How to use destructuring to extract properties from an object?
A). { a, b } = { a: 1, b: 2 }
B). let { a, b } = { a: 1, b: 2 };
C). let a, b = { a: 1, b: 2 };
D). let (a, b) = { a: 1, b: 2 };
Which of the following is the assignment operator in JavaScript?
A). =
B). ==
C). ===
D). !=
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 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
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 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 is the outcome of let x = 8; x %= 3;?
A). 1
B). 2
C). 3
D). 5
How to increment a variable count by 1?
A). count + 1
B). count += 1
C). count =+ 1
D). count = 1
What will const x = { a: 1 }; x.a = 2; do?
A). Throw an error
B). Change x.a to 2
C). Change x to 2
D). Do nothing
How do you assign default values in destructuring?
A). let { a, b } = { a: 1 };
B). let { a = 1, b = 2 } = {};
C). let [a, b] = [1, 2];
D). let { a, b } = { a: 1, b: 2 };