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: Hoisted but placed in a "Temporal Dead Zone" (TDZ). Accessing them before declaration throws a ReferenceError .

Holds callbacks from setTimeout , setInterval , and DOM events.

A closure is the combination of a function bundled together with references to its surrounding state (the lexical environment). Closures allow an inner function to access the scope of an outer function even after the outer function has returned. javascript happy rawat javascript interview questions pdf free best

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function debounce(func, delay) let timer; return function(...args) clearTimeout(timer); timer = setTimeout(() => func.apply(this, args); , delay); ; Use code with caution. Prototypal Inheritance vs. ES6 Classes : Hoisted but placed in a "Temporal Dead Zone" (TDZ)

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Memory leaks in JavaScript and how to prevent them (e.g., forgotten timers, global variables). Currying and advanced function composition. Infinite currying implementation ( add(1)(2)(3)...() ). A closure is the combination of a function

function flattenArray(arr) let result = []; arr.forEach(item => if (Array.isArray(item)) result.push(...flattenArray(item)); // Recursive step else result.push(item); ); return result; console.log(flattenArray([1, [2, [3, 4], 5], 6])); // [1, 2, 3, 4, 5, 6] Use code with caution. Challenge 2: Implement a Polyfill for Array.prototype.map()