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JavaScript Quiz Online Free - 01


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Question 1: Which of the following is not a valid JavaScript data type?

Question 2: What is the result of typeof NaN?

Question 3: Which keyword is used to declare a constant in JavaScript?

Question 4: What is the correct way to comment a single line in JavaScript?

Question 5: How do you declare a function in JavaScript?

Question 6: What does the === operator do in JavaScript?

Question 7: Which of the following is not a loop in JavaScript?

Question 8: What is the purpose of the "Array.push()" method in JavaScript?

Question 9: What is the output of 2 + "2" in JavaScript?

Question 10: Which method is used to remove the last element from an array in JavaScript?

Question 11: What does the "parseInt("3.14")"" function return in JavaScript?

Question 12: Which of the following is not a valid way to declare a variable in JavaScript?

Question 13: What is the purpose of the setTimeout() function in JavaScript

Question 14: How do you check the length of an array in JavaScript?

Question 15: Which operator is used to concatenate two strings in JavaScript?

Question 16: What is the result of "5" - 3 in JavaScript?

Question 17: What is the purpose of the Array.splice() method in JavaScript?

Question 18: Which of the following is not a valid way to declare an object in JavaScript?

Question 19: What is the correct way to check if a variable is an array in JavaScript?

Question 20: What does the Array.join() method do in JavaScript?

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