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Languages & runtimes · #javascript
Jasmine spies let you stub dependencies and verify interactions without real implementations — but overusing toHaveBeenCalledWith makes tests brittle. Here's how to spy well.
Discover how to use Lodash’s _.memoize with custom resolvers for complex inputs, understand memory and stale‑data trade‑offs, and validate the cache in a Node.js environment. Follow a step‑by‑step example and practical checklist.
Babel’s useBuiltIns option in @babel/preset‑env lets you auto‑inject polyfills only for the features you actually use. This reduces bundle size, speeds up load times, and keeps your codebase lean. Learn how to configure it, see a concrete example, and understand the trade‑offs.
Large Swiper carousels stall because every slide mounts at once. Virtual slides fix that but conflict with loop mode — here's how to choose, configure, and verify the right strategy.
Decide where to drop Sentry events — SDK sampling, beforeSend, ignoreErrors, or server-side filters — with a comparison table, trade-offs, and a validated Node/browser config example.
Learn how Rollup analyzes ES module graphs to drop unused exports, see a minimal configuration example, and understand the limits and common pitfalls that affect tree-shaking effectiveness.
A decision guide comparing Postman Pre-request Scripts and Tests tabs, covering constraints, trade-offs, and a concrete implementation for dynamic API validation.
Two global-mode p5.js sketches share one window.setup — and one silently wins. Instance mode gives each sketch its own scope for the price of a p. prefix.
An architecture note on keeping a Grunt build correct: minimal config-driven Gruntfile design, plugin and glob trust boundaries, operational checks, and when to move off Grunt.
jasmine
lodash
swiper
rollup
p5js
grunt