Quiz - JavaScript Control Structures and Functions Quiz

Question 1

What does the following code return? function add(a, b) { return a + b; } add(5, 10);

15 10 15 5

Question 2

What will be the value of "y" after the following code? let y; if (true) { let y = 5; } console.log(y);

undefined 5 0 NaN

Question 3

What will the following code output? console.log(2 === "2");

false true undefined NaN

Question 4

Which loop will always execute at least once?

do...while for while foreach

Question 5

Which of the following is a higher-order function?

map() filter() reduce() forEach()

Question 6

Which of the following statements is used to stop a loop?

break continue return stop

Question 7

What does the "break" statement do in a switch case?

Exits the switch case Continues to the next case Throws an error Returns a value

Question 8

How are function expressions different from function declarations?

Function expressions are not hoisted, function declarations are hoisted Function expressions are hoisted, function declarations are not Both are hoisted Neither are hoisted

Question 9

What keyword is used to define a function in JavaScript?

function define func method

Question 10

What is the output of the following code? let x = 10; if (x > 5) { var x = 20; } console.log(x);

20 10 undefined error