Shorthand if/else statement Javascript

Question

I\'m wondering if there\'s a shorter way to write this:

var x = 1;
if(y != undefined) x = y;

I initially tried x = y || 1, but

Answer 1

Another way to write it shortly

bePlanVar = !!((bePlanVar == false));

// is equivalent to

bePlanVar = (bePlanVar == false) ? true : false;

// and 

if (bePlanVar == false) {
    bePlanVar = true;
} else {
    bePlanVar = false;
}