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Dotted syntax for pairs

There is a particular syntax that allow us to write cons cell in a more compact way than using the cons constructor. A pair can be written as such: '(1 . 2) == (cons 1 2) The big difference is that we can create pairs using quote. Otherwise, Scheme would create a proper list (1 . (2 . '())). T...

VectorDrawable Usage Example

Here’s an example vector asset which we’re actually using in AppCompat: res/drawable/ic_search.xml <vector xmlns:android="..." android:width="24dp" android:height="24dp" android:viewportWidth="24.0" android:viewportHeig...

VectorDrawable xml example

Here is a simple VectorDrawable in this vectordrawable.xml file. <vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="64dp" android:width="64dp" android:viewportHeight="600" android:viewportWidth=&quot...

SQL Server 2012/2014 using ORDER BY OFFSET and FETCH NEXT

For getting the next 10 rows just run this query: SELECT * FROM TableName ORDER BY id OFFSET 10 ROWS FETCH NEXT 10 ROWS ONLY; Key points to consider when using it: ORDER BY is mandatory to use OFFSET and FETCH clause. OFFSET clause is mandatory with FETCH. You can never use, ORDER BY … FETC...

Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM

Appearance: "Paamayim Nekudotayim" means "double colon" in Hebrew; thus this error refers to the inappropriate use of the double colon operator (::). The error is typically caused by an attempt to call a static method that is, in fact, not static. Possible Solution: $classname...

Example

Grammar Example (Expr.g4) grammar Expr; prog: (expr NEWLINE)* ; expr: expr ('*'|'/') expr | expr ('+'|'-') expr | INT | '(' expr ')' ; NEWLINE : [\r\n]+ ; INT : [0-9]+ ; Generating the visitor To generate a Visitor, or to disable a visitor for your ...

SQLExample

For querying all the data from table MachineName we can use the command like below one. $Query="Select * from MachineName" $Inst="ServerInstance" $DbName="DatabaseName $UID="User ID" $Password="Password" Invoke-Sqlcmd2 -Serverinstance $Inst -Databa...

Text alignment and word wrap

//make column H wider and set the text align to the top and right worksheet.Column(8).Width = 25; worksheet.Column(8).Style.HorizontalAlignment = ExcelHorizontalAlignment.Right; worksheet.Column(8).Style.VerticalAlignment = ExcelVerticalAlignment.Top; //wrap text in the cells worksheet.Column...

Complete example with all styles

//create a new ExcelPackage using (ExcelPackage excelPackage = new ExcelPackage()) { //create the WorkSheet ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1"); //add some dummy data, note that row and column indexes start at 1 for (int i = 1;...

Complete example with formulas

//create a new ExcelPackage using (ExcelPackage excelPackage = new ExcelPackage()) { //create 2 WorkSheets ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1"); ExcelWorksheet worksheet2 = excelPackage.Workbook.Worksheets.Add("Sheet 2"); ...

Check if key Exists in Dictionary

If oDic.Exists("US") Then msgbox "The Key US Exist. The value is " + oDic("US") Else msgbox "Key Does not exist." End If

Example

ASPX <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt...

Example

<script language="VB" runat="server"> Sub SubmitBtn_Click(sender As Object, e As EventArgs) Label1.Text = "Text1.Text = " & Text1.Text End Sub </script> <h3><font face="Verdana">TextBox Sample</...

Example

Basic KatanaConsole Application namespace KatanaConsole { // use an alias for the OWIN AppFunc: using AppFunc = Func<IDictionary<string, object>, Task>; class Program { static void Main(string[] args) { WebApp.Start<Startup>(&...

Expression Basics

Expressions in Java are the primary construct for doing calculations. Here are some examples: 1 // A simple literal is an expression 1 + 2 // A simple expression that adds two numbers (i + j) / k // An expression with multiple operations (flag) ? c : d // An...

Import existing repository to Bitbucket

Go to the repository you want to clone (something like: https://bitbucket.org/username/repo) On the top menu, choose Repository -> Import repository In the Old repository section, enter the source (CodePlex, Git, Google Code, Mercurial, Source Code, Subversion) and the URL In the New reposi...

Global Exception Handling in ASP.NET Core

UseExceptionHandler can be used to handle exceptions globally. You can get all the details of exception object like Stack Trace, Inner exception and others. And then you can show them on screen. You can easily implement like this. app.UseExceptionHandler( options => { options.Run( as...

Example: Consider will have two threads T1 and T2.

How do you detect them? If the same variable/resource/memory location is accessible by multiple threads and at least of the thread is changing the value of variable/resource/memory location, then Race Condition can occurred. Because if a thread is changing the value of variable/resource/memory ...

Hide strange unwanted and extra Xcode 8 logs.

From Xcode menu open: Product > Scheme > Edit Scheme. On your Environment Variables set OS_ACTIVITY_MODE = disable

Misusing GROUP BY with SELECT *, and how to fix it.

Sometimes a query looks like this, with a * in the SELECT clause. SELECT item.*, /* nonstandard */ COUNT(*) number_of_uses FROM item JOIN uses ON item.item_id, uses.item_id GROUP BY item.item_id Such a query needs to be refactored to comply with the ONLY_FULL_GROUP_BY sta...

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