The Symbol.asyncIterator static data property represents the well-known symbol @@asyncIterator. The async iterable protocol looks up this symbol for the method that returns the async iterator for an object. In order for an object to be async iterable, it must have an @@asyncIterator key.

The Symbol.isConcatSpreadable static data property represents the well-known symbol @@isConcatSpreadable. The Array.prototype.concat() method looks up this symbol on each object being concatenated to determine if it should be treated as an array-like object and flattened to its array elements.

The Atomics.and() static method computes a bitwise AND with 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.

The Atomics.notify() static method notifies up some agents that are sleeping in the wait queue.

The detached accessor property of ArrayBuffer instances returns a boolean indicating whether or not this buffer has been detached (transferred).

The byteLength accessor property of ArrayBuffer instances returns the length (in bytes) of this array buffer.

The Atomics.compareExchange() static method exchanges a given replacement value at a given position in the array, if a given expected value equals the old value. It returns the old value at that position whether it was equal to the expected value or not. This atomic operation guarantees that no other write happens until the modified value is written back.

The Atomics.waitAsync() static method waits asynchronously on a shared memory location and returns a Promise.

The Atomics.wait() static method verifies that a shared memory location still contains a given value and if so sleeps, awaiting a wake-up notification or times out. It returns a string which is either "ok", "not-equal", or "timed-out".

The Atomics.or() static method computes a bitwise OR with 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.