Undefined: Description The undefined property indicates that a

Description The undefined property indicates that a variable has not been assigned a value, or not declared at all. Although undefined and null have some functional overlap, they have different purposes. In the strictest sense, null represents a value intentionally defined as "blank," and undefined represents a lack of any assigned value. Undefined definition: without fixed limits; indefinite in form, extent, or application.. See examples of UNDEFINED used in a sentence. Press enter or click to view image in full size Ever stumbled upon JavaScript errors and wondered what undefined and not defined really mean? Discover the key differences between these common ...