Buffer的核心作用是用来缓冲，字面意思缓慢冲击。 比如你每秒要写100次硬盘，对系统冲击很大，浪费了大量时间忙着写处理，用个buffer缓冲区暂存起来，变成每秒要写10次硬盘，对系统冲击极大程度缓解了，因为写入效率变高了。

Here, the buffer array is used to store the data read by read (2) until it's written; then the buffer is re-used. There are more complicated buffer schemes used, for example a circular buffer, where some finite number of buffers are used, one after the next; once the buffers are all full, the index "wraps around" so that the first one is re-used.

Jan 31, 2017 · I have a JSON object and I'm converting it to a Buffer and doing some process here. Later I want to convert the same buffer data to convert to valid JSON object. I'm working on Node V6.9.1 Below ...

Buffers are associated with a specific block device, and cover caching of filesystem metadata as well as tracking in-flight pages. The cache only contains parked file data. That is, the buffers remember what's in directories, what file permissions are, and keep track of what memory is being written from or read to for a particular block device. The cache only contains the contents of …

The buffer in this case is a sub-string, starting at position 6 with length 5, and it doesn't take extra storage space - it references a slice of the string. This isn't very useful for short strings like this, but it can be necessary when using large amounts of data.

The Buffer constructor is a global object, so no require is needed. Buffers created with strings can take an optional encoding parameter to specify what encoding the string is in.

Jan 11, 2013 · I wrote a pretty simple function that downloads an image from a given URL, resize it and upload to S3 (using 'gm' and 'knox'), I have no idea if I'm doing the reading of a stream to a buffer correc...

May 17, 2012 · Since buffer is a pointer (not an array), the sizeof operator returns the size of a pointer, not the size of the buffer it points to. There is no standard way to determine this size, so you have to do the bookkeeping yourself (i.e. remember how much you allocated.)

Aug 9, 2021 · It turns out that there is third-party plugin that provides all node.js polyfills (not just Buffer) out of the box: node-polyfill-webpack-plugin. It brings all polyfills as its own dependancies, so you should use excludeAliases config property …

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