#JavaScript #CodingInterview #100DaysOfCode
Writing functional code is not enough; your code must also be efficient. Debouncing vs. Throttling
Its value depends on how the function is called (e.g., in a method, a regular function, or as a constructor).
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Are you preparing for a JavaScript interview and looking for a comprehensive resource to help you crack it? Look no further than Happy Rawat's JavaScript interview questions PDF! Happy Rawat is a well-known figure in the programming community, and his resources are highly sought after by aspiring programmers. In this write-up, we'll explore the best JavaScript interview questions PDF available for free, courtesy of Happy Rawat.
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The this keyword in JavaScript confuses many developers because its value is determined by how a function is called, not where it is defined. To control the context of this , we use explicit function binding. Description Syntax / Argument Format Immediate Execution? Invokes the function with a specific this context. Accepts arguments individually, separated by commas. Yes apply Invokes the function with a specific this context. Accepts arguments as a single array. Yes bind Returns a brand-new function with a bound this context. Accepts arguments individually. No (Can be executed later) Code Example javascript Your public links are automatically deleted after 13 months
: Stores callbacks from Promises and MutationObserver . Micro-tasks have higher priority than macro-tasks. Promises vs. Async/Await
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Understanding when to use specific optimization techniques shows senior-level engineering maturity. Best Use Cases Delays execution until a period of inactivity passes. Search bar auto-suggestions, form validation. Throttling Guarantees execution at a regular, fixed interval. Infinite scroll loading, window resizing, game loops. Memory Management and Avoiding Leaks Are you preparing for a JavaScript interview and
Happy Rawat is a well-known instructor who provides extensive JavaScript interview preparation materials, primarily through his YouTube channel (Programming with Happy Rawat) and specialized Udemy courses . His resources are highly regarded for their structured approach, often categorized into beginner, intermediate, and advanced levels to help developers crack technical rounds. Key Resources by Happy Rawat
: Approximately 50 questions in his masterclass focus on real-world coding scenarios and output-based problems. Where to Find "Best Free" Content
function createCounter() let count = 0; // Private variable return increment: function() count++; return count; , decrement: function() count--; return count; ; const counter = createCounter(); console.log(counter.increment()); // 1 console.log(counter.increment()); // 2 // count is completely inaccessible from the global scope Use code with caution. Master the this Keyword: call() , apply() , and bind()
Introduced in ES6. Variables declared with let and const stay inside the curly braces {} where they are defined.