The function to be executed during the creation of the promise. Any errors thrown in the executor will cause the promise to be rejected. The return value of the executor is always ignored
Optionaltimeout: numberOptional timeout to wait before processing the items, defaults to zero.
Creates an asynchronous Promise instance that when resolved or rejected will execute it's pending chained operations asynchronously using the optional provided timeout value to schedule when the chained items will be ececuted.