Summary

And there you have it: the concurrent processing of multiple file inputs! Concurrent programming can be a valuable tool for creating performant applications by allowing IO-bound workloads to be broken up so that some portion of work is always executing. Additionally, it can be used to reduce the memory footprint of an application by simultaneously processing input as it comes, without needing to wait and load all of the data into memory.

At this point, our CLI is almost complete! It is now able to efficiently handle both single and multiple file inputs. It can stream data to reduce memory usage and is set up to easily support library usages. Next up, we are going to do something a bit different: we are going to support emitting desktop notifications on various events within our CLI. To accomplish this, in the next chapter, we are going to learn about Crystal's ability to bind to C libraries.