This course requires a rudimentary understanding of very basic Javascript concepts and of what an array is. Nevertheless, if you want to come in blind you should be able to pick things up with a bit of Googling.
One of the major regular tasks that Google Apps Scripts can do for Google Sheets is to automate the transformation of data from one state to another.
Sometimes this task can simply be accomplished by building dynamic templates using the vast functionality of Google Sheets. Other times automation via Google Apps Script is a better tool for the job.
Source: Google Apps Script Course – Intro: 2D Array Data Transformation for Google Sheets – Yagisanatode
