ArrayBuffer.prototype.slice()
BaselineWidely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Theslice() method ofArrayBuffer instances returns a newArrayBuffer whose contents are a copy of thisArrayBuffer's bytes fromstart, inclusive, up toend, exclusive. If eitherstart orend is negative, it refers to an index from the end of the array, as opposed to from the beginning.
Try it
// Create an ArrayBuffer with a size in bytesconst buffer = new ArrayBuffer(16);const int32View = new Int32Array(buffer);// Produces Int32Array [0, 0, 0, 0]int32View[1] = 42;const sliced = new Int32Array(buffer.slice(4, 12));// Produces Int32Array [42, 0]console.log(sliced[0]);// Expected output: 42Syntax
js
slice()slice(start)slice(start, end)Parameters
startOptionalZero-based index at which to start extraction,converted to an integer.
- Negative index counts back from the end of the buffer — if
-buffer.length <= start < 0,start + buffer.lengthis used. - If
start < -buffer.lengthorstartis omitted,0is used. - If
start >= buffer.length, an empty buffer is returned.
- Negative index counts back from the end of the buffer — if
endOptionalZero-based index at which to end extraction,converted to an integer.
slice()extracts up to but not includingend.- Negative index counts back from the end of the buffer — if
-buffer.length <= end < 0,end + buffer.lengthis used. - If
end < -buffer.length,0is used. - If
end >= buffer.lengthorendis omitted isundefined,buffer.lengthis used, causing all elements until the end to be extracted. - If
endimplies a position before or at the position thatstartimplies, an empty buffer is returned.
- Negative index counts back from the end of the buffer — if
Return value
A newArrayBuffer containing the extracted elements. It is notresizable, even if the original was.
Examples
Copying an ArrayBuffer
js
const buf1 = new ArrayBuffer(8);const buf2 = buf1.slice(0);Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-arraybuffer.prototype.slice |