Are you involved in creating large websites and using HTML5, CSS, and JS? Then take some time and spare 5 minutes to attempt this JavaScript quiz. It includes 25 questions that would test your end-to-end knowledge of JavaScript.
JavaScript is the most famous, dynamic, and untyped client-side scripting language. While coding, you don’t have to declare the type for variables and methods. It supports object-oriented and functional programming models and has built-in support for strings, arrays, dates, and regular expressions.
Checkout: 20 JavaScript Coding Tips
With the help of JS and CSS, you can create responsive designs that improve the user experience and add dynamic behavior like displaying pages without waiting for the server.
In addition to the skills mentioned, building a remarkable web page also requires the knowledge of HTML5. So you may not want to miss out on our latest HTML CSS quiz.
This quiz covers many JavaScript questions that will help a web developer check his knowledge of the language features. The rest of the quiz contains coding snippets to evaluate your programming ability.
JavaScript Quiz – 25 Questions
Answer Key with Reasoning
Here’s a concise reasoning table explaining the correct answers for all 25 JavaScript questions:
| Q# | Correct Answer | Reasoning |
|---|---|---|
| 1 | 7 | The value of a is updated to 7 inside the if block. |
| 2 | 5 | var variables are function-scoped, so a is accessible inside alert(). |
| 3 | 6 | The function update() changes the global variable a to 6. |
| 4 | 3 | window.a = 3 makes a a global variable accessible in second(). |
| 5 | 'string' | typeof x returns a string, and typeof typeof x results in "string". |
| 6 | 8; 7; 6 | 8 (inner function), 7 (middle scope), 6 (global). |
| 7 | 12 | getFunc() returns a function that adds 7 + 5. |
| 8 | Both | typeof is a unary operator that returns a string representation of a variable’s type. |
| 9 | True | JavaScript allows passing anonymous functions as arguments. |
| 10 | Both | A callback is a function passed as an argument to another function. |
| 11 | var obj = new Object(); | This is the correct way to create an object using the Object constructor. |
| 12 | toString() | Converts Boolean values (true/false) to string format. |
| 13 | replace() | This method replaces specified substrings in a string. |
| 14 | big() | This method makes text larger in HTML. |
| 15 | concat() | Returns a new array by merging two or more arrays. |
| 16 | forEach() | Iterates over an array and executes a function for each element. |
| 17 | splice() | Modifies the array by adding/removing elements. |
| 18 | All | JavaScript is lightweight, network-centric, and integrates with Java. |
| 19 | Using typeof | typeof checks the type of a variable or value. |
| 20 | pop() | Removes and returns the last element of an array. |
| 21 | toExponential() | Converts numbers to exponential notation. |
| 22 | toLocaleString() | Formats numbers based on the locale settings. |
| 23 | match() | Matches a string against a regular expression and returns results. |
| 24 | toLocaleUpperCase() | Converts text to uppercase while respecting locale settings. |
| 25 | link() | Creates a hyperlink using the link() method. |
Key Takeaways from JavaScript Quiz
So, did you enjoy the quiz? We hope you liked the different questions related to the JavaScript concept. We want to thank you for taking the time to try this quiz.
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Also Read: Latest JavaScript Interview Questions and Answers
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