[The fourth in an (at least) 6-part series, all code on GitHub as always.]

1. Node.js
2. Node.js + AWS Lambda
3. Python 2.7 + AWS Lambda
4. PureScript
5. PureScript + AWS Lambda
6. Bonus: PureScript + Twitter Streaming

I know, you're thinking, "I've already read three parts of this series, and I haven't heard one …