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System Design Interview Questions

This series compiles common System Design interview questions

[Easy] LeetCode JS 30 - 2724. Sort By

This article explains how to sort an array in JavaScript according to a custom function. You'll learn how to achieve this using the built-in sort method with a comparator function. The article provides clear explanations and examples to help you understand the logic behind custom array sorting.

[Easy] LeetCode JS 30 - 2619. Array Prototype Last

Learn how to enhance arrays in JavaScript by adding a custom method called .last() that returns the last element of the array. This tutorial explains JavaScript's prototype mechanism and demonstrates how to modify the prototype to extend the functionality of all arrays. Enhance your JavaScript skills now!

Feature Articles

[Medium] LeetCode JS 30 - 2625. Flatten Deeply Nested Array

Learn how to flatten deeply nested arrays in JavaScript without using the built-in Array.flat method. This tutorial introduces a recursive approach to flattening multi-dimensional arrays to a specified depth. Enhance your JavaScript skills with this comprehensive guide!

How to remove duplicates from an array?

Learn multiple solutions to remove duplicates from an array efficiently in JavaScript. This tutorial covers four methods: using Set, filter with indexOf, nested for loop, and utilizing Object or Map. Enhance your JavaScript skills and be well-prepared for array manipulation challenges in interviews and real-world scenarios.

The Most Common JavaScript Event Loop Interview Questions

The event loop is a common question in interviews. In addition to knowing the concept, You also need to know how it works in code. Here we have listed common JavaScript event loop code interpretation questions

What is the CSS Box Model?

When the browser engine lays out the document, it will treat each element as a rectangular Box according to the Box Model of CSS. This Box is composed of content, padding, border and margin.