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doc: demonstrate the dangers of buffer.slice() #41627

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doc: demonstrate the dangers of buffer.slice() #41627

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18 changes: 18 additions & 0 deletions doc/api/buffer.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3427,6 +3427,15 @@ console.log(copiedBuf.toString());

console.log(buf.toString());
// Prints: buffer

// With buffer.slice(), the original buffer is modified.
const notReallyCopiedBuf = buf.slice();
notReallyCopiedBuf[0]++;
console.log(notReallyCopiedBuf.toString());
// Prints: cuffer

console.log(buf.toString());
// Also prints: cuffer (!)
```

```cjs
Expand All @@ -3441,6 +3450,15 @@ console.log(copiedBuf.toString());

console.log(buf.toString());
// Prints: buffer

// With buffer.slice(), the original buffer is modified.
const notReallyCopiedBuf = buf.slice();
notReallyCopiedBuf[0]++;
console.log(notReallyCopiedBuf.toString());
// Prints: cuffer

console.log(buf.toString());
// Also prints: cuffer (!)
```

### `buf.swap16()`
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