Да

Нет

Не знаю

1.3e2

3

130

21

1 undefined 2 undefined 3 undefined 4 undefined

1 2 2 3 3 4

1 2 undefined 3 undefined 4

1 2 3 3 6 4

"Hello"

["world", "Hello", "javascript", 2, false]

["Hello", "javascript", 2, false]

"world"

undefined

22

false

string

NaN

false

"-33"

"3-30-33"

"0-33"

undefined

error

"name" "age" "id"

"name" "age" "id"

"name" "age"

"name" "age" console.log(id)

"Геннадий" 220 251

Error

John

name: "John"

undefined

null

error

2, 4, 6

, ,

function

ничего

throw an error

Noob

Junior

Middle

Senior

TeamLead

{} 100

{} 102

{ key: 100 } 100

undefined 100

{ key: 100 } 102