Mastering JavaScript Functional Programming - Second Edition

Order of execution

Another way of looking at what we have been saying in this chapter is to see pure functions as robust. You know that their execution—in whichever order—won't ever have any sort of impact on the system. This idea can be extended further: you could evaluate pure functions in parallel, resting assured that results wouldn't vary from what you would get in a single-threaded execution.

Unfortunately, JavaScript greatly restricts us in our parallel programming. We can make do, in very restricted ways, with web workers, but that's about as far as it goes. For Node developers, the cluster module may help out, though it isn't actually an alternative to threads, and only lets you spawn multiple processes, letting you use all available ...