Google Cloud Functions is a serverless environment for building and connecting cloud services. Developers and users write simple-purpose functions that are executed in response to an event that may be generated from your cloud instances or infrastructure. When the event being watched is triggered, the cloud function executes in a fully managed environment. This kind of approach saves a lot of time because a developer need not worry about having to deploy the underlying infrastructure that is required to run their code. Cloud functions remove the additional overhead of managing the environment and give a developer a fully managed execution environment that can readily be used.

Cloud functions are written in JavaScript and execute in a Node.js v6.11.5 environment. Because cloud functions execute in a Node.js environment, you can easily build and test the function...