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JavaScript

Once relegated to the browser as one of the 3 core technologies of the web, JavaScript can now be found almost anywhere you find code. JavaScript developers move fast and push software development forward; they can be as opinionated as the frameworks they use, so let's keep it clean here and make it a place to learn from each other!

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Backtesting AMM Liquidity Strategies with amm-strategy-backtester

Backtesting AMM Liquidity Strategies with amm-strategy-backtester

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7 min read
Build an Industrial Heater Current Calculator with JavaScript

Build an Industrial Heater Current Calculator with JavaScript

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8 min read
Industrial Heater Sizing Calculator with JavaScript

Industrial Heater Sizing Calculator with JavaScript

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6 min read
Detect Industrial Heater Failures with JavaScript: A Rule-Based Anomaly Detection System

Detect Industrial Heater Failures with JavaScript: A Rule-Based Anomaly Detection System

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15 min read
We Built Guardrails Against JSON Precision Loss. Then We Found Out Half of Them Weren't Actually Guarding Anything.

We Built Guardrails Against JSON Precision Loss. Then We Found Out Half of Them Weren't Actually Guarding Anything.

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4 min read
I built 38 free browser-only tools that never upload your files

I built 38 free browser-only tools that never upload your files

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2 min read
Compute portfolio risk metrics (Sharpe, beta, correlation) via a free API - in JS and Python

Compute portfolio risk metrics (Sharpe, beta, correlation) via a free API - in JS and Python

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4 min read
Your cron expression can be valid and still never run

Your cron expression can be valid and still never run

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4 min read
4 JavaScript Things I Learned Recently

4 JavaScript Things I Learned Recently

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1 min read
"I built a Python compiler that runs in browser using WebAssembly"

"I built a Python compiler that runs in browser using WebAssembly"

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1 min read
Fifty Green Tests, Two Real Bugs, and the Oracle One `npm install` Away

Fifty Green Tests, Two Real Bugs, and the Oracle One `npm install` Away

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9 min read
Merge PDFs in the browser with JavaScript (no uploads, no server)

Merge PDFs in the browser with JavaScript (no uploads, no server)

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2 min read
Half my test suite asserts that nothing happened

Half my test suite asserts that nothing happened

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6 min read
A Michigan CDL study app that shows its work

A Michigan CDL study app that shows its work

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4 min read
Using Playwright projects and Page extensions to run tests on multiple testing environments

Using Playwright projects and Page extensions to run tests on multiple testing environments

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19 min read
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