Tutorial by Examples: r

Sometimes it makes sense to nest view's or routes within one another. For example on the dashboard you want several sub views, similar to tabs but implemented via the routing system, to show the users' projects, contacts, messages ets. In order to support such scenarios the router allows us to defin...

In many cases, for instance when using web views in table view cells, it's important to determine the content size of the rendered HTML page. After loading the page, this can be calculated in the UIWebViewDelegate delegate method: - (void) webViewDidFinishLoad:(UIWebView *) aWebView { CGRect f...

[ alias ] ignored = ! git ls-files --others --ignored --exclude-standard --directory \ && git ls-files --others -i --exclude-standard Shows one line per file, so you can grep (only directories): $ git ignored | grep '/$' .yardoc/ doc/ Or count: ~$ git ignored | ...

Sometimes you may want maintain versions of a git repository on machines that have no network connection. Bundles allow you to package git objects and references in a repository on one machine and import those into a repository on another. git tag 2016_07_24 git bundle create changes_between_tags...

The year, month or day components of a DATE data type can be found using the EXTRACT( [ YEAR | MONTH | DAY ] FROM datevalue ) SELECT EXTRACT (YEAR FROM DATE '2016-07-25') AS YEAR, EXTRACT (MONTH FROM DATE '2016-07-25') AS MONTH, EXTRACT (DAY FROM DATE '2016-07-25') AS DAY FROM D...

Create new Jekyll Post To create a new Jekyll Post, create a new file on _posts directory with the format YYYY-MM-DD-title.MARKUP Replace MARKUP with the file extension for the language you want to use. This is usually Markdown(.md or .markdown) or HTML(.html). _posts/2017-01-01-hello-jekyll.m...

In some cases you might want to add an additional description to an enum value, for instance when the enum value itself is less readable than what you might want to display to the user. In such cases you can use the System.ComponentModel.DescriptionAttribute class. For example: public enum Possibl...

Installing Appcelerator Titanium At first we need to set up Titanium: command-line tools (CLI) to compile the apps the MVC framework Alloy the SDK The main parts are installed using the node.js package manager 'npm'. Check https://nodejs.org/ if you need to install it. Linux (Fedora) If y...

Detecting the current state of the network connection and responding to any changes that might occur, can be done by using one of several plugins. This example is about the cordova-plugin-network-information plugin. Add the plugin to the project: cordova plugin add cordova-plugin-network-informati...

echo "Prints only the matching part of the lines" | grep -o "matching" # prints matching

$sce ("Strict Contextual Escaping") is a built-in angular service that automatically sanitize content and internal sources in templates. injecting external sources and raw HTML into the template requires manual wrapping of$sce. In this example we'll create a simple $sce sanitation f...

string s1 = "string1"; string s2 = "string2"; string s3 = s1 + s2; // "string1string2"

Concatenating strings using a StringBuilder can offer performance advantages over simple string concatenation using +. This is due to the way memory is allocated. Strings are reallocated with each concatenation, StringBuilders allocate memory in blocks only reallocating when the current block is e...

The String.Join method can be used to concatenate multiple elements from a string array. string[] value = {"apple", "orange", "grape", "pear"}; string separator = ", "; string result = String.Join(separator, value, 1, 2); Console.WriteLine(resu...

The $http service is a function which generates an HTTP request and returns a promise. General Usage // Simple GET request example: $http({ method: 'GET', url: '/someUrl' }).then(function successCallback(response) { // this callback will be called asynchronously // when the respo...

HTTP requests are widely used repeatedly across every web app, so it is wise to write a method for each common request, and then use it in multiple places throughout the app. Create a httpRequestsService.js httpRequestsService.js appName.service('httpRequestsService', function($q, $http){ ...

Counting rows based on a specific column value: SELECT category, COUNT(*) AS item_count FROM item GROUP BY category; Getting average income by department: SELECT department, AVG(income) FROM employees GROUP BY department; The important thing is to select only columns specified in the GRO...

A value of a struct type can be written using a struct literal that specifies values for its fields. type Point struct { X, Y int } p := Point{1, 2} The above example specifies every field in the right order. Which is not useful, because programmers have to remember the exact fields in order. M...

PrestaShop can be download here. You can find system requirements here.

The Ionic Platform offers a range of powerful, hybrid-focused mobile backend services and tools to make it easy to scale beautiful, performant hybrid apps, at a rapid pace. In order to use Ionic Platform you need to have the Ionic Framework installed. 1.) Registration (sign-up) You need to enter...