Tutorial by Examples: en

Install local development version of a package

While working on the development of an R package it is often necessary to install the latest version of the package. This can be achieved by first building a source distribution of the package (on the command line) R CMD build my_package and then installing it in R. Any running R sessions with p...

Element Spacing
Outlook can sometimes add a bit of spacing on the left and right side of a element that can cause some layout-related headaches. By using the vendor-specific mso-table-lspace and mso-table-rspace CSS properties, you can be rid of those spaces and continue on to tackle the million other problems cau...

Enable Extension

Edit Mercurial.ini (Windows) or .hgrc (Linux/OSX): [extenstions] mq =

Extending Behat with Mink

Mink provides an interface for web drivers (like Goutte and Selenium) as well as a MinkContext which, when extended, provides additional web language for our steps. To install Mink (and the default Goutte driver): $ composer require --dev behat/mink-extension="^2.0" $ composer require -...

Testing JavaScript with Mink and Selenium

If we want to test JavaScript on a website, we'll need to use something a bit more powerful than Goutte (which is just cURL via Guzzle). There are a couple of options such as ZombieJS, Selenium and Sahi. For this example I'll use Selenium. First you'll need to install the drivers for Mink: $ compo...

Generating callgraph diagrams with gperf2dot

For more complex applications, flat execution profiles may be difficult to follow. This is why many profiling tools also generate some form of annotated callgraph information. gperf2dot converts text output from many profilers (Linux perf, callgrind, oprofile etc.) into a callgraph diagram. You can...

Identity Monad

This is an example of an implementation of the identity monad in JavaScript, and could serve as a starting point to create other monads. Based on the conference by Douglas Crockford on monads and gonads Using this approach reusing your functions will be easier because of the flexibility this monad...

Using shell without extending Mage_Shell_Abstract

Bootstrapping Magento by calling: require_once 'app/Mage.php'; Mage::app(); // Your code This is the simplest way but not really the Magento way because we're not using class that extends Mage_Shell_Abstract - the class which when extended provides us with tools to parse command line arguments...

Using shell the Magento way - extend Mage_Shell_Abstract

Magento way File resides in shell/custom.php <?php require_once' abstract.php'; class Stackoverflow_Shell_Custom extends Mage_Shell_Abstract { protected $_argname = array(); public function __construct() { parent::__construct(); // Time limit to infinity ...

Using std::nth_element To Find The Median (Or Other Quantiles)

The std::nth_element algorithm takes three iterators: an iterator to the beginning, nth position, and end. Once the function returns, the nth element (by order) will be the nth smallest element. (The function has more elaborate overloads, e.g., some taking comparison functors; see the above link for...

Extensions overview

An incomplete list of WinDbg extensions that are not installed with WinDbg itself: ExtensionPurposeSOS.NET (official Microsoft extension)SOSex.NET (extension for SOS)CoSOS.NET (extension for SOS)NetExt.NET (with focus on networking)PyKDPython scriptingPDEWindows native and store applications (stowe...

Disable auto-indent to paste code

When pasting text through a terminal emulator, the auto-indent feature may destroy the indentation of the pasted text. For example: function () { echo 'foo' echo 'bar' echo 'baz' } will be pasted as: function () { echo 'foo' echo 'bar' echo 'baz' ...

Destroying an object that has already been destroyed

In this example, a destructor is explicitly invoked for an object that will later be automatically destroyed. struct S { ~S() { std::cout << "destroying S\n"; } }; int main() { S s; s.~S(); } // UB: s destroyed a second time here A similar issue occurs when a st...

Convert text file encoding

Text is saved encoded (see also Strings topic) then sometimes you may need to change its encoding, this example assumes (for simplicity) that file is not too big and it can be entirely read in memory: public static void ConvertEncoding(string path, Encoding from, Encoding to) { File.WriteAllT...

Enumerate files older than a specified amount

This snippet is an helper function to enumerate all files older than a specified age, it's useful - for example - when you have to delete old log files or old cached data. static IEnumerable<string> EnumerateAllFilesOlderThan( TimeSpan maximumAge, ...

Code snippets inside documentation

The canonical way of writing code inside documentation is with the {@code } construct. If you have multiline code wrap inside <pre></pre>. /** * The Class TestUtils. * <p> * This is an {@code inline("code example")}. * <p> * You should wrap it in pre tags...

Using Extension methods to create beautiful mapper classes

We can create a better mapper classes with extension methods, Suppose if i have some DTO classes like public class UserDTO { public AddressDTO Address { get; set; } } public class AddressDTO { public string Name { get; set; } } and i need to map to corresponding v...

Fetching all the documents with word "marklogic"

cts:search( fn:doc(), cts:word-query("marklogic"))

Fetching all the documents with word "marklogic", document in collection "first-collection"

This can be done in the following two ways - cts:search( fn:collection("first-collection"), cts:word-query("marklogic")) In this, the scope is changed from all the documents to documents in collection "first-collection" only. In the second approach, use ...

Fetching all the documents with a particular value of an element

This query returns all the documents with element "company" and its value as "marklogic" cts:element-value-query(xs:QName('company'), 'marklogic'))

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