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# 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`