Postgres uses B-Tree indexes by default, but other index types can perform better for specialized lookup patterns and data distributions.

Spreewald Cucumber steps can verify that e-mails were sent with arbitrary conditions, useful for testing mail dispatch logic.

Client-side cookies in JavaScript can be read and written through document.cookie, but values must be parsed and path and expiry must be set carefully.

A dedicated shell for Git workflows reduces repetitive typing and keeps command entry focused. git config --global help.autocorrect true helps absorb accidental git prefixes inside gitsh.

Read and write deeply nested object values without manual path checks; NestedHash recursively traverses keys and creates missing levels.

Disk space usage in MySQL or MariaDB can be measured per table and per column with simple information_schema and char_length queries.

Command-line syntax is hard to read; explainshell breaks commands into parts and explains each option using parsed man pages.

Removing local or remote Git branches prevents stale feature lines and clears finished work. git branch -d and git push origin --delete handle the common cases.

Short links can reveal their destination and redirect chain before you click them by adding + to the end; public stats and profile exposure can leak traffic information.

Modern JavaScript APIs often return iterators, and CoffeeScript cannot use for...of for them. while with iterator.next() is needed to read iterable values.

Binary file uploads need FormData so AJAX can send multipart payloads from file inputs without manual serialization; older browsers often need a plain form fallback.

Fuzzy string matching can be slow or inaccurate with LIKE and full text search. Trigram indexes offer a lighter approach for partial search and typo tolerance.

Inspecting the generated Ruby for erb or haml templates helps debug rendering issues and understand what Rails executes. lookup_context.find_template and the template handler return the compiled output code.

Fast Ruby profiling by sampling stack traces at intervals, suitable for production and CPU-focused performance analysis with raw dump inspection.

Routing error in Rails 3.2.22.1 can appear when concerns is passed as an option to resources, producing broken routes and failed controller specs.

Chrome no longer supports 32-bit Linux builds, which can break apt-get update with a repository Release fetch error. Updating the APT source to amd64 avoids the failure.

return 444 makes nginx close a connection without sending a response, useful for rejecting specific routes or simulating dropped requests behind a reverse proxy.

Finding a matching text node in nested DOM trees is tricky because broad text queries return ancestor elements too. Selecting the deepest element avoids false matches in Capybara, XPath, and jQuery.

Reversing element order with CSS helps make inline lists stack in a different visual order on small screens without changing the markup.

Count network connections by remote IP and sort them to spot hosts with many open or lingering sessions. Works on FreeBSD and Linux using netstat and shell tools.

Chrome extension for inspecting Google Analytics tracking in complex setups. Opens in the developer console and stays lighter than broader tag-assistance tools.

Cross-platform filesystem metrics are awkward to gather in Ruby; sys-filesystem uses FFI to provide them without parsing df output.

RSpec one-liners can assert expectations on subject with implicit example descriptions, using should or is_expected in expect-based syntax.