Instead of testing the function by manually adding a PNG file to the S3 bucket as I did before, this time I’ll use the test hooks built into Lambda. Back to the homepage for my function: ...

While I focus on AWS Lambda here, the same general principles will apply to using Microsoft Azure Functions, Google Cloud Functions, IBM Cloud Functions, Oracle Functions, and other FaaS platforms.

It’s just hard to think up that many disposable function names. However, if you use gcc, there are some nonstandard C features you can use to get most of what you want out of lambda expressions.