Website Developer Question:
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Tell me how Do You Distinguish Between An Undefined And Undeclared Variable?
Answer:
Undefined refers to a variable which has declaration but not initialized yet. However, an undeclared variable is one which has a reference in the code without being declared.
Example.
var iExistButUndefined;
alert(iExistButUndefined); // undefined
alert(iMNotDeclared); // accessing an undeclared variable
Example.
var iExistButUndefined;
alert(iExistButUndefined); // undefined
alert(iMNotDeclared); // accessing an undeclared variable
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