Google Analytics should run only in production to avoid polluting visitor statistics. Rails environment checks can gate the tracking snippet.

Coffeescript loop variables can leak into later callbacks, causing repeated values; do and IIFEs create a fresh scope for each iteration.

AngularJS strips Content-Type from blank-body GET and DELETE requests, which can break APIs that require it. Decorating $httpBackend can restore the header selectively.

External redirects are awkward to test with Cucumber and Capybara: Rack::Test ignores the host, while Selenium follows it. Controller specs or an observable redirect make the target URL verifiable.

CoffeeScript can accidentally return DOM nodes from Angular click handlers, triggering the “Referencing DOM nodes in Angular expressions is disallowed” error. An explicit return value avoids leaking a node into Angular.

Browser password managers ignore autocomplete=off on login forms, and disabling autocomplete weakens passwords. Hidden fields can stop saving, but not improve security.

Keep table headings visible while scrolling large tables by cloning the header and syncing widths and horizontal position with jQuery.

Testing web apps at mobile-like sizes or with a custom browser identity reveals layout and behavior bugs before release.

fake_stripe runs a local Stripe-like server and fake Stripe.js for feature specs, letting purchase flows be tested without external HTTP requests or Stripe sandbox flakiness.

AngularJS service kinds differ in configurability, injection style, and object shape; factories are usually the default choice, while providers support configuration and decorators extend existing services.

Free Bootstrap theme with a Material Design look for Rails apps. Sass and Less files simplify integration, while the CSS-only approach keeps the theme easy to replace.

Safer browser console logging makes debugging easier: %o interpolation keeps values readable, and object shorthand lets structured data expand interactively.

PIE may fail to redraw nested elements when a parent class changes, leaving updated styles stale; changing the target element’s own CSS or markup works around it.

IE lacks object-fit support, but lazysizes can polyfill image and video fitting with contain or cover behavior.

Migrating a Rails app from yarn to npm can reduce dependency complexity and avoids upgrading to Yarn 2.0. Matching package versions helps keep installs stable.

Closing a Selenium pop-up requires switching to its window handle and then pointing the driver back to another tab to avoid broken subsequent steps.

jQuery-free dropdown components for advanced selects are needed when Select2 is too dependent on jQuery or missing features.

Responsive layouts can switch styles when content wraps onto multiple lines or stays on one line, enabling different treatment for narrow screens.

Read the jQuery version from $.fn.jquery to check which library release is loaded at runtime.

React.js uses a virtual DOM to re-render only changed parts, making full-screen updates fast enough that subviews and MVC separation may be unnecessary.