What are undeclared and undefined variables?
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Answer / Sudhir Kumar Tiwari
Undeclared variables are variables that have not been declared with the var, let, or const keyword. They will automatically create a global variable if they are used outside of a function, but will cause a ReferenceError within a function. On the other hand, undefined variables are declared but have not been assigned any value. They will return undefined when accessed and do not throw an error.
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