The static Atomics.sub()
method substracts a given value
at a given position in the array and returns the old value at that position. This atomic
operation guarantees that no other write happens until the modified value is written
back.
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Syntax
Atomics.sub(typedArray, index, value)
Parameters
typedArray
- An integer typed array. One of
Int8Array
,Uint8Array
,Int16Array
,Uint16Array
,Int32Array
,Uint32Array
,BigInt64Array
, orBigUint64Array
. index
- The position in the
typedArray
to subtract avalue
from. value
- The number to subtract.
Return value
The old value at the given position
(typedArray[index]
).
Exceptions
- Throws a
TypeError
, iftypedArray
is not one of the allowed integer types. - Throws a
RangeError
, ifindex
is out of bounds in thetypedArray
.
Examples
Using sub
const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);
ta[0] = 48;
Atomics.sub(ta, 0, 12); // returns 48, the old value
Atomics.load(ta, 0); // 36
Specifications
Browser compatibility
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