A lightweight JavaScript date library for parsing, manipulating, and formatting dates.

Run custom setup code before selected RSpec examples using metadata tags instead of Cucumber scenarios.

Invalid gemspecs and ill-formed requirements often come from the Syck-to-Psych transition; replacing Syck::DefaultKey entries with = in affected gemspec files resolves the error.

Selection highlight color can be customized with CSS using ::selection and ::-moz-selection; Firefox needs the vendor-specific pseudo-element.

REST Client adds application/xml to simple GET requests, which can trigger unexpected server responses. :accept => :html requests the default text/html content type instead.

Preview email in the browser instead of sending it, making message review and debugging easier during development.

Cucumber step definitions can map natural-language destinations to Rails route helpers, including list, new, edit, and record lookup paths.

High-level MV* JavaScript frameworks reduce DOM boilerplate with client-side rendering, routing, and data binding, but choosing between Backbone, Ember, and Knockout depends on style and needs.

Adds String#indent for padding each line, including blank lines, without introducing trailing whitespace and with optional custom indentation characters.

Link related cards directly from the editor by searching for a card and inserting a Markdown link into the text area.

Add code blocks without indentation using triple backticks, matching GitHub-style fenced code blocks for easier formatting in plain text and Markdown.

Capistrano can check out code on the target server using SSH agent forwarding instead of a separate repository key. ssh_options[:forward_agent] = true enables this, but it should be used with caution.

Recover a file from another branch or earlier commit without switching the whole repository. git show displays it, and git checkout restores it into the working tree.

CookieOverflow in ActionController::Session::CookieStore means session or flash data exceeds cookie size limits, often from storing too much object data.

Ruby can re-run a rescued begin block with retry, useful for temporary failures such as unavailable remote servers; a termination condition prevents infinite loops.

HTML-attribute tooltips are entity-encoded, so presence checks need decoded text or encoded matching in Capybara.

Check a gem’s release history to find newer compatible versions, especially when you need a Rails 2 variant of an installed library.

Float rounding can make Graticule’s spherical distance calculation call acos with values slightly outside the valid range, breaking zero-distance cases.

CKEditor dialog tabs and fields can be adapted to fit a custom editing workflow.

Git index corruption blocks commands like git status and git pull, but uncommitted changes remain. Removing .git/index and resetting the branch restores the repository.

Mac OS X Lion 10.7.2 can ignore /etc/hosts and break local name resolution, so Apache virtual hosts and Passenger settings stop working as expected.

jQuery plugin that creates a realistic page-flip transition for HTML5 content, suitable for book- or magazine-style browsing in modern browsers.

Helpers for inspecting and manipulating Capybara browser cookies in integration tests, with support for rack-test and Selenium WebDriver.

Truncates one variable-length label while keeping a second label visible on the same line, with a JavaScript fallback for browsers without the needed layout.