> Ruby does not require you to put the opening and closing parenthesis on a function to run that function, and it's not always put there when you have zero or 1 parameter

mind = blown

I always liked how functionName denotes the function and functionName() calls the function, and then it denotes the result e.g. in JavaScript or in math. But just saying functionName to call a function makes the code read more like English. Code that reads like English > code that reads like math. (And you can still talk about functions of course.)