Tutorial by Topics

Some implementations of Markdown, such as Stack Exchange's, support spoiler quotes, which look the same, but hide the content of the quote until you click on it.

While everything in Node.js is generally done asynchronously, require() is not one of those things. Since modules in practice only need to be loaded once, it is a blocking operation and should be used properly. Modules are cached after the first time they are loaded. Should you be editing a modul...

SELECT column_1 [, column_2 ] FROM table_1 ORDER BY order_column LIMIT row_count [OFFSET row_offset] SELECT column_1 [, column_2 ] FROM table_1 ORDER BY order_column LIMIT [row_offset,] row_count "Limit" could mean "Max number of rows in a table". "Offset&q...

Text formatting in markdown usually requires characters at both the beginning and end of the text.

@interface ClassName (categoryName) // ClassName is the class to be extended // Method and property declarations @end To avoid method name clashes, it is recommended to use prefixes (like xyz_ in the example). If methods with the same name exist, it is undefined which one will...

Scanner scanner = new Scanner(Source source); Scanner scanner = new Scanner(System.in); ParameterDetailsSourceSource could be either one of String, File or any kind of InputStream The Scanner class was introduced in Java 5. The reset() method was added in Java 6, and a couple of new cons...

inline: `Code between backticks` or <code>Code between these HTML tags</code> multiline: ____Code that is indented on each line or <pre><code>Multiple lines of code between these HTML tags</code></pre>

An assertion is a predicate that the presented condition must be true at the moment the assertion is encountered by the software. Most common are simple assertions, which are validated at execution time. However, static assertions are checked at compile time. assert(expression) static_assert(...

Oracle is a relational database management system (RDBMS) originally built by Larry Ellison, Bob Miner, and Ed Oates in the late 70s. It was intended to be compatible with IBM's System R. VersionRelease DateVersion 1 (unreleased)1978-01-01Oracle V21979-01-01Oracle Version 31983-01-01Oracle Ver...

The C language does not define a linked list data structure. If you are using C and need a linked list, you either need to use a linked list from an existing library (such as GLib) or write your own linked list interface. This topic shows examples for linked lists and double linked lists that ca...

In C++, it is possible to define operators such as + and -> for user-defined types. For example, the <string> header defines a + operator to concatenate strings. This is done by defining an operator function using the operator keyword. The operators for built-in types cannot be change...

Bosun is an open-source, MIT licensed, monitoring and alerting system created by Stack Overflow. It has an expressive domain specific language for evaluating alerts and creating detailed notifications. It also lets you test your alerts against historical data for a faster development experience. M...

find is a command to recursively search a directory for files(or directories) that match a criteria, and then perform some action on the selected files. find search_path selection_criteria action find [-H] [-L] [-P] [-D debugopts] [-Olevel] [path...] [expression]