You must reconfigure the guest so it will get its own IP address: Shutdown the guest In the guest's VirtualBox settings, choose Network and switch the network adapter type...
...Unix) or ipconfig (Windows) You can now connect to this IP address using HTTP, SSH, etc. Note that by doing this your VirtualBox guest is fully exposed on the local...
...not play nice with gnome-open. You can fix the problem by uninstalling it: sudo apt-get remove exo-utils Note that this may also uninstall XFCE tools like xfce4...
To reduce download time, application servers usually serve content using gzip compression, if the browser supports it. When using a tool like Wget to explicitly download an application's response...
...the server responds with the uncompressed version: wget http://example.com/ If you are curious about the compressed file's size, pass the corresponding HTTP header: wget --header="accept-encoding: gzip...
By default, Twitter Bootstrap's print styles include printing links. /* Bootstrap's way of printing URLs */ @media print { a[href]:after { content: " (" attr(href) ")"; } } If you want to turn that...
If your Webpack build is slow, you can use the Speed Measure Plugin for Webpack to figure out where time is being spent. Note that at time of writing, Webpack...
...now have an idea where optimization might be feasible. Look around for suggestions, e.g. the sass-loader readme when you want to optimize Sass build time...
You can use scheme-less URLs (or protocol-relative URLs) to have browsers use the current protocol (HTTP or HTTPS) when loading content referenced with such an URL.
...relative URL doesn’t contain a protocol. For example, http://stevesouders.com/images/book-84x110.jpg becomes //stevesouders.com/images/book-84x110.jpg Browsers substitute the protocol of the page itself for the resource’s missing protocol. Problem solved...
Webfonts are not always available when your JavaScript runs on first page load. Since fonts may affect element sizes, you may want to know when fonts have been loaded to...
...Promise that will be resolved once the font is available. Example: document.fonts.load('1rem "Open Sans"').then(() => {...
jQuery / fontSpy If your project uses jQuery, you could also use jQuery-FontSpy which...
Sometimes you want to see what data you get through a TCP or UDP connection. For example, you want to know how a HTTP Request look like.
...easy with netcat. Example to listen on port 80 and the output gets to stdout. sudo nc -kl 80 It's also possible write it into a file:
...on an old version of ImageMagick that you can no longer install in your system, you can choose the run an old ImageMagick in a Docker container. Dockerized ImageMagick commands...
...path arguments. You need to boot a corresponding docker container once before using it. Setting up Docker If you haven't installed Docker yet, use our guide or the official...
The linked article provides a good overview of the various concurrency primitives in Ruby, and what's changing in Ruby...
...will never return the current element itself, even if the element matches the given selector. Require the attached file and you can now say: $('.container').findWithSelf('.selector')
Find conditions for scopes can be given either as an array (:conditions => ['state = ?', 'draft']) or a hash (:conditions => { 'state' => 'draft' }). The later is nicer to read, but has horrible security...
...versions of Ruby on Rails. Affected versions Version Affected? Remedy 2.3.18 yes Use chain_safely workaround 3.0.20 no 3.1.x ??? 3.2.22 yes Use Rails LTS 3.2 with hardened configuration...
When you're getting this error, one possibility is that you've created a select field for an association instead of the associated object's id. Example: form.select :unit, Unit.for...
will be expected to deliver a real Unit object, whereas form.select :unit_id, Unit.for_select will make Rails typecast the String value from the select field to the unit...
...an npm package. Naming convention for pre-release versions An npm package must use Semantic Versioning's naming convention for its version. In Semantic Versioning, the version number and pre...
...release identifier (like rc1) must be separated by a dash, like this: 1.0.0-rc1 2.3.0-alpha2 3.0.0-beta3 Publishing to a pre-release tag npm packages have multiple "current" releases...
You have to specify the environment with -e env_name or RAILS_ENV=env_name if you want to run a script on the server. at Rails 2 it's...
bundle exec script/runner -e env_name path/to/script.rb argument1 argument2 ... at Rails 3 it's rails runner RAILS_ENV=env_name bundle exec rails runner path/to/script.rb argument1 argument2...
Since May 2011 we are cutting new gems using Bundler, which is less painful than cutting gems using Jeweler. You know a gem was cut using Bundler if you see...
This is how to update a gem that was cut using Bundler: Say git pull or check out a repository from Github like git clone git@github.com:makandra/geordi.git
JavaScript engines such as Google’s V8 (Chrome, Node) are specifically designed for the fast execution of large JavaScript applications. As you develop, if you care about memory usage and...
...what’s going on in your user’s browser’s JavaScript engine behind the scenes...
The colors in Rails log files are helpful when watching them but, since they are ANSI color codes like ^[[4;36;1m, can be annoying when you are reading the...
...that does just prints those control characters (like less or vim). Remove them with sed: cat staging.log | sed -r "s/\x1B\[([0-9]{1,3}((;[0-9]{1,3})*)?)?[m...
Sometimes you want Angular to watch an object only until a certain state is reached (e.g. an object appears in the scope). Angular's $watch returns a method that you...
...can call to remove that watch. For example: unwatch = $scope.$watch 'user', (user) -> if user?
unwatch()
DevDocs combines multiple API documentations in a fast, organized, and searchable interface. Here's what you should know before you start: You don't have to use your mouse — see...
...the list of keyboard shortcuts The search supports fuzzy matching (e.g. "bgcp" brings up "background-clip") To search a specific documentation, type its name (or an abbreviation), then Tab
It's every developer's nightmare: SQL queries that get large and unwieldy. This can happen fairly quickly with the addition of multiple joins, a subquery and some complicated filtering...
...logic. I have personally seen queries grow to nearly one hundred lines long in both the financial services and health industries. Luckily Postgres provides two ways to encapsulate large queries...
Ruby's String#split returns an array of substrings from the given string. Usually, this is missing the split characters: >> 'user@example.com'.split('@') => ["user", "example.com"] If you want to join those...
...parts later on, you might know the split character and can just use it to join explicitly. But if you split by a regular expression (for a set of split...
...methods and properties) video = document.querySelector('video') video.play() video.pause() video.load() // Reset to the beginning and select the best available source video.currentSrc // The selected source video.currentTime // The current playback time (in seconds...
...video.ended // Whether the video has finished video.muted video.paused video.readyState // See comments video.volume Comments controls makes the browser show its own video controls The image given in poster will be shown...
In large forms (30+ controls) new Capybara version become [extremely slow] when filling out fields. It takes several seconds per input. The reason for this is that Capybara generates a...
...huge slow XPath expression to find the field. The attached code patches fill_in with a much faster implementation. It's a dirty fix and probably does a lot less...