Do not write code immediately. Ask about edge cases, input types, and expected error handling.
Currying transforms a function that takes multiple arguments into a sequence of functions that each take a single argument. It can be implemented using closures or bind . javascript
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function myPromiseAll(promises) return new Promise((resolve, reject) => let results = []; let completed = 0; if (promises.length === 0) resolve(results); return; promises.forEach((promise, index) => Promise.resolve(promise) .then((value) => results[index] = value; completed++; if (completed === promises.length) resolve(results); ) .catch((error) => reject(error); ); ); ); Use code with caution. 4. Advanced Coding Patterns & Machine Coding
Memoization optimization caches the results of expensive function calls and returns the cached result when the same inputs occur again. javascript
Happy Rawat is an educator and content creator known for simplifying complex programming concepts. He is active on platforms like YouTube and has published various educational materials tailored specifically for the Indian tech education market (B.Tech/MCA students). His materials are designed to bridge the gap between academic theory and industry expectations. Do not write code immediately
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Mastering Your Frontend Interview: The Ultimate Happy Rawat JavaScript Interview Guide
Here are standard technical questions frequently found in updated JavaScript interview compilations, complete with clear explanations. Q1: What is the difference between == and === ? It can be implemented using closures or bind
Stay current by demonstrating a deep comfort level with recent language additions.
Created when your script runs. It establishes the global object ( window in browsers) and the this keyword.
Array.prototype.myMap = function(callback) let result = []; for (let i = 0; i < this.length; i++) // Only process initialized indices to handle sparse arrays if (i in this) result.push(callback(this[i], i, this)); return result; ; Use code with caution. 2. Polyfill for Array.prototype.filter
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