2

3

undefined

{ a: 3 }

4, 2, 3, 4

4, 2, 2, 4

3, 2, 3, 4

4, 2, 2, 3

'a', 'c', 3

'a', undefined, 3

undefined, undefined, 3

'a', 'c', undefined

undefined, 1, 2

ReferenceError: x is not defined

ReferenceError: Cannot access 'x' before initialization

1, 1, 2

1, 1

2, 4

2, 1

1, 4

finally, try

try, finally

try

finally

finally undefined, value 3

finally 2, value 3

finally undefined, value undefined

Uncaught (in promise) 1

10

20

undefined

ReferenceError: Cannot access 'x' before initialization

{ name: "Peter" }

{ name: "John" }

{ name: "Peter", age: 25 }

{ }