Web Reference: If it is undefined, it will not be equal to a string that contains the characters "undefined", as the string is not undefined. You can check the type of the variable: Feb 22, 2011 · undefined cannot be an empty wall if the holder represents the variable. In this representation, undefined is an empty holder while null is an empty holder with post-it note empty. (so the unfortunate user knows it's useless to ask the cleaning lady for toilet paper). May 7, 2009 · An undeclared variable does not exist in Javascript memory whereas a declared one does and can be set to undefined. The difference is caused by Javascript design confusion. If a variable's value is undefined then it should be deleted. Indeed falsy values like 0, "", null, and undefined, are all basically meaningless and identical. A lot of time is wasted on them. They are all nothing and non ...
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