trunpjack.hashnode.devThe Math Behind a Gold Value Calculator: Purity, Weight Units, and Data StructuresBuilding a gold value calculator seems simple at first—weight × price × purity. But once you dig in, you run into a few domain details that can trip you up. Here's what I learned while building one. Karat vs. Pure Gold Gold purity is measured in kara...Feb 13·2 min read
trunpjack.hashnode.devA Free Chronological Age Calculator for Forms and Reports — Why Single-Purpose Tools Still MatterIf you've ever had to fill in chronological age at date of testing on a form—assessment, IEP, or clinical report—you know the drill: count months and days from birth to test date, watch for leap years, double-check. One wrong month and the whole thin...Feb 10·2 min read
trunpjack.hashnode.devHow Built a Free Image Cropper Without Backend: A Client-Side Architecture Case StudyAs a developer who recently built SquareImage, I want to share how we achieved a fully functional image editor without any backend infrastructure - all processing happens directly in the browser. Technical Architecture Breakdown: Pure Client-Side Pr...Jan 15·2 min read