...are usually believed to have worse performance than those defined via def. Hence, developers sometimes prefer using class_eval to define methods using def, like this: class_eval "def #{attribute...
...for_realsies?; do_things; end" You can benchmark methods defined like this and will see that those defined via def actually do perform better. Basically, it ranks like this:
...version understands? Did you double-check your @font-face declarations with all the hacky syntax that is required? Compare them with other declarations you find on the web.
...same name? This usually leads to trouble, but there are workarounds. Do IE's security settings prevent the download of webfonts? (see below) IE Security Settings can prevent font download...
Ever wondered how you can create a simple table output in bash? You can use the tool column for creating a simple table output. Column gives you the possibility to...
...same level. Pipe output to column -t (maybe configure the delimeter with -s) and see the magic happening. detailed example I needed to separate a list of databases and their...
Select2 is a fantastic library for advanced dropdown boxes, but it depends on jQuery. Alternatives Tom Select There is a selectize.js fork called Tom Select. It is well tested, comes...
...with Bootstrap 3, Bootstrap 4 and Bootstrap 5 styles and is easy to use. You might miss some advanced features. Known issues: Dynamic opt-groups in AJAX requests are not...
To set a cookie in your test browser for cucumber tests, you need to know which driver you are using. Use the step below according to your driver.
...to "([^\"]+)"$/ do |key, value| headers = {} Rack::Utils.set_cookie_header!(headers, key, value) cookie_string = headers['Set-Cookie'] Capybara.current_session.driver.browser.set_cookie(cookie_string) end Note that Rack::Utils is only used to...
...ae]y => grey or gray => but NOT graay or graey [0-9] matches a SINGLE digit in the range from 0 to 9 [0-9a-fA-F] hexadecimal digit...
...with caution. Mostly you'll want to use it for small expressions, e.g. for nested sub-regexes. For more details have a look at the card on quantifier modes.
Starting Terminator with split screens is quite simple: Just store a layout and start Terminator with the --layout option. However, if you want to run custom commands in your terminals...
...command exits. You accomplish this by tweaking bash to run a command before actually starting. Pimp your .bashrc Add this to the end of .bashrc: # hack to keep a bash...
Git log offers useful options for filtering. This card provides a short overview. By message Only commits that include a specific string in their commit message git log --grep="tracker...
By file Only commits that introduced changes to a specific file git log -- foo.rb bar.rb Note In case the file was renamed or moved the --follow option can be...
Bundler allows you to specify the name of the Gemfile you want to bundle with the BUNDLE_GEMFILE environment variable. BUNDLE_GEMFILE=Gemfile.rails.7.2 bundle By default, bundler will look...
...have multiple Gemfiles in your project, which cannot all be named Gemfile. Let's say for example, you maintain a gem and want to run automated tests against multiple rails...
This returns the name (including path) of your current layout: response.layout => "layouts/admin" # inside views that are using the 'admin' layout...
This is for people recovering from Subversion. Get an existing from the server for the first time git clone git@example.com:repositoryname See what's changed git status Check in locally...
...git commit -m "good description" Push local commits to the server git push Get and merge updates from the server git pull Stage a file for the next local commit...
...multiple custom ways to format Dates or DateTimes. This often leads to duplicated format strings, wrong formats and unnecessary introduction of new formats. to_fs also supports to refer to...
...those formats by name e.g. to_formatted_s(:iso_8601) or to_formatted_s(:short). to_fs is an alias for to_formatted_s. Those names are defined in Time...
This raises "Could not find first Keyword": describe Keyword do it { should validate_uniqueness_of(:text) } end Do this instead...
...with additional margin towards their container. Starting with version 121, Chrome now also supports the spec-compliant properties scrollbar-width and scrollbar-color. These allow less styling. You may only...
...track and thumb colors, and a non-specific width like auto, thin, or none. .example { scrollbar-width: thin; scrollbar-color: blue lightblue; } Styling the -webkit-scrollbar-* pseudo elements is still...
JavaScript objects can have getter and setter functions that are called when a property is read from or written to. For example, if you'd like an object that has...
...person.firstName and person.lastName: var person = { firstName: 'Guybrush', lastName: 'Threepwood', get fullName() { return this.firstName + " " + this.lastName; }, set fullName(name) { var parts = name.split(" "); this.firstName = parts[0]; this.lastName = parts[1]; } }; The code below shows...
When you have string contents (e.g. a generated binary stream, or data from a remote source) that you want to store as a file using Carrierwave, here is a simple...
While you could write your string to a file and pass that file to Carrierwave, why even bother? You already have your string (or stream). However, a plain StringIO...
Somewhat regularly, you will need to filter a list down to some items and then map them to another value. You can of course chain map and compact, or select/filter...
...if i.even? }.compact => [4, 8, 12] or >> [1, 2, 3, 4, 5, 6].select(&:even?).map { |i| i * 2 } => [4, 8, 12] you can just do...
...a web developer, you know Google Analytics (GA). Probably you've dropped the GA snippet into more than one website, maybe you've even used its Javascript API to implement...
...configurable without changing anything in the application's code base (and much more beyond, see below). Only prefer GTM if the customer requests it, or if he is updating his...
Version 3.7.0 broke some things in complex forms. Sorry for that. Concurrent user input is hard. 3.7.1 This change fixes two regressions for form field watchers, introduced by 3.7.0:
...a validation for a fragment while a validation request for the same target is still loading. Validations no longer throw an error if a targeted fragment is destroyed while a...
...bodies with a maximum of 4096 characters. You can work around that limit by splitting the text into smaller fragments and stitch together the resulting mp3 files with a CLI...
...tool like mp3wrap or ffmpeg. Example Ruby Implementation Usage input_text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua...
Ctrl + Alt + S > search "rubocop on save" Under "Inspections", check the highlighted box on rubocop -a Caveat: This adds a little time overhead to saving. When you're editing many...
In order to have monitoring for Sidekiq (like queue sizes, last run of Sidekiq) your application should have a monitoring route which returns a json looking like this: { "sidekiq": {
...queue_sizes": { "dead": 0, "retries": 0, "monitoring": 0, "low_priority": 0, "mails": 0, "default": 0, "elasticsearch": 0, "high_priority": 0, "file_upload": 0, "scheduled": 0 }, "active_workers": 0 }, "timestamps": {
Plot graphs in Ruby WebGraphviz renders in your browser via JavaScript (to store the rendered graph, extract the SVG using your browser's DOM inspector) GraphViz with DOT: Online...
...graphviz.christine.website/ or offline https://makandracards.com/makandra/1589-auto-generate-state_machine-graphs-as-png-images Balsamiq Draw.io Excalidraw Asciiflow Google Presentation Egon.io: Domain storytelling with replay functionality (good to visualize and present flows) Gnuplot Ruby Bindings: Especially for more...
Native promises have no methods to inspect their state. You can use the promiseState function below to check whether a promise is fulfilled, rejected or still pending: promiseState(promise, function...
// `state` now either "pending", "fulfilled" or "rejected" }); Note that the callback passed to promiseState will be called asynchronously in the next microtask. Usage example: Tests Note Since this card...