Tutorial by Examples: p

Empty Return

Function TestFunction() As TestClass Return Nothing End Function BAD CODE TestFunction().TestMethod() GOOD CODE Dim x = TestFunction() If x IsNot Nothing Then x.TestMethod() 14.0 Null Conditional Operator TestFunction()?.TestMethod()

Visual Basic .NET Language • NullReferenceException

Width vs Viewport

When we are using "width" with media queries it is important to set the meta tag correctly. Basic meta tag looks like this and it needs to be put inside the <head> tag. <meta name="viewport" content="width=device-width,initial-scale=1"> Why this is impo...

CSS • Media Queries

Installation or Setup

NLTK requires Python versions 2.7 or 3.4+. These instructions consider python version - 3.5 Mac/Unix : Install NLTK: run sudo pip install -U nltk Install Numpy (optional): run sudo pip install -U numpy Test installation: run python then type import nltk NOTE : For older versions of P...

nltk • Getting started with nltk

RippleDrawable

Ripple touch effect was introduced with material design in Android 5.0 (API level 21) and the animation is implemented by the new RippleDrawable class. Drawable that shows a ripple effect in response to state changes. The anchoring position of the ripple for a given state may be specified by call...

Android • Material Design

Download file from FTP server

My.Computer.Network.DownloadFile("ftp://server.my/myfile.txt", "donwloaded_file.txt") This command download myfile.txt file from server named server.my and saves it as donwloaded_file.txt into working directory. You can specify absolute path for downloaded file.

Visual Basic .NET Language • FTP server

Download file from FTP server when login required

My.Computer.Network.DownloadFile("ftp://srv.my/myfile.txt", "donwload.txt", "Peter", "1234") This command download myfile.txt file from server named srv.my and saves it as donwload.txt into working directory. You can specify absolute path for downloaded fil...

Visual Basic .NET Language • FTP server

Upload file to FTP server

My.Computer.Network.UploadFile("example.txt", "ftp://server.my/server_example.txt") This command upload example.txt file from working directory (you could specify absolute path if you want) to server named server.my. File stored on the server will be named server_example.txt. ...

Visual Basic .NET Language • FTP server

Upload file to FTP server when login required

My.Computer.Network.UploadFile("doc.txt", "ftp://server.my/on_server.txt", "Peter", "1234") This command upload doc.txt file from working directory (you could specify absolute path if you want) to server named server.my. File stored on the server will be na...

Visual Basic .NET Language • FTP server

Full example

index.html <button id="increment">Increment</button> <button id="decrement">Decrement</button> <p id="app"></p> index.js import { createStore } from 'redux'; function counter(state = 0, action) { switch (action.type) { ...

redux • Pure Redux - Redux without any framework

Getting binary representation of an image file

This example is inspired by this question. We'll assume you know how to load a file using the File API. // preliminary code to handle getting local file and finally printing to console // the results of our function ArrayBufferToBinary(). var file = // get handle to local file. var reader = new...

JavaScript • Binary Data

Single File Upload using multer

Remember to create folder for upload (uploads in example). install multer npm i -S multer server.js: var express = require("express"); var multer = require('multer'); var app = express(); var fs = require('fs'); app.get('/',function(req,res){ res.sendFil...

Node.js • File upload

Prototype of command line prompt

Module MainPrompt Public Const PromptSymbol As String = "TLA > " Public Const ApplicationTitle As String = GetType(Project.BaseClass).Assembly.FullName REM Or you can use a custom string REM Public Const ApplicationTitle As String = "Short name of the application" Sub M...

Visual Basic .NET Language • Console

Introduction to Python Logging

This module defines functions and classes which implement a flexible event logging system for applications and libraries. The key benefit of having the logging API provided by a standard library module is that all Python modules can participate in logging, so your application log can include your o...

Python Language • Logging

Select dataset except where values are in this other dataset

--dataset schemas must be identical SELECT 'Data1' as 'Column' UNION ALL SELECT 'Data2' as 'Column' UNION ALL SELECT 'Data3' as 'Column' UNION ALL SELECT 'Data4' as 'Column' UNION ALL SELECT 'Data5' as 'Column' EXCEPT SELECT 'Data3' as 'Column' --Returns Data1, Data2, Data4, and Data5

SQL • EXCEPT

Installation or Setup

SAP Crystal Reports can be installed as a standalone program or integrated into Visual Studio. (SAP Crystal Reports for Visual Studio) - Both of which require very little effort outside of the installation wizard.

crystal-reports • Getting started with crystal-reports

RLMObject Base Model Class with Primary Key - Objective-C

An example of a RLMObject base model class that uses a primary key and some generic default properties. Subclasses can then set metadata specific to their needs. @interface BaseModel : RLMObject @property NSString *uuid; @property NSString *metadata; @end @implementation BaseModel + (N...

iOS • Realm

Page width and height

To get current page width and height (for any browser), e.g. when programming responsiveness: function pageWidth() { return window.innerWidth != null? window.innerWidth : document.documentElement && document.documentElement.clientWidth ? document.documentElement.clientWidth : document.bo...

JavaScript • Screen

Load a resource from the classpath

It can be useful to load a resource (image, text file, properties, KeyStore, ...) that is packaged inside a JAR. For this purpose, we can use the Class and ClassLoaders. Suppose we have the following project structure : program.jar | \-com \-project | |-file.txt \-Test.class ...

Java Language • The Classpath

Data reproducibility

dput() and dget() The easiest way to share a (preferable small) data frame is to use a basic function dput(). It will export an R object in a plain text form. Note: Before making the example data below, make sure you're in an empty folder you can write to. Run getwd() and read ?setwd if you need t...

R Language • Reproducible R

Package reproducibility

Package reproducibility is a very common issue in reproducing some R code. When various packages get updated, some interconnections between them may break. The ideal solution for the problem is to reproduce the image of the R code writer's machine on your computer at the date when the code was writt...

R Language • Reproducible R