Tutorial by Examples: e

Generating Dictionary From IEnumerable

' Just setting up the example Public Class A Public Property ID as integer Public Property Name as string Public Property OtherValue as Object End Class Public Sub Example() 'Setup the list of items Dim originalList As New List(Of A) originalList.Add(New A() With {...

Visual Basic .NET Language • LINQ

Saving a buffer in a non-existent dir

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

vim • Saving

Simple setup

Setting up the folders This example assumes code to be in src/ and the output to be put into out/. As such the folder structure should look something like example/ |-- src/ | |-- index.js | `-- ... |-- out/ `-- package.json Setting up the packages Assuming a setup npm environment, we...

React • Installation

Using webpack-dev-server

Setup After setting up a simple project to use webpack, babel and react issuing $npm i -g webpack-dev-server will install the development http server for quicker development. Modifying webpack.config.js var path = require('path'); module.exports = { entry: './src/index.js', output: { ...

React • Installation

Create a pygame window

This creates a window in fullscreen with size 500x500 pixels: pygame.init() screen = pygame.display.set_mode((500, 500), pygame.FULLSCREEN) screen represents from now on the window on screen; it is a pygame.Surface object. Anything that should be come visible to the user has to be drawn onto it...

pygame • Creating a window in pygame - pygame.display.set_mode()

Hello World Firebase Realtime Database in Node

System Requirements: Node JS Getting Started First Go to Firebase Console and Create New Project. After Creating the project, in project click on settings icon besides project Name in left sidebar and select Permissions. On Permissions Page Click on Service accounts in left sidebar then c...

firebase • Using Firebase with Node

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

VARIANCE

Variance measures how far a set numbers is spread out from it's mean. From practical perspective it is squared distance from its mean (center) - the bigger the number the farther the point is. The following example would return variance of salary values SELECT name, salary, VARIANCE(salary) "...

Oracle Database • Statistical functions

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

Text Boxes and Labels

Text box controls are typically used to accept input from the user. A text box control can accept one or more lines of text depending upon the settings of the TextMode attribute. Label controls provide an easy way to display text which can be changed from one execution of a page to the next. If you...