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Block-scoped, meaning they only exist within the curly braces {} where they are defined. 2. The Concept of Hoisting

Writing polyfills demonstrates your deep understanding of native JavaScript methods. Here is how to implement a custom Promise.all : javascript

Memoization optimization caches the results of expensive function calls and returns the cached result when the same inputs occur again. javascript happy rawat javascript interview questions pdf free upd

What is a closure? Provide an example of its usage.

Mastering JavaScript is the cornerstone of landing a high-paying role in modern web development. To help you navigate the competitive landscape of technical rounds, we have compiled an extensive guide based on the popular "Happy Rawat JavaScript Interview Questions" series. Block-scoped, meaning they only exist within the curly

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// Infinite Currying Question: add(1)(2)(3)...() function add(a) return function(b) if (b !== undefined) return add(a + b); return a; ; console.log(add(2)(3)(4)()); // 9 Use code with caution. Memoization

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Code is executed line by line, assigning values to variables and invoking functions. 2. Closures and Lexical Scoping