My favorite Hotwire demo is the classic “inline create” on an index page. The form sits at the top of the page. When submitted, the create action returns turbo streams that (1) prepend the new item into the list and (2) replace the form with a fresh,

Query objects encapsulate complex database queries in reusable, testable classes. I use query objects when scopes become too complex or require parameters. Query objects compose smaller scopes, handle conditionals, and apply filtering logic. They're i

Data import/export moves data between systems. I use COPY for bulk operations—orders of magnitude faster than INSERT. CSV format balances simplicity and performance. Binary format is faster but less portable. Streaming import handles large files witho

Unnecessary re-renders hurt performance, especially with expensive computations or callbacks passed to child components. useMemo memoizes computed values, recalculating only when dependencies change. useCallback memoizes function instances, preventing

Macros dynamically add methods to Laravel's macroable classes—Request, Response, Collection, Query Builder, and more. I define macros in service providers' boot() methods. The macro() method accepts a name and closure. Macros access $this context like

Counter caches drift (deleted records, backfills, manual SQL). A repair job that recomputes counts safely is invaluable. It’s the kind of operational code you’re glad you wrote the first time a dashboard is wrong.

Turbo Streams enable surgical DOM updates from the server without writing JavaScript. After a successful form submission, instead of redirecting, I return a Turbo Stream response that appends, prepends, replaces, or removes specific elements. This is

Instruments profiles iOS apps to identify performance bottlenecks, memory leaks, and energy issues. The Time Profiler instrument samples the call stack to show which functions consume CPU time. Allocations tracks memory usage and finds leaks by identi

Transactions ensure that multiple database operations either all succeed or all fail together, preventing partial updates that leave data in inconsistent states. Rails provides ActiveRecord::Base.transaction which wraps a block of code in a database t

Sometimes you want only part of the screen to navigate—like a sidebar list updating the main content. Turbo Frames can do this cleanly: render the sidebar normally, and make its links target a turbo_frame_tag called main. Clicking a link swaps the mai

The Intersection Observer API efficiently detects when elements enter/exit the viewport, enabling lazy loading, infinite scroll, and analytics without expensive scroll listeners. I create observers with thresholds defining when callbacks trigger—0.0 m

Without a centralized error handler, you end up with a mix of thrown errors, ad-hoc res.status(500) blocks, and inconsistent JSON shapes. I use one Express error middleware that maps known errors to stable codes and logs unknown errors with request co