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Cracking JavaScript: My Notes from LeetCode’s 30-Day Challenge
- The article compiles notes from working on LeetCode's 30 Days of JavaScript exercises, covering fundamental JavaScript concepts like closures, data encapsulation, immutability, high-order functions, function composition, and recursion.
- JavaScript closures allow functions to retain access to their lexical scope, even when executed in a different scope, providing benefits such as data encapsulation and avoiding global variables.
- The performance difference between the forEach method and the for loop lies in abstraction and readability versus direct access to array elements. forEach offers cleaner code but with a performance cost due to callback invocation.
- Functional programming concepts like pure functions, immutability, high-order functions, function composition, and declarative programming are explained, showcasing best practices and examples for each.
- Memoization, using caching to store function results for performance improvement, is discussed. An example with a memoized Fibonacci function demonstrates the efficiency gained through this technique.
- Promises in JavaScript, including Promise.all() to handle multiple promises concurrently, common interview questions on setTimeout and clearTimeout, and the Event Loop and Task Queue mechanisms, are explained to deepen understanding of asynchronous operations.
- Debounce, a technique to limit function executions and optimize performance, is explored along with its common use cases and implementation.
- The article aims to provide a comprehensive understanding of JavaScript concepts through practical examples, making it a valuable resource for interview preparation and enhancing JavaScript skills.
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