A question about JavaScript

Question

(a==b)&&(return a)
Lazy people want to use short-circuit operation, but the result is an error, syntax error, unexpected token return

Answer 1

JavaScript logical AND operation, if the previous expression is true, then the value of the second expression is returned.

However, the return value of the expression return a is an "Illegal return statement", that is to say, it neither returns undefined, nor null or empty value, but should not return anything at all. Therefore, an error will be reported.

Answer 2

Can return be placed in an expression?

Answer 3

return a==b?a:undefined