title: Does VBScript's IsEmpty have an equivalent in JavaScript?
body: <p>Using Javascript, is there an equivalent function or functionality so VBScript's IsEmpty function?  The VBScript function returns whether the given variable is "empty", e.g. since all the variables are actually VARIANTs, whether or not the VARIANT has a vt of VT_EMPTY, whereas most of what I've found for Javascript is string-specific or not generalizable.</p>