跟上面的 Array.Copy 第二个重载一样，需要分别指定两个数组的偏移值 8Buffer.MemoryCopy 这个是 unsafe 方法，需要用到指针 😀 理论上是性能最好的 我最喜欢的就是这个方法 （逼格高） 使用 unsafe 代码，请先在编译选项里面开启 allow unsafe code 选项。

Copying Arrays As demonstrated in the Arrays section of the Java Tutorials, the System class provides an arraycopy method that can be used to copy the contents from one array into another.