Canceling Asynchronous Operations

Being able to stop a long-running operation is particularly useful if the operation has been canceled by the user or if it has become redundant. In multithreaded programming, we can just terminate the thread, but on a single-threaded platform such as Node.js, things can get a little bit more complicated.

Note: In this section, we’ll be talking about canceling asynchronous operations and not about canceling promises, which is a different matter altogether. By the way, the Promises/A+ standard doesn’t include an API for canceling promises. However, we can use a third-party promise library such as bluebird if we need such a feature. Note that canceling a promise doesn’t mean that the operation the ...