Coding Help Tips Resources Tutorials
Google Apps Scripts and Web Development Tutorials and Resources by Laurence Svekis
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
JavaScript is a powerful and versatile language essential for modern web development. Here are 10 essential coding exercises designed to enhance your JavaScript skills. Each exercise includes complete code and explanations to help you understand the concepts and improve your coding abilities. Exercise 1: Reversing a String Objective: Write a function to reverse a string. … Read more
JavaScript is a versatile and powerful programming language that underpins modern web development. As you advance in your JavaScript journey, tackling more complex and sophisticated exercises can significantly enhance your skills. Here are 10 advanced JavaScript coding exercises designed to challenge your understanding and help you master the language. Each exercise comes with complete code … Read more
When running JavaScript code, encountering an “Uncaught ReferenceError” can be frustrating. This error usually means that you’re trying to use a function or variable that hasn’t been defined. In this post, we’ll address the specific error “Uncaught ReferenceError: readLine is not defined” and provide a solution to fix it. The Problem HTML and JavaScript code … Read more
Debugging and troubleshooting are crucial for JavaScript developers to identify and fix code issues. This blog post covers techniques using console.log(), browser developer tools, breakpoints, the debugger statement, and try…catch blocks. Understanding these methods helps improve code quality and user experience by resolving common syntax, runtime, and logical errors.