Why use the void keyword? [duplicate]

Answer 1

From the MDN Docs of void

Syntax

void expression

Uses

This operator allows inserting expressions that produce side effects 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 instead (assuming it has not been assigned to a non-default value).

And why? See MDN Undefined

In older versions of JavaScript undefined could be overridden, but in starting in JavaScript 1.8.5, undefined is non-writable, as per the ECMAScript 5 specification.

Answer 2

The void is an important keyword in JavaScript which can be used as a unary operator that appears before its single operand, which may be of any type.

This operator specifies an expression to be evaluated without returning a value. Its syntax could be one of the following