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When used as a function return type, the void keyword specifies that the function doesn't return a value. When used for a function's parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is "universal."
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. The operator evaluates a given expression and then returns undefined.
If inserting an expression into a web page results in an unwanted effect, then use JavaScript void to remove it. Adding “javaScript:void(0)”, returns the undefined primitive value. The void operator is used to evaluate the given expression. After that, it returns undefined.
I came across this snippet in kriskowal/q:
/**
* Applies the promised function in a future turn.
* @param object promise or immediate reference for target function
* @param args array of application arguments
*/
Q.fapply = fapply;
function fapply(value, args) {
return dispatch(value, "apply", [void 0, args]);
}
What is the point of using the void keyword? Why not just write [undefined, args]?
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