AP
Size: a a a
AP
1
AP
D
undefined
? :)> if (a) console.log('a')
Uncaught ReferenceError: a is not defined
> let a
undefined
> if (a) console.log('a')
undefined
> typeof a
'undefined'
> typeof b
'undefined'
> a === b
Uncaught ReferenceError: b is not defined
LC
1
L
Э
TR
И
R
TR
TR
R
TR
М
М