Java Date Formatting Bug: YYYY vs yyyy Explained
In Java date formatting, uppercase YYYY represents the week-based year, while lowercase yyyy represents the calendar year. Using YYYY can cause dates in late December to print as the following calenda
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How Netflix Architecture Works: AWS & Open Connect CDN
Quick Answer: Netflix separates its control plane (AWS) from its data plane (Open Connect). Instead of streaming massive video files directly from AWS data centers, Netflix embeds custom hardware call
Why Git Stores File History Backwards
Quick Answer / TL;DR: Git optimizes repository performance by storing the newest version of your files whole while keeping older history as backward deltas. When running garbage collection, Git sorts
Why setTimeout Isn't in ECMAScript & How to Fix TS Types
Quick Answer: setTimeout is not defined in the ECMAScript (ECMA-262) language specification. It is a host-provided Web API implemented independently by environments like web browsers (via the HTML spe
How Hashcash Works: Proof of Work Before Bitcoin
Quick Answer: Hashcash, created by Adam Back in 1997, introduced Proof of Work to combat email spam by requiring senders to solve a computationally asymmetric puzzle. By forcing senders to compute a h
The $460M Feature Flag: Knight Capital Software Disaster
In 2012, Knight Capital lost $460 million in just 45 minutes due to an incomplete software deployment and dead code execution. Reusing an old feature flag across eight servers allowed an unverified le
Collections.unmodifiableList vs List.copyOf in Java
Quick Answer: Collections.unmodifiableList in Java creates a read-only view wrapper over an existing collection rather than an immutable copy. If the underlying collection mutates, those changes immed