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 does let { a: alpha, b: beta } = { a: 1, b: 2 }; do?
A). Creates variables alpha and beta with values 1 and 2
B). Creates variables a and b with values 1 and 2
C). Throws an error
D). Assigns default values
Which of the following is the assignment operator in JavaScript?
A). =
B). ==
C). ===
D). !=
How to increment a variable count by 1?
A). count + 1
B). count += 1
C). count =+ 1
D). count = 1
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
Can a constant objects properties be changed?
A). Yes
B). No
C). Only if redeclared
D). Only with special methods
Which operator assigns a remainder to a variable?
A). +=
B). -=
C). *=
D). %=
What does the assignment operator = do in JavaScript?
A). Compares two values
B). Assigns a value to a variable
C). Checks for equality
D). None of the above
What will be the value of x after the following code: let x = 10; x += 5;
A). 5
B). 10
C). 15
D). 20
Which assignment will fail?
A). const x = 10; x = 20;
B). let y = 5; y = 10;
C). var z = 15; z = 30;
D). let a = { b: 2 }; a.b = 3;