Website Developer Interview Question:

Tell me how Do You Distinguish Between An Undefined And Undeclared Variable?

Submitted by: Muhammad

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
Submitted by: Muhammad