Question

I saw some variables like this:

var comparison = <condition> || /* It could be "&&" too */ <condition>;

I don’t know what it is and what can it do?
Tks you so much!

Answer 1

They’re called logical operators (MDN):

expr1 && expr2 : Returns expr1 if it can be converted to false; otherwise, returns expr2. Thus, when used with Boolean values, && returns true if both operands are true; otherwise, returns false.

expr1 || expr2 : Returns expr1 if it can be converted to true; otherwise, returns expr2. Thus, when used with Boolean values, || returns true if either operand is true; if both are false, returns false.