JavaScript MCQ -1

JavaScript Quiz

1: What is the correct way to declare a variable in JavaScript?

a) var x = 10;
b) variable x = 10;
c) let x = 10;

2: What is the result of the expression "2" + 2 in JavaScript?

a) "22"
b) 4
c) 22

3: How do you write a comment in JavaScript?

a) // This is a comment
b)
c) /* This is a comment */

4: Which function is used to parse a string to an integer in JavaScript?

a) parseInt()
b) parseInteger()
c) toInteger()

5: What is the purpose of the JavaScript function "addEventListener"?

a) To add a new element to the document.
b) To attach an event handler to an element.
c) To create a new event in the DOM.

6: What does the JavaScript method "charAt()" return?

a) The character at a specific index in a string.
b) The character code of a specified character.
c) The position of a specified character in a string.

7: What is the purpose of the JavaScript "splice()" method?

a) To add elements to an array.
b) To remove elements from an array.
c) To sort the elements of an array.

8: What is the purpose of the "typeof" operator in JavaScript?

a) To check the type of a variable.
b) To create a new variable.
c) To perform type conversion.

9: What is the purpose of the JavaScript "map()" method for arrays?

a) To iterate over array elements and modify them.
b) To create a new array with the results of a provided function on each element.
c) To filter out elements based on a condition.

10: In JavaScript, what is the purpose of the "JSON.stringify()" method?

a) To parse a JSON string into an object.
b) To convert a JavaScript object into a JSON string.
c) To check if a variable is of JSON type.

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