ArrayBuffer.prototype.resizable
Baseline
2024
Newly available
Since July 2024, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
The resizable accessor property of ArrayBuffer instances returns whether this array buffer can be resized or not.
Try it
const buffer1 = new ArrayBuffer(8, { maxByteLength: 16 });
const buffer2 = new ArrayBuffer(8);
console.log(buffer1.resizable);
// Expected output: true
console.log(buffer2.resizable);
// Expected output: false
Description
The resizable property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when the array is constructed. If the maxByteLength option was set in the constructor, resizable will return true; if not, it will return false.
Examples
Using resizable
In this example, we create a 8-byte buffer that is resizable to a max length of 16 bytes, then check its resizable property, resizing it if resizable returns true:
const buffer = new ArrayBuffer(8, { maxByteLength: 16 });
if (buffer.resizable) {
console.log("Buffer is resizable!");
buffer.resize(12);
}
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-get-arraybuffer.prototype.resizable |
Browser compatibility
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