When creating a variable, do you need to use let or var at all if the variable ISN’T going to be a constant? The code still seems to record the variable just fine, and allow changes, whether I use var/let or not. ?
Same with spaces between the +, -, / etc. The code seems to work just fine without the extra spaces so do I really need them, or it’s just accepted practice, or the “standard” that people put spaces between those characters for neatness (or whatever)?