We've seen a simple string posted to and from workers. Now we can see that more complex objects can be sent as well. In fact, a sizable number of types can be passed via postMessage.
To see a full list of valid types, visit the link:
https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm.
By using postMessage, we have copied the data to the worker. This operation is costly, because whenever the message is posted to a new thread, the data must be duplicated in order to be available. For small datasets, this isn't a problem, but for larger sets it can be slow and memory-intensive. For future recipes in this chapter, we'll be using shared memory to avoid this copying.
