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Google Apps Scripts and Web Development Tutorials and Resources by Laurence Svekis
When working with JavaScript objects, you may encounter situations where you need to create an exact copy of an object. However, simply copying an object with assignment (=) or even using methods like Object.assign() creates a shallow copy. This means that nested objects or arrays within the original object will still reference the same memory … Read more
When working with web applications, it’s crucial to manage user interactions effectively, especially when dealing with asynchronous operations like AJAX requests. One common issue is handling double clicks on buttons, which can lead to multiple, unnecessary requests. In this blog post, we’ll walk through a solution to prevent double clicks on a button that triggers … Read more
100 Advanced JavaScript Multiple Choice Questions with Answers and Explanations JavaScript is a versatile and powerful language used widely for web development. To truly master JavaScript, especially its advanced concepts, it’s essential to understand not just the syntax but the underlying principles and behaviors of the language. Below are 100 advanced multiple-choice questions designed to … Read more
Preparing for a JavaScript coding interview can be daunting, but with the right strategies and tips, you can set yourself up for success. Here are 100 tips to help you ace your next JavaScript interview: Before the Interview JavaScript Fundamentals Advanced JavaScript Concepts Performance and Optimization Testing and Debugging Front-End Frameworks and Libraries Node.js and … Read more
Fundamental Tips Best Practices Performance Tips Debugging Tips Advanced Techniques Code Quality Tools and Libraries Security Learning and Growth Miscellaneous By following these tips, JavaScript coders can improve their skills, write cleaner and more efficient code, and stay up-to-date with the latest developments in the language.
1. What is the output of the following code? console.log(typeof null); A) “object”B) “null”C) “undefined”D) “boolean” Answer: A) “object” 2. How can you create an immutable object in JavaScript? A) Object.freeze(obj)B) Object.seal(obj)C) Object.preventExtensions(obj)D) Object.immutable(obj) Answer: A) Object.freeze(obj) 3. What does the reduce method do? A) Iterates over an array and returns a new arrayB) Iterates … Read more
1. What is a closure in JavaScript? Explanation: A closure is a function that retains access to its outer scope’s variables even after the outer function has returned. This allows the inner function to maintain a reference to the variables in its enclosing scope. 2. How does JavaScript handle asynchronous operations? Explanation: JavaScript handles asynchronous … Read more
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
As you continue your journey in mastering JavaScript, tackling more complex and challenging exercises can significantly enhance your coding skills. Here are 10 advanced JavaScript exercises designed to push your understanding and help you become a more proficient developer. Each exercise includes complete code and explanations. Exercise 1: Implementing a Debounce Function Objective: Create a … Read more