Tutorial by Topics: es

Python offers itself not only as a popular scripting language, but also supports the object-oriented programming paradigm. Classes describe data and provide methods to manipulate that data, all encompassed under a single object. Furthermore, classes allow for abstraction by separating concrete imple...

[ "$1" = "$2" ] #A "[" bracket is actually a command. Because of this it requires a space befor and after it. test "$1" = "$2" #Test is a synonym for the "[" command Parameter to [ or testDetailsFile OperatorsDetails-e "$file&...

string date ( string $format [, int $timestamp = time() ] ) int strtotime ( string $time [, int $now ] )

data.frame(..., row.names = NULL, check.rows = FALSE, check.names = TRUE, stringsAsFactors = default.stringsAsFactors()) as.data.frame(x, row.names = NULL, optional = FALSE, ...) # generic function as.data.frame(x, ..., stringsAsFactors = default.stringsAsFactors()) # S3 method for cl...

All preprocessor commands begins with the hash (pound) symbol #. A C macro is just a preprocessor command that is defined using the #define preprocessor directive. During the preprocessing stage, the C preprocessor (a part of the C compiler) simply substitutes the body of the macro wherever its nam...

require Module::Name; # Require by name from @INC require "path/to/file.pm"; # Require by relative path from @INC use Module::Name; # require and default import at BEGIN use Module::Name (); # require and no import at BEGIN use Module::Name (@ARGS); # require and import with args at...

The init() is a special method in classes which is used to declare an initializer for the class. More information can be found here: Initializers

Classes, functions, and (since C++14) variables can be templated. A template is a piece of code with some free parameters that will become a concrete class, function, or variable when all parameters are specified. Parameters can be types, values, or themselves templates. A well-known template is std...

A 9-patch image file is a specially formatted file so that Android knows which areas/portions of the image can or cannot be scaled. It breaks your image into a 3x3 grid. The corners remain unscaled, the sides are scaled in one direction and the center is scaled in both dimensions. A Nine Patch ...

read.csv(file, header = TRUE, sep = ",", quote = """, dec = ".", fill = TRUE, comment.char = "", ...) read.csv2(file, header = TRUE, sep = ";", quote = """, dec = ",", fill = TRUE, comment.char = "", ....

Express is a minimal and flexible Node.js web application framework, providing a robust set of features for building web applications. The official website of Express is expressjs.com. The source can be found on GitHub. app.get(path [, middleware], callback[, callback...]) app.put(path [, mi...

void session_abort ( void ) int session_cache_expire ([ string $new_cache_expire ] ) void session_commit ( void ) string session_create_id ([ string $prefix ] ) bool session_decode ( string $data ) bool session_destroy ( void ) string session_encode ( void ) int session_gc ( void ) array ...

There are many situations where it is useful to return several values from a function: for example, if you want to input an item and return the price and number in stock, this functionality could be useful. There are many ways to do this in C++, and most involve the STL. However, if you wish to avoi...

In Node.js, resource intensive operations such as I/O are performed asynchronously, but have a synchronous counterpart (e.g. there exists a fs.readFile and its counterpart is fs.readFileSync). Since Node is single-threaded, you should be careful when using synchronous operations, because they will...

Use context processors to add variables that are accessible anywhere in your templates. Specify a function, or functions that return dicts of the variables you want, then add those functions to TEMPLATE_CONTEXT_PROCESSORS.

import defaultMember from 'module'; import { memberA, memberB, ... } from 'module'; import * as module from 'module'; import { memberA as a, memberB, ... } from 'module'; import defaultMember, * as module from 'module'; import defaultMember, { moduleA, ... } from 'module'; import 'module'; ...

Used to prevent name collisions when using multiple libraries, a namespace is a declarative prefix for functions, classes, types, etc. namespace identifier(opt) { declaration-seq } inline namespace identifier(opt) { declaration-seq } /* since C++11 */ inline(opt) namespace attribute-specifie...

AttributeDetailsnameSets the element's name, to be used with an a tag to change the iframe's src.widthSets the element's width in pixels.heightSets the element's height in pixels.srcSpecifies the page that will be displayed in the frame.srcdocSpecifies the content that will be displayed in the fra...

An HTTP cookie is a small piece of data sent from a website and stored on the user's computer by the user's web browser while the user is browsing. bool setcookie( string $name [, string $value = "" [, int $expire = 0 [, string $path = "" [, string $domain = "" [,...