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Latest Articles

What Is an SLO? Why SLOs Matter for Software Teams

Learn what SLOs, or service-level objectives, are and why they matter in software reliability engineering. This article explains the differences between SLI, SLO, and SLA, and why teams should use percentiles such as P50, P95, and P99 instead of relying only on averages when measuring reliability.

What Is Latency, and Why Does It Matter?

Latency is the waiting time between an event happening and its result becoming visible, and it is one of the most important non-functional requirements in system design. This article explains why low latency matters through user experience, real-time systems, software efficiency, and the tradeoff between latency and throughput.

DDIA Chapter 5 Guide — Encoding and Evolution, Part 1

This guide covers the first half of Chapter 5 of Designing Data-Intensive Applications, explaining why data must be encoded once it leaves process memory and how formats such as JSON, XML, and Protocol Buffers differ. It also introduces forward and backward compatibility, and why schema evolution matters for long-lived systems.

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.