Tutorial by Examples: et

Simple example to Connect mongoDB from Node.JS

MongoClient.connect('mongodb://localhost:27017/myNewDB',function (err,db) { if(err) console.log("Unable to connect DB. Error: " + err) else console.log('Connected to DB'); db.close(); }); myNewDB is DB name, if it does not exists in database then it...

Node.js • Connect to Mongodb

Displaying something for authenticated users only

<div sec:authorize="isAuthenticated()"> This text is displayed for authenticated users. </div>

thymeleaf • Spring Security and Thymeleaf

find() method with Projection

The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to show all documents without the age field then the command is as follows db.people.find({},{age : 0}); If you want to show all documents the age field then the command is a...

MongoDB • Querying for Data ( Getting Started )

Find() method with Projection

In MongoDB, projection means selecting only the necessary data rather than selecting whole of the data of a document. The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to to show all document without the age field then the comm...

MongoDB • Querying for Data ( Getting Started )

Installation or Setup

Detailed instructions on getting optimization set up or installed.

optimization • Getting started with optimization

Getting int From Entry Widget

When using the .get() method whatever is in the entry widget will be converted into a string. For example, regardless of the type of input(It can be a number or sentence), the resulting outcome will be a string. If the user types 4 the output will be "4" as in a string. To get an int from ...

tkinter • The Tkinter Entry Widget

Custom Helper - Date Time Picker

public static MvcHtmlString DatePickerFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object htmlAttributes) { var sb = new StringBuilder(); var metaData = ModelMetadata.FromLambdaExpression(expression, htm...

asp.net-mvc • Html Helpers

EventHandler Parameters

The org.bukkit.event.EventHandler annotation accepts a couple parameters. priority - Indicates the priority of your listener. There are the six different priorities, in order of execution: LOWEST,LOW,NORMAL[default],HIGH,HIGHEST,MONITOR. These constants refer to the org.bukkit.event.EventPriority e...

minecraft • Event Listeners in Bukkit

Installation or Setup

In order to install asyncio: pip install asyncio Notice that python asyncio requires Python 3.3 or later. This module became part of the Python standard library since Python 3.4.

python-asyncio • Getting started with python-asyncio

Getting the Scope of element

In an angular app everything goes around scope, if we could get an elements scope then it is easy to debug the angular app. How to access the scope of element: angular.element(myDomElement).scope(); e.g. angular.element(document.getElementById('yourElementId')).scope() //accessing by ID Gett...

AngularJS • Debugging

Bit Manipulation Application: Small to Capital Letter

One of several applications of bit manipulation is converting a letter from small to capital or vice versa by choosing a mask and a proper bit operation. For example, the a letter has this binary representation 01(1)00001 while its capital counterpart has 01(0)00001. They differ solely in the bit in...

C++ • Bit Manipulation

Installation or Setup

Create a file called hello.html with the following content: <!doctype html> <html> <head> <script src="//cdnjs.cloudflare.com/ajax/libs/dygraph/2.0.0/dygraph.js"></script> <link rel="stylesheet" href="https://cdnjs.cloudflare.com...

dygraphs • Getting started with dygraphs

Converting an Excel Table to a normal range

Dim lo as ListObject Set lo = Sheet1.ListObjects("Table1") lo.Unlist

excel-vba • Working with Excel Tables in VBA

Creating an AdhocWorkspace and adding a new project and a file to it.

The idea behind the AdhocWorkspace is to create a workspace on the fly. var workspace = new AdhocWorkspace(); string projectName = "HelloWorldProject"; ProjectId projectId = ProjectId.CreateNewId(); VersionStamp versionStamp = VersionStamp.Create(); ProjectInfo helloWorldProject = P...

roslyn • Using Workspaces

Creating an MSBuildWorspace, loading a solution and getting all the documents in all that solution

The MSBuildWorspace is built around the concept of handling MSBuild solutions (.sln files) and their respective projects (.csproj, .vbproj). Adding new projects and documents to this workspace is not supported. string solutionPath = @"C:\Path\To\Solution\Sample.sln"; MSBuildWorkspace ...

roslyn • Using Workspaces

Getting the VisualStudioWorkspace from inside a Visual Studio Extension

In contrast to the other types of workspaces, the VisualStudioWorkspace, cannot be created manually. It can be accessed when building a Visual Studio extension. When inside your extension package project, go to [YourVSPackage]Package.cs file. There you can acquire the workspace in two ways: protec...

roslyn • Using Workspaces

Getting the Syntax Tree Root from a Document.

If you already have access to your Document class from your workspace (Using Workspaces) it is easy to access the root of your Syntax tree. Document document = ... // Get document from workspace or other source var syntaxRoot = await document.GetSyntaxRootAsync();

roslyn • Syntax Tree

Example of a generic method that rotates an array by a given shift

I would like to point out that we rotate left when the shifting value is negative and we rotate right when the value is positive. public static void Main() { int[] array = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; int shiftCount = 1; Rotate(ref array, shiftCount); ...

C# Language • O(n) Algorithm for circular rotation of an array

Getting the Semantic Model

There qutie a fiew ways to get the sematic model. From a Document class Document document = ...; SemanticModel semanticModel = await document.GetSemanticModelAsync(); From a Compilationclass CSharpCompilation compilation = ...; var semanticModel = await compilation.GetSemanticModel...

roslyn • Semantic Model

Get all the references to a method

var syntaxRoot = await document.GetSyntaxRootAsync(); var semanticModel = await document.GetSemanticModelAsync(); var sampleMethodInvocation = syntaxRoot .DescendantNodes() .OfType<InvocationExpressionSyntax>() .First(); var sampleMethodSymbol = semanticModel.GetSymbolI...

roslyn • Semantic Model