Building your first function

The heart of Functions as a Service is, of course, the function. In Amazon Web Services, these are deployed using the service AWS Lambda. That's not the only AWS feature we'll use, as we've already mentioned. Once we have a function, we need a way to execute it. This is done via one or more triggers, and the function itself has tasks it needs to perform, so we'll demonstrate more service usage via API calls when we finally write the function.

It might be helpful at this point, given that our application is structured significantly differently than anything else we've looked at, to look at a system diagram:

Here's ...

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