byteLength accessor property represents the length of an
ArrayBuffer in bytes.
byteLength 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 and cannot be changed. This property returns 0 if this
ArrayBuffer has been detached.
var buffer = new ArrayBuffer(8); buffer.byteLength; // 8
|ECMAScript Language Specification (ECMAScript)|
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