What is the difference between undefined and not defined in JavaScript?

Answer 1

Undefined: variable was declared ( with the statement-keyword 'var' ), but not assigned with a value.
Not defined: variable does'nt have been declared at all...

Declaration without assignement:
var my_var;

Assignement:
my_var = 5;

Declaration and assignement:
var my_var = 5

Answer 2

Thanks visph

Answer 3

Yes guys

Answer 4

Thanks so much

Answer 5

var x;
console.log(x);
console.log(y);

1.The o/p for console.log(x) will be: undefined(Declaration without defined)

2.The o/p for console.log(y) will be: not defined