Learn Functional Programming by Building a Spreadsheet

Tell us what’s happening:

The whole task from 1 to 105 is strange enough. There were lot’s of simple same examples in previous task, but here there aren’t any exmples to check what are you doing during the task full fill (like console.log(smth) to more undersrand). You can’t see any intermediate result. Too strange task…
P.S. Sory for my bad eng(