A: Hello there,

B: Hello there, undefined

C: Hello there, null

D: ReferenceError

A: 20 и 62.83185307179586

B: 20 и NaN

C: 20 и 63

D: NaN и 63

A: 1 va false

B: false va NaN

C: false va false

A: mouse.bird.size

B: mouse[bird.size]

C: mouse[bird["size"]]

D: Hamma variantlar toʻgʻri

A: Hello

B: Hey!C: undefined

D: ReferenceError

E: TypeError

A: true false true

B: false false true

C: true false false

D: false true true

A: orange

B: purple

C: green

D: TypeError

A: Woah some cool data

B: Oh finally!

C: Woah some cool data Oh finally!

D: Oops didn't work Oh finally!

A: Person {firstName: "Lydia", lastName: "Hallie"} и undefined

B: Person {firstName: "Lydia", lastName: "Hallie"} и Person {firstName: "Sarah", lastName: "Smith"}

C: Person {firstName: "Lydia", lastName: "Hallie"} и {}

D:Person {firstName: "Lydia", lastName: "Hallie"} и ReferenceError

A: NaN

B: TypeError

C: "12"

D: 3