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];
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
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
What is the equivalent of x *= 4?
A). x = x + 4
B). x = x / 4
C). x = x * 4
D). x = 4
Which of the following is the assignment operator in JavaScript?
A). =
B). ==
C). ===
D). !=
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;
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
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 outcome of let x = 8; x %= 3;?
A). 1
B). 2
C). 3
D). 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