Tutorial by Examples: s

Size Classes and Adaptivity through Storyboard

We can add adaptivity to any subclass of UIView which we add on view controller in nib file. Lets take an example of adding adaptivity using size classes to a view. Add a view on view controller as: Now we need to pin this view to it's superview for fixing it's size and position using con...

iOS • Size Classes and Adaptivity

Async validators

Asynchronous validators allows you to validate form information against your backend (using $http). These kind of validators are needed when you need to access server stored information you can't have on your client for various reasons, such as the users table and other database information. To us...

AngularJS • Form Validation

Detecting missing values with np.nan

If you want to detect missings with df=pd.DataFrame({'col':[1,np.nan]}) df==np.nan you will get the following result: col 0 False 1 False This is because comparing missing value to anything results in a False - instead of this you should use df=pd.DataFrame({'col':[1,np.nan]}) ...

pandas • Gotchas of pandas

Different ways to Select from DropDown list

Below is and HTML page <html> <head> <title>Select Example by Index value</title> </head> <body> <select name="Travel"><option value="0" selected> Please select</option> <option value="1">Car</option&...

selenium-webdriver • Select Class

A basic flask blueprints example

A minimal Flask application looks something like this: from flask import Flask app = Flask(__name__) @app.route("/") def index(): return "Hello World!" A large Flask application can separate one file into multiple files by blueprints. Purpose Make it easier for ...

Flask • Blueprints

One way to report about exceptions on iOS

Go to Main.cs file in iOS project and change existed code, like presented below: static void Main(string[] args) { try { UIApplication.Main(args, null, "AppDelegate"); } catch (Exception ex) { Debug.WriteLine(...

Xamarin.Forms • Exception handling

DynamoDB basic Crud Operation using NodeJS

let doc = require('dynamodb-doc'); let dynamo = new doc.DynamoDB(); var tblName = "MyTable"; exports.handler = (event, context, callback) => { readOperation(context); } function readOperation(cnxt) { var params = { TableName: tblName, Key: { "id": ...

amazon-web-services • Amazon DynamoDB

Tracking an extra property on arrays

class MySubClass(np.ndarray): def __new__(cls, input_array, info=None): obj = np.asarray(input_array).view(cls) obj.info = info return obj def __array_finalize__(self, obj): # handles MySubClass(...) if obj is None: pass ...

numpy • subclassing ndarray

Watching the position

For a more real time solution you can use watchPosition function in Geolocation that notifies whenever an error or a position change occurs. Unlike the getCurrentPosition the watchPosition returns an Observable import {Geolocation} from 'ionic-native'; import template from './custom-component.htm...

ionic2 • Geolocation

HTTP GET request

Sometimes a component needs to render some data from a remote endpoint (e.g. a REST API). A standard practice is to make such calls in componentDidMount method. Here is an example, using superagent as AJAX helper: import React from 'react' import request from 'superagent' class App extends Rea...

React • React AJAX call

Introductory Example on Boost.Python

Things are easy when you have to use a C++ library in a Python project. Just you can use Boost. First of all here is a list of components you need: A CMakeList.txt file, because you're going to use CMake. The C++ files of the C++ project. The python file - this is your python project. Let's...

boost • Using boost.python

Installing and Configuring Symfony

Checking Requirements Run bin/symfony_requirements for checking symfony requirements and php cli setting. Install all packages that needed to run a symfony project. Setting your php.ini for example setting timezone and short_open_tag. Setting both php.ini for your php webserver (eg: /etc/php/apache...

symfony2 • Getting started with symfony2

Alert basic example

<div class="container"> <h2>Alerts</h2> <div class="alert alert-success"> <strong>Success!</strong> </div> <div class="alert alert-info"> <strong>Info!</strong> </div> <div ...

twitter-bootstrap • Alert

Animated Alerts

The .fade and .in classes adds a fading effect when closing the alert message. <div class="alert alert-success fade in"> <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a> <strong>Succ...

twitter-bootstrap • Alert

XAML Usage

<UserControl x:Class="Example.View" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"...

wpf • Supporting Video Streaming and Pixel Array Assignment to an Image Control

Example for data insert or data retrieve from Firebase

Before understand require to follow some setup for project integrate with firebase. Create your project in Firebase Console and download google-service.json file from console and put it in app level module of your project, Follow link for Create Project in console After this we require to...

firebase-database • FirebaseRealtime database with Android

Structure matching

Assume the following structure: var dog = { name : "Woofer", age : 7 }; Enum matching can be performed as follows: var message = switch(dog) { case { name : "Woofer" }: "I know you, Woofer!"; case _: "I don't know you, so...

haxe • Pattern matching

Or patterns

The | operator can be used anywhere within patterns to describe multiple accepted patterns. If there is a captured variable in an or-pattern, it must appear in both its sub-patterns. var match = switch(7) { case 4 | 1: "0"; case 6 | 7: "1"; case _: "2"; ...

haxe • Pattern matching

Guards

It is also possible to further restrict patterns with guards. These are defined by the case ... if(condition): syntax. var myArray = [7, 6]; var s = switch(myArray) { case [a, b] if (b > a): b + ">" +a; case [a, b]: b + "<=" +a; case _:...

haxe • Pattern matching

Extractors

Extractors are identified by the extractorExpression => match expression. Extractors consist of two parts, which are separated by the => operator. The left side can be any expression, where all occurrences of underscore _ are replaced with the currently matched value. The right side is a p...

haxe • Pattern matching