# buffer-from

> A [ponyfill](https://ponyfill.com) for `Buffer.from`, uses native implementation if available.

Latest version **1.1.2** (published 2021-07-29) · MIT license · 0 weekly downloads

## Install

```sh
npm install buffer-from
pnpm add buffer-from
yarn add buffer-from
bun add buffer-from
```

## Health

**Score 23/100 (F)** — status: abandoned.

Positive: has types package; no vulnerabilities; high quality score.

Warnings: low downloads; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 1.1.2 |
| Published | 2021-07-29 |
| First published | 2016-08-18 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | separate (@types/buffer-from) |
| Module format | CommonJS |
| Dependencies | 0 |
| Unpacked size | 4.9 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 25 |
| Maintainers | linusu |
| Keywords | buffer, buffer from |

## Links

- npm: https://www.npmjs.com/package/buffer-from
- Repository: https://github.com/LinusU/buffer-from
- Homepage: https://github.com/LinusU/buffer-from#readme
- Issues: https://github.com/LinusU/buffer-from/issues
- npm.io page: https://npm.io/package/buffer-from

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## Recent versions

- 1.1.2 (latest) — 2021-07-29
- 1.1.1 — 2018-07-31
- 1.1.0 — 2018-05-29
- 1.0.0 — 2018-03-12
- 0.1.2 — 2018-03-12
- 0.1.1 — 2016-10-16
- 0.1.0 — 2016-08-18

## README

# 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` &lt;Array&gt;

Allocates a new `Buffer` using an `array` of octets.

### bufferFrom(arrayBuffer[, byteOffset[, length]])

- `arrayBuffer` &lt;ArrayBuffer&gt; The `.buffer` property of a TypedArray or ArrayBuffer
- `byteOffset` &lt;Integer&gt; Where to start copying from `arrayBuffer`. **Default:** `0`
- `length` &lt;Integer&gt; 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` &lt;Buffer&gt; An existing `Buffer` to copy data from

Copies the passed `buffer` data onto a new `Buffer` instance.

### bufferFrom(string[, encoding])

- `string` &lt;String&gt; A string to encode.
- `encoding` &lt;String&gt; 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`

---
_Source: https://npm.io/package/buffer-from · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._