Continuing the discussion from freeCodeCamp Challenge Guide: Arguments Optional:
I don’t fully understand the logic of this solution. What does it mean when you put const [something here]. I understand that it sets first and second to the arguments object inputs but why is the [ ] needed? Does it create an array?
Also, I don’t fully understand how the second argument is accessed if it is not included in the original parameters of the function. For example, addTogether(2)(). How is the  accessed by arguments if it’s not an argument in the original call addTogether(2)?