Question

can someone explain me why my code isn’t working as I want to?

test = function(argument){
var arg = argument || true;
console.log(arg)
};
test(false);

and return is always true. I thought that it will only be true if argument is 'undefined'?
thanks for answers! 🙂

Answer 1

|| is the logical or operator. So false OR true evaluates to true.

undefined is falsey as well, so its a short hand for returning the right-hand side of the operator.

You might want this instead

var arg = typeof argument !== 'undefined' ? argument : true;