What will be the value of x after the following code: let x = 10; x += 5;

What does const do in JavaScript?

A). Declares a block-scoped variable

B). Declares a constant value

C). Declares a global variable

D). Declares a function

What will be the result of let { a, b } = { a: 3, b: 4 };?

A). a is 4, b is 3

B). a is 3, b is 4

C). a is undefined, b is undefined

D). a is null, b is null

What will be the output of let { a, b } = { a: 1, b: 2, c: 3 };?

A). a is 1, b is 2

B). a is 2, b is 3

C). a is 1, b is undefined

D). a is 3, b is undefined

What is the outcome of let x = 8; x %= 3;?

A). 1

B). 2

C). 3

D). 5

What will let x = 5, y = 10; [x, y] = [y, x]; do?

A). Nothing

B). Throws an error

C). Swaps values of x and y

D). None of the above

Which of these correctly assigns values to variables using array destructuring?

A). [x, y, z] = [1, 2, 3]

B). [1, 2, 3] = [x, y, z]

C). let [x y z] = [1 2 3];

D). (x, y, z) = [1, 2, 3];

How to increment a variable count by 1?

A). count + 1

B). count += 1

C). count =+ 1

D). count = 1

Can a constant objects properties be changed?

A). Yes

B). No

C). Only if redeclared

D). Only with special methods

How can you swap the values of two variables a and b in one line?

A). [a, b] = [b, a]

B). a = b, b = a

C). a == b, b == a

D). a === b, b === a

What is the result of let x = 10; x -= 3;?

A). 7

B). 13

C). 10

D). 3