void Keyword
Description
This operator allows evaluating expressions that produce a value into places where an
expression that evaluates to undefined is desired.
The void operator is often used merely to obtain the
undefined primitive value, usually using void(0) (which is
equivalent to void 0). In these cases, the global variable
undefined can be used.
It should be noted that the precedence
of the void operator should be taken into account and that
parentheses can help clarify the resolution of the expression following the
void operator:
void 2 === '2'; // (void 2) === '2', returns false void (2 === '2'); // void (2 === '2'), returns undefined