The programming model

So, we've just learned what a Lambda function looks like and some of the utilities that you get at runtime. Now, let's look at options for writing, deploying, and testing.

Runtimes

As we mentioned previously, Lambda supports multiple runtimes and allows you to build functions using Node.js, Python, Java, Go, Ruby, and .NET (C# and PowerShell). AWS often adds support for more runtimes (check the latest here: https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html), and recently released a feature that allows you to create your own custom runtime. This will allow you to bring your own language to Lambda using the Runtime API. We'll find out how this works in Chapter 6, Going Deeper...