What are the differences between `var` and `let`? Are they necessary?

[stetim94]

@25hz

When creating a variable, do you need to use let or var at all if the variable ISN’T going to be a constant?

do you need to? No. Should you? Yes.

the keyword (var or let) indicates the scope of the variable, without var, let or const the variable has a global scope. Which is far from ideal

@25hz

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)?

for readability, the spaces are recommended