Node.js中的缓冲区是什么？ [英] What is a buffer in Node.js?

问题描述

您可以阅读有关Buffer类的Node.js文档，即一个缓冲区

类似于整数数组，但对应于V8堆之外的原始内存分配。

到目前为止，还不错。

现在让我感到困惑的是，从技术上讲缓冲是个问题。

是它的数组吗？

$ b $还是有更多的函数？

b

解决方案

缓冲区是一块内存，就像在C / C ++中一样。您可以将此内存解释为各种长度的整数或浮点数的数组，也可以解释为二进制字符串。与数组等高级数据结构不同，缓冲区不可调整大小。

它大致对应于：

• char * 或 char [] 在C / C ++中


• byte [] in Java


• 可变的 bytes 或Python中不可调整大小的 bytearray


• 如果可变，则是php中的字符串

As you can read in the Node.js documentation on the Buffer class, a buffer

is similar to an array of integers but corresponds to a raw memory allocation outside the V8 heap.

So far, so good.

What now puzzles me is the question what a buffer is technically speaking. Is it an array with just some additional functions for creating and converting to strings using specific encodings?

Or is there "more" to it?

解决方案

A Buffer is a chunk of memory, just like you would have it in C/C++. You can interpret this memory as an array of integer or floating point numbers of various lengths, or as a binary string. Unlike higher-level data structures like arrays, a buffer is not resizable.

It corresponds roughly to:

• char* or char[] in C/C++
• byte[] in Java
• A mutable bytes or a non-resizable bytearray in Python
• Strings in php if they were mutable

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