Quiz

JavaScript is a dynamic and powerful language that is essential for web development. Here are 50 more multiple-choice questions with detailed explanations to help you further enhance your knowledge and skills. Question 1 What will the following code output? console.log([] == []); A) trueB) falseC) undefinedD) Error Answer: B) false Explanation: In JavaScript, two array … Read more

Question 1 What will be the output of the following code? console.log(typeof null); A) “null”B) “undefined”C) “object”D) “number” Answer: C) “object” Explanation: In JavaScript, typeof null returns “object”. This is a well-known bug in JavaScript that exists for legacy reasons. Question 2 What is the output of the following code? console.log(0 == ‘0’); A) trueB) … Read more

Question 11 What will the following code output? console.log(1 + “2” + “2”); a) 5b) “32”c) “122”d) NaN Answer: c) “122” Explanation: When adding a number to a string, JavaScript performs string concatenation. 1 + “2” results in “12”, and then “12” + “2” results in “122”. Question 12 What is the output of the … Read more

Question 1 What is the output of the following code? console.log(typeof NaN); a) “number”b) “string”c) “undefined”d) “NaN” Answer: a) “number” Explanation: In JavaScript, NaN (Not-a-Number) is actually of the type number. This is a special value that results from operations that don’t yield a valid number. Question 2 What does the following code snippet do? … Read more