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Like slices, maps hold references to an underlying data structure. So by assigning its value to another variable, only the reference will be passed. To copy the map, it is necessary to create another map and copy each value: // Create the original map originalMap := make(map[string]int) originalM...

ob_start is especially handy when you have redirections on your page. For example, the following code won't work: Hello! <?php header("Location: somepage.php"); ?> The error that will be given is something like: headers already sent by <xxx> on line <xxx>. In or...

The HTML attribute contenteditable provides a simple way to turn a HTML element into a user-editable area <div contenteditable>You can <b>edit</b> me!</div> Native Rich-Text editing Using JavaScript and execCommandW3C you can additionally pass more editing features to th...

This book is known as CLtL2. This is the second edition of the book Common Lisp the Language. It was published in 1990, before the ANSI CL standard was final. It took the original language definition from the first edition (published in 1984) and described all changes in the standardization process...

data.table extends reshape2's melt & dcast functions (Reference: Efficient reshaping using data.tables) library(data.table) ## generate some data dt <- data.table( name = rep(c("firstName", "secondName"), each=4), numbers = rep(1:4, 2), value = rnorm(8) ) ...

library(tidyr) ## example data set.seed(123) df <- data.frame( name = rep(c("firstName", "secondName"), each=4), numbers = rep(1:4, 2), value = rnorm(8) ) df # name numbers value # 1 firstName 1 -0.56047565 # 2 firstName 2 -0.2301...

To start tinkering with Roslyn you will need the following NuGet packages: The C# and VB compilers - Microsoft.Net.Compilers. To install it you can run the following command in the Package Manager Console: nuget install Microsoft.Net.Compilers The Language APIs and Services - Microsoft.Co...

pyinstaller myscript.py -F The options to generate a single file are -F or --onefile. This bundles the program into a single myscript.exe file. Single file executable are slower than the one-folder bundle. They are also harder to debug.

For the sake of this example, it is assumed the user is running Jetty as a distribution. For information on how to run Jetty as an embedded web server, please refer to the official documentation. Jetty can be downloaded from here and is available in both .zip and .gzip formats. Current versions of ...

XSD, XML Schema Definition, is a language which describes the structure of XML documents. XSD files can be used to validate an XML file. The process of doing this will depend on what you choose to implement it with. Care should be taken to ensure the validation engine you use is compatible with the ...

In HTTP 1.1, a minimal HTTP request consists of a request line and a Host header: GET /search HTTP/1.1 \r\n Host: google.com \r\n \r\n The first line has this format: Method Request-URI HTTP-Version CRLF Method should be a valid HTTP method; one of [1][2]: OPTIONS GET HEAD POST PUT ...

Header fields (usually just called ‘headers’) may be added to an HTTP request to provide additional information with the request. A header has semantics similar to parameters passed to a method in any programming language that supports such things. A request with Host, User-Agent and Referer header...

Some HTTP requests may contain a message body. This is additional data that the server will use to process the request. Message bodies are most often used in POST or PATCH and PUT requests, to provide new data that the server should apply to a resource. Requests that include a message body should a...

On CLiki, a Wiki for Common Lisp and free Common Lisp software, a list of Proposed ANSI Revisions and Clarifications is being maintained. Since the Common Lisp standard has not changed since 1994, users have found several problems with the specification document. These are documented on the CLiki p...

The split-sequence library provides a function split-sequence, which allows to split on elements of a sequence (split-sequence:split-sequence #\Space "John Doe II") ;; => ("John" "Doe" "II")

From the official documentation: If you want to get advanced, you can also open up the project file for a specific platform by opening the required XCode or Android Eclipse project in platforms/PLATFORM inside the root of your project. Then, you can build and test from inside the platform-specifi...

There are several good examples of using lambdas as a FunctionalInterface in simple scenarios. A fairly common use case that can be improved by lambdas is what is called the Execute-Around pattern. In this pattern, you have a set of standard setup/teardown code that is needed for multiple scenarios ...

When to use Virtually all WPF controls make heavy use of dependency properties. A dependency property allows for the use of many WPF features that are not possible with standard CLR properties alone, including but not limited to support for styles, animations, data binding, value inheritance, and c...

When to use An attached property is a dependency property that can be applied to any DependencyObject to enhance the behavior of various controls or services that are aware of the property's existence. Some use cases for attached properties include: Having a parent element iterate through its c...

When to use A read-only dependency property is similar to a normal dependency property, but it is structured to not allow having its value set from outside the control. This works well if you have a property that is purely informational for consumers, e.g. IsMouseOver or IsKeyboardFocusWithin. How...