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node_modules/buffer-from/readme.md
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r789 | # Buffer From | |||
A [ponyfill](https://ponyfill.com) for `Buffer.from`, uses native implementation if available. | ||||
## Installation | ||||
```sh | ||||
npm install --save buffer-from | ||||
``` | ||||
## Usage | ||||
```js | ||||
const bufferFrom = require('buffer-from') | ||||
console.log(bufferFrom([1, 2, 3, 4])) | ||||
//=> <Buffer 01 02 03 04> | ||||
const arr = new Uint8Array([1, 2, 3, 4]) | ||||
console.log(bufferFrom(arr.buffer, 1, 2)) | ||||
//=> <Buffer 02 03> | ||||
console.log(bufferFrom('test', 'utf8')) | ||||
//=> <Buffer 74 65 73 74> | ||||
const buf = bufferFrom('test') | ||||
console.log(bufferFrom(buf)) | ||||
//=> <Buffer 74 65 73 74> | ||||
``` | ||||
## API | ||||
### bufferFrom(array) | ||||
- `array` <Array> | ||||
Allocates a new `Buffer` using an `array` of octets. | ||||
### bufferFrom(arrayBuffer[, byteOffset[, length]]) | ||||
- `arrayBuffer` <ArrayBuffer> The `.buffer` property of a TypedArray or ArrayBuffer | ||||
- `byteOffset` <Integer> Where to start copying from `arrayBuffer`. **Default:** `0` | ||||
- `length` <Integer> How many bytes to copy from `arrayBuffer`. **Default:** `arrayBuffer.length - byteOffset` | ||||
When passed a reference to the `.buffer` property of a TypedArray instance, the | ||||
newly created `Buffer` will share the same allocated memory as the TypedArray. | ||||
The optional `byteOffset` and `length` arguments specify a memory range within | ||||
the `arrayBuffer` that will be shared by the `Buffer`. | ||||
### bufferFrom(buffer) | ||||
- `buffer` <Buffer> An existing `Buffer` to copy data from | ||||
Copies the passed `buffer` data onto a new `Buffer` instance. | ||||
### bufferFrom(string[, encoding]) | ||||
- `string` <String> A string to encode. | ||||
- `encoding` <String> The encoding of `string`. **Default:** `'utf8'` | ||||
Creates a new `Buffer` containing the given JavaScript string `string`. If | ||||
provided, the `encoding` parameter identifies the character encoding of | ||||
`string`. | ||||
## See also | ||||
- [buffer-alloc](https://github.com/LinusU/buffer-alloc) A ponyfill for `Buffer.alloc` | ||||
- [buffer-alloc-unsafe](https://github.com/LinusU/buffer-alloc-unsafe) A ponyfill for `Buffer.allocUnsafe` | ||||