Blog — Developer Tips & Productivity Insights
Tips, guides, and deep dives on text processing, coding conventions, and human performance.
Unicode Fancy Fonts on Instagram: How They Work and When Not to Use Them
Bold, italic, and script "fonts" in Instagram bios are not fonts at all — they are Unicode characters. Here is how they work, where they break, and why screen readers cannot read them.
10 Invisible Characters That Silently Break Copy-Paste
Zero-width spaces, BOM, and NBSP silently break string equality, JSON parsers, and trim(). 10 hidden Unicode characters with code examples and a one-click fix.
Why camelCase vs snake_case Matters in Code
Naming conventions affect readability, tooling, and team velocity. A practical guide to choosing the right case style for your project.
Average Reaction Time by Age: What's Normal?
Reaction time varies by age, sleep, and practice. See the benchmarks, learn what affects your speed, and test yourself.
Top 5 JSON Errors and How to Find Them Fast
Trailing commas, missing quotes, wrong encoding — the most common JSON mistakes that break APIs and configs. Learn how to spot and fix them instantly.
How to Measure Reaction Time Accurately
Three methods to measure reaction time — ruler drop, online tests, and lab experiments. Pros, cons, and tips for getting accurate results.
Why Counting Characters Matters: Twitter, SEO & SMS Limits
Character limits are everywhere — social media posts, meta titles, SMS messages, database fields. Learn the exact limits and how to stay within them.
Reaction Time vs Reflex: What Is the Difference?
Reaction time and reflexes are not the same thing. Learn the neuroscience behind each, see real-world examples, and find out which one you can actually train.
Why Your Character Count Differs Between Apps (and Which One Is Right)
Twitter, SMS, and Python all count characters differently. The same text shows as 10 in one app and 12 in another. Here is exactly why.
Most Frequent English Words List: 50 Words, COCA Frequency Data
The 50 most frequent English words ranked by COCA frequency (per million words). Covers Zipf's law, function vs content words, and NLP stop-word tips.
7 Whitespace Bugs That Break Production Deploys
Trailing spaces in YAML, Windows CRLF line endings in bash scripts, BOM markers — real whitespace mistakes that trigger production failures and take hours to debug.
CSS Color Conversions: HEX, RGB, HSL — Cheatsheet and When to Use Each
Everything you need to convert CSS colors between HEX, RGB, and HSL formats. Includes hand-calculation formulas, JavaScript code, and when each format is the right choice.
UUID v4 vs v7: When to Use Each (and Why It Affects Database Performance)
UUID v4 is random and fragments database indexes. UUID v7 is time-ordered and sorts naturally. When to use each, with collision math and migration advice.
How to Extract Webpage Text to Markdown (Without Ads or Clutter)
Plain copy-paste loses headings, lists, and links. Here is how to convert any webpage to clean Markdown with one click — ready for ChatGPT, Claude, Obsidian, or Notion.
Go/No-Go Test Explained: What It Measures and Why to Train It
The Go/No-Go task measures response inhibition — the ability to stop an automatic action. How it works, what commission and omission errors mean, age norms, and ADHD research.
Base64 33% Size Overhead Explained: RFC 4648 Formula & When It Matters
Base64 maps 3 bytes → 4 chars (4/3 ratio per RFC 4648), adding 33% to every payload. See the size formula, padding rules, and when to skip Base64 entirely.
Percent-Encoding Cheatsheet: encodeURI vs encodeURIComponent and Double-Encoding Bugs
encodeURI and encodeURIComponent escape different characters, and choosing the wrong one breaks query strings. RFC 3986 rules with real examples.
Unix Timestamp Pitfalls: Y2038, Milliseconds vs Seconds, and Timezone Hell
Unix timestamps look simple — seconds since 1970 UTC — until Y2038 overflow, milliseconds-vs-seconds mismatch, and timezone bugs corrupt your data.
How Diff Algorithms Work: Myers, Patience, Histogram — Why git diff Sometimes Looks Wrong
Diff is not one algorithm but a family. Myers, patience, and histogram each give different output for the same files. How and when each one wins.
Choice Reaction Time and Hick's Law: Why More Options = Slower Decisions
Choice reaction time grows logarithmically with the number of options — Hick's Law. The cognitive cost of choice, with norms, esports data, and the Stroop wrinkle.
Audio vs Visual Reaction Time: Why Sound Is 30-50 ms Faster Than Light
Audio reaction time beats visual by ~30-50 ms because sound reaches the cortex through fewer synapses. The neuroscience, sports examples, and measurement caveats.
How to Measure Noise Level in an Office: A Practical Guide
A practical, standards-based guide to measuring office noise: OSHA and WHO limits, microphone placement, A-weighting vs C-weighting, and the real limits of browser-based meters.