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The SharedArrayBuffer.prototype.slice() method returns a new SharedArrayBuffer whose contents are a copy of this SharedArrayBuffer's bytes from begin, inclusive, up to end, exclusive. If either begin or end is negative, it refers to an index from the end of the array, as opposed to from the beginning. This method has the same algorithm as Array.prototype.slice().

Syntax

sab.slice()
sab.slice(begin)
sab.slice(begin, end)

Parameters

begin Optional
Zero-based index at which to begin extraction.
A negative index can be used, indicating an offset from the end of the sequence. slice(-2) extracts the last two elements in the sequence.
If begin is undefined, slice begins from index 0.
end Optional
Zero-based index before which to end extraction. slice extracts up to but not including end.
For example, slice(1,4) extracts the second element through the fourth element (elements indexed 1, 2, and 3).
A negative index can be used, indicating an offset from the end of the sequence. slice(2,-1) extracts the third element through the second-to-last element in the sequence.
If end is omitted, slice extracts through the end of the sequence (sab.byteLength).

Return value

A new SharedArrayBuffer containing the extracted elements.

Examples

var sab = new SharedArrayBuffer(1024);
sab.slice();    // SharedArrayBuffer { byteLength: 1024 }
sab.slice(2);   // SharedArrayBuffer { byteLength: 1022 }
sab.slice(-2);  // SharedArrayBuffer { byteLength: 2 }
sab.slice(0, 1); // SharedArrayBuffer { byteLength: 1 }

Specifications

Specification Status Comment
ECMAScript Latest Draft (ECMA-262)
The definition of 'SharedArrayBuffer.prototype.slice' in that specification.
Draft Initial definition in ES2017.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support601 No2

573 4

55 — 57

46 — 555

No No10.1 —?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support601601 ?

573 4

55 — 57

46 — 555

No No ?

1. Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks. This is intended as a temporary measure until other mitigations are in place.

2. Support was removed to mitigate speculative execution side-channel attacks (Windows blog).

3. Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog).

4. From version 57: this feature is behind the javascript.options.shared_memory preference (needs to be set to true). To change preferences in Firefox, visit about:config.

5. From version 46 until version 55 (exclusive): this feature is behind the javascript.options.shared_memory preference (needs to be set to true). To change preferences in Firefox, visit about:config.

See also

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