I was wondering whether someone has a deeper understanding of how the different FaaS or serverless offerings of the different cloud providers are effectively implemented backend or infrastructure wise. (AWS Lambda, Azure functions, Google Cloud Functions, ...)

Language support:

AWS: Java, Node.js, C#, Python

Azure: JavaScript, C#, Python, PHP, Bash, Batch, PowerShell

Google: JavaScript

Google Cloud Functions seems to be based on a managed Node.js environment and is hence limited to .js (https://cloud.google.com/functions/docs/concepts/overview)

AWS and Azure support a multitude of different languages which may look like an ideal docker use case from far. Does anyone know some real facts here?