Quiz - JavaScript Control Structures and Functions Quiz | Lancecourse

JavaScript Control Structures and Functions Quiz

Test your knowledge of control structures and functions in JavaScript.

Question 1 What is the output of the following code? let x = 10; if (x > 5) { var x = 20; } console.log(x);: 20 10 undefined error

Question 2 What will the following code output? console.log(2 === "2");: false true undefined NaN

Question 3 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 4 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 5 Which of the following statements is used to stop a loop?: break continue return stop

Question 6 Which of the following is a higher-order function?: map() filter() reduce() forEach()

Question 7 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 8 What keyword is used to define a function in JavaScript?: function define func method

Question 9 Which loop will always execute at least once?: do...while for while foreach

Question 10 What does the following code return? function add(a, b) { return a + b; } add(5, 10);: 15 10 15 5

Answer all the questions then submit.