How does javascript logical assignment work?

Question

In javascript, if we have some code such as

var a = \"one\";
var b = q || a;
alert (b);

The logical OR operator will assign a\'s value to b

Answer 1

I'm not quite sure I follow your question. You can use an expression anywhere you can use an expression, and a logical operator on two expressions results in an expression.

alert(q||a);
alert(true||false);

var x=5;
var y=0;
if (y!=0 && x/y>2) { /*do something*/ }

The last bit is useful. Like most languages, Javascript 'short-circuits' ANDs and ORs. If the first part of an AND is false, it doesn't evaluate the second bit - saving you a divide-by-0. If the first part of an OR is true, it doesn't evaluate the second.

But you can use boolean operators anywhere you can use an expression.