Tutorial by Examples: st

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

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

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

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

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

Use custom middleware + Superagent

This is example has extracted from this boilerplate. Custom middleware: export default function clientMiddleware() { return ({dispatch, getState}) => { return next => action => { if (typeof action === 'function') { return action(dispatch, getState); } ...

redux • Asynchronous Data Flow

Install in Eclipse and Build Hello World

(Tested with ANTLR 4.5.3, Eclipse Neon, ANTLR 4 IDE 0.3.5, and Java 1.8) Download the latest ANTLR. Make sure to get the complete ANTLR Java binaries jar. Save to any appropriate location, for example the folder where other Java libraries are stored. It doesn’t matter where, just remember the loc...

ANTLR • Introduction to ANTLR v4

arranging the window stack (the .lift method)

The most basic case to lift a particular window above the others, just call the .lift() method on that window (either Toplevel or Tk) import tkinter as tk #import Tkinter as tk #change to commented for python2 root = tk.Tk() for i in range(4): #make a window with a label window = tk...

tkinter • Multiple windows (TopLevel widgets)

Saving data as CSV style ASCII file

Analog to np.loadtxt, np.savetxt can be used to save data in an ASCII file import numpy as np x = np.random.random([100,100]) np.savetxt("filename.txt", x) To control formatting: np.savetxt("filename.txt", x, delimiter=", " , newline="\n", comment...

numpy • File IO with numpy

Saving a buffer in a non-existent dir

:!mkdir -p %:h to create the missing directories, then :w

vim • Saving

Detecting a cycle in a directed graph using Depth First Traversal

A cycle in a directed graph exists if there's a back edge discovered during a DFS. A back edge is an edge from a node to itself or one of the ancestors in a DFS tree. For a disconnected graph, we get a DFS forest, so you have to iterate through all vertices in the graph to find disjoint DFS trees. ...

algorithm • Graph

STDDEV

STDDEV returns the sample standard deviation of expr, a set of numbers. You can use it as both an aggregate and analytic function. It differs from STDDEV_SAMP in that STDDEV returns zero when it has only 1 row of input data, whereas STDDEV_SAMP returns null. Oracle Database calculates the standard ...

Oracle Database • Statistical functions

List Controls

ASP.NET provides the following controls Drop-down list List box Radio button list Check box list Bulleted list These control let a user choose from one or more items from the list. List boxes and drop-down lists contain one or more list items. These lists can be loaded either by code or b...

ASP.NET • ASP.NET - Basic Controls

Radio Button list and Check Box list

A radio button list presents a list of mutually exclusive options. A check box list presents a list of independent options. These controls contain a collection of ListItem objects that could be referred to through the Items property of the control. Basic syntax of radio button list: <asp:RadioB...

ASP.NET • ASP.NET - Basic Controls

Bulleted lists and Numbered lists

The bulleted list control creates bulleted lists or numbered lists. These controls contain a collection of ListItem objects that could be referred to through the Items property of the control. Basic syntax of a bulleted list: <asp:BulletedList ID="BulletedList1" runat="server&quo...

ASP.NET • ASP.NET - Basic Controls

What data does the tracking snippet capture?

When you add either of these tracking snippets to your website, you send a pageview for each page your users visit. Google Analytics processes this data and can infer a great deal of information including: The total time a user spends on your site. The time a user spends on each page and in what o...

google-analytics • Getting started with google-analytics

Sensitivity lists and wait statements

A process with a sensitivity list cannot also contain wait statements. It is equivalent to the same process, without a sensitivity list and with one more last statement which is: wait on <sensitivity_list>; Example: process(clock, reset) begin if reset = '1' then q &l...

vhdl • Wait