JavaScript for Google "apps" (Docs, Sheets, Slides... )
Apps Script | Google Developers
Increase the power of your favorite Google apps — like Calendar, Docs, Drive, Gmail, Sheets, and Slides. Apps Script lets you do more with Google, all on a modern JavaScript platform in the cloud. Build solutions to boost your collaboration and productivity.Google Apps Script Complete Course Beginner to Advanced @Udemy
competition: Microsoft Office
Microsoft's New Programming Language for Excel Now Turing Complete -- Visual Studio Magazine
Microsoft, which calls its Excel spreadsheet a programming language, reports that an effort called LAMBDA to make it even more of a programming language is paying off, recently being deemed Turing complete.