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Question 1

Which of the following is not a loop instruction in JavaScript?

Options :

A : for ... of

B : for ... in

C : do ... while

D : if ... else

Answer: D

Question 2

Analyze the following code:let point = {x: 10, y: 20};for (let f in point) { console.log(point[f]);}What will appear on the console as a result of its execution?

Options :

A : xy

B : 1020

C : point

D : 10

Answer: B

Question 3

Analyze the following code:let x = 10;function test() { let x = 20;} test();console.log(x);What will be displayed in the console as a result of its execution?

Options :

A : 10

B : undefined

C : Nothing will show up.

D : "x"

Answer: A

Question 4

Analyze the code below:

let a = 10;

do {

console.log(--a);

} while (a > 3);

Which statement can replace the do ... while from the example above?

Options :

A :

while (a >= 3)

console.log(a--);

B :

while (a > 2)

console.log(--a);

C : while (a > 3)

console.log(--a);

D : while (a > 3)

console.log(a--);

Answer: C

Question 5

Analyze the following code:let x = 10;ocnsole.log(x);What exception will be thrown as a result of its execution attempt?

Options :

A : RangeError

B : SyntaxError

C : TypeError

D : ReferenceError

Answer: D