Tutorial by Examples: c

PM> Install-Package EntityFramework -Version 6.1.2

The json_decode() function takes a JSON-encoded string as its first parameter and parses it into a PHP variable. Normally, json_decode() will return an object of \stdClass if the top level item in the JSON object is a dictionary or an indexed array if the JSON object is an array. It will also retur...

The json_encode function will convert a PHP array (or, since PHP 5.4, an object which implements the JsonSerializable interface) to a JSON-encoded string. It returns a JSON-encoded string on success or FALSE on failure. $array = [ 'name' => 'Jeff', 'age' => 20, 'active' => ...

// Check if service worker is available. if ('serviceWorker' in navigator) { navigator.serviceWorker.register('/sw.js').then(function(registration) { console.log('SW registration succeeded with scope:', registration.scope); }).catch(function(e) { console.log('SW registration failed...

In this case, building against API 23, so permissions are handled too. You must add in the Manifest the following permission (wherever the API level you're using): <uses-permission android:name="android.permission.CAMERA"/> We're about to create an activity (Camera2Activity.java...

In this example, we can use GROUP BY not only determined the sort of the rows returned, but also what rows are returned, since we're using TOP to limit the result set. Let's say we want to return the top 5 highest reputation users from an unnamed popular Q&A site. Without ORDER BY This query ...

This uses the Dropbox Python SDK to create a shared link for a file and also supplies a requested visibility and expiration in the settings: import datetime import dropbox dbx = dropbox.Dropbox("<ACCESS_TOKEN>") expires = datetime.datetime.now() + datetime.timedelta(days=30...

#include <stdio.h> #include <string.h> int main(void) { /* Always ensure that your string is large enough to contain the characters * and a terminating NUL character ('\0')! */ char mystring[10]; /* Copy "foo" into `mystring`, until a NUL character is en...

The strcase*-functions are not Standard C, but a POSIX extension. The strcmp function lexicographically compare two null-terminated character arrays. The functions return a negative value if the first argument appears before the second in lexicographical order, zero if they compare equal, or positi...

int* foo(int bar) { int baz = 6; baz += bar; return &baz; /* (&baz) copied to new memory location outside of foo. */ } /* (1) The lifetime of baz and bar end here as they have automatic storage * duration (local variables), thus the returned pointer is not valid! */ ...

Let's say we have two classes, Cat and Dog. class Cat def eat die unless has_food? self.food_amount -= 1 self.hungry = false end def sound puts "Meow" end end class Dog def eat die unless has_food? self.food_amount -= 1 self.hungry = f...

Let's say you want to generate counts or subtotals for a given value in a column. Given this table, "Westerosians": NameGreatHouseAllegienceAryaStarkCerceiLannisterMyrcellaLannisterYaraGreyjoyCatelynStarkSansaStark Without GROUP BY, COUNT will simply return a total number of rows: SELE...

/* define a list of preprocessor tokens on which to call X */ #define X_123 X(1) X(2) X(3) /* define X to use */ #define X(val) printf("X(%d) made this print\n", val); X_123 #undef X /* good practice to undef X to facilitate reuse later on */ This example will result in the prep...

Basics The Reflection API allows one to check the class structure of the code at runtime and invoke code dynamically. This is very powerful, but it is also dangerous since the compiler is not able to statically determine whether dynamic invocations are valid. A simple example would be to get the p...

Syntax for accessing rows and columns: [, [[, and $ This topic covers the most common syntax to access specific rows and columns of a data frame. These are Like a matrix with single brackets data[rows, columns] Using row and column numbers Using column (and row) names Like a list: Wi...

To use an accordion, one must have headers and content inside the headers in their HTML. Then one must instantiate the accordion() method of jQuery UI. <script> $(function() { $( "#accordion" ).accordion(); }); </script> In the HTML: <div id="accordion&quot...

$( "#accordion" ).accordion( "destroy" ); This will remove the accordion functionality completely and show default HTML removing all the jQuery-UI elements. This method does not take any arguments.

$( "#accordion" ).accordion( "disable" ); This method will disable the accordion, i.e. the headers are not selectable making the content read only and static. This method does not take any arguments.

$( "#accordion" ).accordion( "enable" ); This method will enable an accordion. This will enable a disabled accordion or simply do nothing on an already enabled accordion. This method does not take any arguments.

var options = $( "#accordion" ).accordion( "option" ); This will return a PlainObject giving all the options representing the selected accordion. This will contain all the values of the keys that are explained in the Parameters section. This method takes parameters which are ...