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1# Buffer From2 3A [ponyfill](https://ponyfill.com) for `Buffer.from`, uses native implementation if available.4 5## Installation6 7```sh8npm install --save buffer-from9```10 11## Usage12 13```js14const bufferFrom = require('buffer-from')15 16console.log(bufferFrom([1, 2, 3, 4]))17//=> <Buffer 01 02 03 04>18 19const arr = new Uint8Array([1, 2, 3, 4])20console.log(bufferFrom(arr.buffer, 1, 2))21//=> <Buffer 02 03>22 23console.log(bufferFrom('test', 'utf8'))24//=> <Buffer 74 65 73 74>25 26const buf = bufferFrom('test')27console.log(bufferFrom(buf))28//=> <Buffer 74 65 73 74>29```30 31## API32 33### bufferFrom(array)34 35- `array` &lt;Array&gt;36 37Allocates a new `Buffer` using an `array` of octets.38 39### bufferFrom(arrayBuffer[, byteOffset[, length]])40 41- `arrayBuffer` &lt;ArrayBuffer&gt; The `.buffer` property of a TypedArray or ArrayBuffer42- `byteOffset` &lt;Integer&gt; Where to start copying from `arrayBuffer`. **Default:** `0`43- `length` &lt;Integer&gt; How many bytes to copy from `arrayBuffer`. **Default:** `arrayBuffer.length - byteOffset`44 45When passed a reference to the `.buffer` property of a TypedArray instance, the46newly created `Buffer` will share the same allocated memory as the TypedArray.47 48The optional `byteOffset` and `length` arguments specify a memory range within49the `arrayBuffer` that will be shared by the `Buffer`.50 51### bufferFrom(buffer)52 53- `buffer` &lt;Buffer&gt; An existing `Buffer` to copy data from54 55Copies the passed `buffer` data onto a new `Buffer` instance.56 57### bufferFrom(string[, encoding])58 59- `string` &lt;String&gt; A string to encode.60- `encoding` &lt;String&gt; The encoding of `string`. **Default:** `'utf8'`61 62Creates a new `Buffer` containing the given JavaScript string `string`. If63provided, the `encoding` parameter identifies the character encoding of64`string`.65 66## See also67 68- [buffer-alloc](https://github.com/LinusU/buffer-alloc) A ponyfill for `Buffer.alloc`69- [buffer-alloc-unsafe](https://github.com/LinusU/buffer-alloc-unsafe) A ponyfill for `Buffer.allocUnsafe`70