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Software Engineering

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From frontend, backend to system design, a complete collection of the most common interview questions

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Hundreds of questions with high-quality answers

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Software engineering learning resources and classic software engineering book summaries

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Fullstack development tutorial

Latest Articles

The Tradeoffs Between Stateful and Stateless Software Design

Stateful and stateless design is not about which one is universally better. It is about where state should live, who should manage it, and how that choice affects scalability, latency, performance, and failure modes.

Frontend System Design: Non-Functional Requirements for Feeds (Performance)

This article discusses performance requirements in frontend system design for feeds, and explains why non-functional requirements are what separate shallow designs from deeper ones. It focuses on rendering strategies and progressive loading, covering how SSR, hydration, streaming SSR, and skeleton loading improve perceived performance.

Frontend Performance Optimization: List Virtualization

This article explains how list virtualization reduces browser workload by rendering only the items near the visible viewport instead of the entire list. It also covers the core implementation model, how TanStack Virtual works, and when virtualization is worth the added complexity.

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.