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doc: buffer.from will return internal pool buffer #24312

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ce878bb
doc: Buffer.from will return internal pool buffer
mritunjayz Nov 11, 2018
0c3566b
doc: buffer.from willreturn pooled buffer
mritunjayz Nov 11, 2018
7b7c4b4
length condition removed
mritunjayz Nov 17, 2018
d1f3b51
buffer.from() tiny doc nit change
mritunjayz Nov 24, 2018
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doc: Buffer.from will return internal pool buffer
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@mritunjayz
mritunjayz committed Nov 11, 2018
commit ce878bbb8b08f7ee9dd1a94fbc80fa8c3fa70512
21 changes: 21 additions & 0 deletions doc/api/buffer.md
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Expand Up @@ -788,6 +788,27 @@ const buf = Buffer.from([0x62, 0x75, 0x66, 0x66, 0x65, 0x72]);

A `TypeError` will be thrown if `array` is not an `Array`.

`Buffer.from(array)` will also use the internal `Buffer` pool if `array.length` is less than or equal to half [`Buffer.poolSize`] just like [`Buffer.allocUnsafe()`] does.

```js
const nodeBuffers = new Buffer.from([0, 1, 2, 3, 4, 5, 6, 7,8, 9]);

console.log(nodeBuffers.offset);
// prints: 344
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@ChALkeR ChALkeR Mar 2, 2019

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This is not always correct. It may return 0, and any subsequent call will probably increase it.
So it doesn't always print 344.

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@vsemozhetbyt vsemozhetbyt Mar 2, 2019

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// prints: 344
// Prints: 344


// Default Buffer.poolsize is 8192
console.log(Buffer.poolSize);
// prints: 8192
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@vsemozhetbyt vsemozhetbyt Mar 2, 2019

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// prints: 8192
// Prints: 8192


// But you can change it
Buffer.poolSize=5;

const buf = new Buffer.from([0, 1, 2, 3, 4, 5, 6, 7,8, 9]);

console.log(buf.offset);
// prints: 0
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@vsemozhetbyt vsemozhetbyt Mar 2, 2019

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// prints: 0
// Prints: 0

```

### Class Method: Buffer.from(arrayBuffer[, byteOffset[, length]])
<!-- YAML
added: v5.10.0
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