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buffer

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buffer

Node.js Buffer API, for the browser

  • 6.0.3
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What is buffer?

The 'buffer' npm package provides a way to handle binary data in Node.js. It implements the Buffer class, which is a global type for dealing with binary data directly. Buffers are similar to arrays of integers but correspond to fixed-sized, raw memory allocations outside the V8 heap. They are useful when working with TCP streams, file system operations, and other contexts where it's necessary to handle raw binary data.

What are buffer's main functionalities?

Creating Buffers

This code sample demonstrates how to create a new Buffer instance from a given string and encoding. The 'from' method is a static method on the Buffer class used to allocate a new Buffer that contains the given string.

const buffer = Buffer.from('Hello World', 'utf8');

Writing to Buffers

This code sample shows how to write to a buffer. The 'alloc' method creates a new Buffer of a specified size, and the 'write' method writes a string to the buffer at a specified offset using a given encoding.

const buffer = Buffer.alloc(10); buffer.write('Hello', 0, 'utf8');

Reading from Buffers

This code sample illustrates how to read data from a buffer. The 'toString' method converts the buffer's contents to a string using the specified encoding.

const buffer = Buffer.from('Hello World'); const string = buffer.toString('utf8');

Manipulating Buffers

This code sample demonstrates how to concatenate two buffers into a new buffer using the 'concat' method.

const buffer1 = Buffer.from('Hello'); const buffer2 = Buffer.from('World'); const concatenated = Buffer.concat([buffer1, buffer2]);

Buffer Slicing

This code sample shows how to create a new buffer that references the same memory as the original buffer but with the specified start and end indices, effectively creating a slice of the original buffer.

const buffer = Buffer.from('Hello World'); const slice = buffer.slice(0, 5);

Other packages similar to buffer

    typedarray

    The 'typedarray' package provides an implementation of Typed Arrays, which are array-like views of binary data buffers. While similar to Node.js Buffers, Typed Arrays are part of the ECMAScript standard and are available in browsers as well as Node.js.

    bl

    The 'bl' (Buffer List) package is a storage object for collections of Node.js Buffers. Unlike the Buffer class, which deals with single Buffer instances, 'bl' provides a way to join multiple buffers into one continuous buffer and still maintain access to the individual buffers.

    concat-stream

    The 'concat-stream' package is a writable stream that concatenates all the data from a stream and calls a callback with the result. It is similar to the Buffer.concat method but works with streams, collecting data chunks and concatenating them into a single buffer or string.

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Package last updated on 23 Nov 2020

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