Dan Levy

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Code

Found 17 articles

Give Your Agent a Profiler

Benchmarks say whether. Profiles say where. Agents guess the rest.

Three linked inspection lenses reveal a paper website's visual layout, orange profiling strips, and green keyboard-focus outlines.12 min readCategory Code

Postgres Text Searching Guide 2026

The search tools already in your database, and when each one earns its keep.

A woodcut alpine landscape combines layered mountain strata, similar marked stones and one square vermilion stone at the end of a red path.9 min readCategory Code

Semantic Vector Search and Other Topics to Win Friends and Lovers

The full search landscape: exact, fuzzy, semantic, hybrid — and when to layer all of them.

A fern, an aubergine leaf, and a yellow ginkgo fan share one branching stem across torn moss, lemon, and plum paper; a striped triangular scrap sits apart.14 min readCategory Code

Foreign Keys: Stop Asking If They're Fast

Ask what you're actually optimizing for.

A russet bicycle's rear wheel is supported by two small stabilizer wheels on weathered pavement in warm outdoor light.8 min readCategory Code

Stop Leaking Memory with WeakMap

Fixing weak code with weak references!

Indigo paper leaves and their attached red tags progressively disappear into matching fragments.4 min readCategory Code

JSONB: The Best Way to Ruin Your Database

JSONB is powerful, useful, and very easy to misuse when you let a blob become your real schema.

A crimson envelope bulges with mismatched torn paper shapes and trailing threads on a blush field.6 min readCategory Code

Your Timestamp is a Lie

What a train ticket taught me about storing time in databases

Your Timestamp is a Lie7 min readCategory Code

Async Stack Traces: Why `Error.stack` Lies to You

The microtask queue ate my homework (and my debugging context).

A red thread connects black printed shoe soles across a torn blank gap where historical footsteps are missing.2 min readCategory Code

Beware the Single-Purpose People

So pure it hurts

An explorer peers downward through a long telescope at one tiny stone while disconnected paths and an expansive misty mountain valley surround them.6 min readCategory Code

Using Environment Variables in NodeJS

Using dotenv

Using Environment Variables in NodeJS2 min readCategory Code

Broken Promises?

Dropping errors, losing results...

Broken Promises?3 min readCategory Code

Promise Gotchas

Avoiding common mistakes

Promise Gotchas1 min readCategory Code

Intro to Promises

JavaScript Promises Are Fun!

Intro to Promises2 min readCategory Code

Pitfalls in Promise Docs

Avoiding issues from popular docs

Pitfalls in Promise Docs2 min readCategory Code

Higher Order Programming

Exploring Array- and Set-based Pipeline Techniques

Higher Order Programming1 min readCategory Code

AngularJS Tricks

AngularJS CAN BE Fun!

AngularJS Tricks3 min readCategory Code

Best Free UI Design Resources for Developers

A curated 2026 list of UI kits, Tailwind blocks, icons, fonts, illustrations, animations, and design tools for building polished websites faster.

Best Free UI Design Resources for Developers6 min readCategory Code