Tutorial by Examples: e

The ConstainsKey method is the way to know if a key already exists in the Dictionary. This come in handy for data reduction. In the sample below, each time we encountner a new word, we add it as a key in the dictionary, else we increment the counter for this specific word. Dim dic As IDictionary(...

Pancake Sort is a the colloquial term for the mathematical problem of sorting a disordered stack of pancakes in order of size when a spatula can be inserted at any point in the stack and used to flip all pancakes above it. A pancake number is the minimum number of flips required for a given number o...

public class PancakeSort { private static void SortPancake(int[] input, int n) { for (var bottom = n - 1; bottom > 0; bottom--) { var index = bottom; var maxIndex = input[bottom]; int i; for (i = bottom - 1; i >= ...

You can use a TStringList to store Key-Value pairs. This can be useful if you want to store settings, for example. A settings consists of a Key (The Identifier of the setting) and the value. Each Key-Value pair is stored in one line of the StringList in Key=Value format. procedure Demo(const FileN...

@echo off setlocal set /p "_myvar=what is your name?" echo HELLO!>file.txt echo %_myvar%!>>file.txt echo done! pause type file.txt endlocal exit Now file.txt looks like: HELLO! John Smith! (assuming you typed John Smith as your name.) Now your batch file's consol...

The ASCII way This shifts the characters but doesn't care if the new character is not a letter. This is good if you want to use punctuation or special characters, but it won't necessarily give you letters only as an output. For example, "z" 3-shifts to "}". def ceasar(text, shi...

To connect to a mongo database from node application we require mongoose. Installing Mongoose Go to the toot of your application and install mongoose by npm install mongoose Next we connect to the database. var mongoose = require('mongoose'); //connect to the test database running on defau...

With Mongoose, everything is derived from a Schema. Lets create a schema. var mongoose = require('mongoose'); var Schema = mongoose.Schema; var AutoSchema = new Schema({ name : String, countOf: Number, }); // defining the document structure // by default the collection...

For inserting a new document in the collection, we create a object of the schema. var Auto = require('models/auto') var autoObj = new Auto({ name: "NewName", countOf: 10 }); We save it like the following autoObj.save(function(err, insertedAuto) { if (err) return cons...

Reading Data from the collection is very easy. Getting all data of the collection. var Auto = require('models/auto') Auto.find({}, function (err, autos) { if (err) return console.error(err); // will return a json array of all the documents in the collection console.log(autos)...

Deleting documents from a collection in mongoose is done in the following manner. Auto.remove({_id:123}, function(err, result){ if (err) return console.error(err); console.log(result); // this will specify the mongo default delete result. });

You can use plugman command to install/uninstall custom cordova plugins. To install plugman npm install -g plugman Install plugin command syntax: plugman <install|uninstall> --platform <ios|android|blackberry10|wp8> --project <directory> --plugin <name|url|path> Exa...

The names of modules follow the filesystem's hierarchical structure. With the following file layout: Foo/ ├── Baz/ │ └── Quux.hs └── Bar.hs Foo.hs Bar.hs the module headers would look like this: -- file Foo.hs module Foo where -- file Bar.hs module Bar where -- file Foo/Bar.hs m...

systemd provides a modern implementation of cron. To execute a script periodical a service and a timer file ist needed. The service and timer files should be placed in /etc/systemd/{system,user}. The service file: [Unit] Description=my script or programm does the very best and this is the descri...

Detailed instructions on getting slick set up or installed. http://kenwheeler.github.io/slick/ Slick Slider is easy to use and to customise. It provides good amount of customisation options including responsive options based on breakpoints. To get started with slick, it is not that difficult. Jus...

C# Visual Studio 2015 (latest update) - you can download the community version here for free: www.VisualStudio.com Important: update all VS extensions to their latest versions Tools->Extensions and Updates->Updates Download the Bot Application template from here: Template Dow...

Below is an example of Gstreamer pipeline embedded in a simple gtk window. When run, a small window should appear like this: import gi gi.require_version('Gtk', '3.0') gi.require_version('Gst', '1.0') from gi.repository import Gtk, Gst Gst.init(None) Gst.init_check(None) class GstWidg...

Below is a configuration file for log4j. Log4j2 can use the same syntax, but there are different appender classes: log4j.rootLogger=INFO, FOO ## ConsoleAppender log4j.appender.CA=org.apache.log4j.ConsoleAppender log4j.appender.CA.layout=org.apache.log4j.PatternLayout log4j.appender.CA.layout....

Recursive functions can get quite expensive. If they are pure functions (functions that always return the same value when called with the same arguments, and that neither depend on nor modify external state), they can be made considerably faster at the expense of memory by storing the values already...

There are different variable types for different purposes. In Visual Basic 6 the following variable types are available: Array Boolean Byte Currency Date Double Integer Long Single String Variant You declare a variable by using the Dim keyword: Dim RandomNumber As Integer If you ...