undefined example:
console.log(a)
// memory reserved for a
var a = 5;
console.log(a)
Output:
undefined
5
Not defined example:
console.log(b)
// No memory is reserved
Output:
Uncaught reference error: b is not defined
undefined example:
console.log(a)
// memory reserved for a
var a = 5;
console.log(a)
Output:
undefined
5
Not defined example:
console.log(b)
// No memory is reserved
Output:
Uncaught reference error: b is not defined
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