Tutorial by Examples: n

Full commented example

'use strict'; import React, {Component} from 'react'; import ReactNative from 'react-native'; const { AppRegistry, StyleSheet, Text, View, Navigator, Alert, TouchableHighlight } = ReactNative; //This is the app container that contains the navigator stuff class AppC...

react-native • Navigator with buttons injected from pages

Opening a connection to CouchDB

HttpClient httpClient = new StdHttpClient.Builder(). url("http://yourcouchdbhost:5984"). username("admin"). password("password"). build(); CouchDbInstance dbInstance = new StdCouchDbInstance(httpClient);

couchdb • Ektorp java client

Connecting to a database

Given you have a valid CouchDbInstance instance, you connect to a database within CouchDB in the following manner CouchDbConnector connector = dbInstance.createConnector("databaseName", true);

couchdb • Ektorp java client

Getting Started with FirebaseUI

FirebaseUI offers Android, iOS, and Web clients. You can get started with them like so: Android: // app/build.gradle dependencies { // Single target that includes all FirebaseUI libraries compile 'com.firebaseui:firebase-ui:0.5.2' // FirebaseUI Database only compile 'com.f...

firebase • FirebaseUI

Replacing strings in case clauses

Let's say we have multiple data sources which include database, file, prompt and argumentList. Depending on chosen source we change our approach: def loadData(dataSource: Symbol): Try[String] = dataSource match { case 'database => loadDatabase() // Loading data from database case 'file =&g...

Scala Language • Symbol Literals

Use the AdaptiveTrigger to change the UI layout

The UWP applications can run in windowed mode and on several devices. They can be displayed on a wide range of screen sizes from low end phones to the huge surface hub screen. Using relative positioning will be enough for a lot of scenario but as the window size increases, it is always interesting t...

uwp • Adaptive UI

Sharing data to all views

Sometimes you need to set the same data in many of your views. Using View::share // "View" is the View Facade View::share('shareddata', $data); After this, the contents of $data will be available in all views under the name $shareddata. View::share is typically called in a service p...

Laravel • Blade Templates

Resize any image by size & quality

- (UIImage *)drawImageBySize:(CGSize)size quality:(CGInterpolationQuality)quality { UIGraphicsBeginImageContextWithOptions(size, NO, 0.0); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetInterpolationQuality(context, quality); [self drawInRect: CGRectMake (0, 0...

iOS • Resizing UIImage

Push View Animation

Objective C CATransition *animation = [CATransition animation]; [animation setSubtype:kCATransitionFromRight];//kCATransitionFromLeft [animation setDuration:0.5]; [animation setType:kCATransitionPush]; [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEa...

iOS • CAAnimation

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

Integer and NA

Pandas don't support missing in attributes of type integer. For example if you have missings in the grade column: df= pd.read_csv("data.csv", dtype={'grade': int}) error: Integer column has NA values In this case you just should use float instead of integers or set the object dtype. ...

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

Collection.url()

By default, the url property is not defined. Calling fetch() (while using the default Backbone.sync) will result in a GET request to the results of url. var Users = Backbone.Collection.extend({ url: '/api/users', // or url: function () { return '/api/users' } }); va...

backbone.js • Collection

Modifying Model.url()

Model.url and Collection.url are only used internally by the default Backbone.sync method. The default method assumes you are tying into a RESTful API. If you are using a different endpoint design, you will want to override the sync method and may want utilize the url method. var Model = Backbone.M...

backbone.js • url and urlRoot

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