Tutorial by Examples: me

The following batch file will popup a UAC Prompt allowing you to accept elevated Administrator privileges for the batch session. Add your tasks code to :usercode section of the batch, so they run with elevated privileges. @echo off setlocal EnableDelayedExpansion :: test and acquire admin rights ...

Principal Component Analysis finds sequences of linear combinations of the features. The first linear combination maximizes the variance of the features (subject to a unit constraint). Each of the following linear combinations maximizes the variance of the features in the subspace orthogonal to that...

Standard DateTime Formatting DateTimeForma­tInfo specifies a set of specifiers for simple date and time formating. Every specifier correspond to a particular DateTimeFormatInfo format pattern. //Create datetime DateTime dt = new DateTime(2016,08,01,18,50,23,230); var t = String.Format("{0...

Any nullable type is a generic type. And any nullable type is a value type. There are some tricks which allow to effectively use the result of the Nullable.GetUnderlyingType method when creating code related to reflection/code-generation purposes: public static class TypesHelper { public stat...

public class Producer { private static Random random = new Random((int)DateTime.UtcNow.Ticks); //produce the value that will be posted to buffer block public double Produce ( ) { var value = random.NextDouble(); Console.WriteLine($"Producing value: {value}...

As far as client-side JavaScript engines are concerned (those running inside a browser), there is no straightforward solution available for requesting content from sources other than the current domain. (By the way, this limitation does not exist in JavaScript-server tools such as Node JS.) However...

This is a relatively common mistake: You created an rect element, in a bar chart for instance, and you want to add a text label (let's say, the value of that bar). So, using the same variable that you used to append the rect and define its x and y position, you append your text element. Very logic, ...

Writing and managing ADO.Net code for data access is a tedious and monotonous job. Microsoft has provided an O/RM framework called "Entity Framework" to automate database related activities for your application. Entity framework is an Object/Relational Mapping (O/RM) framework. It is an e...

The IEnumerable<T> interface is the base interface for all generic enumerators and is a quintessential part of understanding LINQ. At its core, it represents the sequence. This underlying interface is inherited by all of the generic collections, such as Collection<T>, Array, List<T&g...

1. Switch to a frame by Index. Here we are switching to index 1. Index refers to the order of frames on the page. This should be used as a last resort, as frame id or names are much more reliable. driver.SwitchTo().Frame(1); 2. Switch to a frame by Name driver.SwitchTo().Frame("Name_Of_Fr...

To assign a value to a previously declared variable, use the assignment operator, =: a = 6; b = "Foo"; As an alternative to independent declaration and assignment, it is possible to perform both steps in one statement: var a = 6; let b = "Foo"; It is in this syntax that...

Sometimes we need to accept route params as well as access the HTTP Request params. We can still type hint the Requests class in laravel controller and achieve that as explained below E.g. We have a route that update a certain post like this (passing post id i route ) Route::put('post/{id}', 'Post...

In C, multi-line comments, /* and */, do not nest. If you annotate a block of code or function using this style of comment: /* * max(): Finds the largest integer in an array and returns it. * If the array length is less than 1, the result is undefined. * arr: The array of integers to search....

A defer statement consists of a block of code, which will be executed when a function returns and should be used for cleanup. As Swift's guard statements encourage a style of early return, many possible paths for a return may exist. A defer statement provides cleanup code, which then does not need ...

When using a defer-statement, make sure the code remains readable and the execution order remains clear. For example, the following use of the defer-statement makes the execution order and the function of the code hard to comprehend. postfix func ++ (inout value: Int) -> Int { defer { value...

This is a TCP daytime iterative server kept as simple as possible. #include <sys/types.h> /* predefined types */ #include <unistd.h> /* unix standard library */ #include <arpa/inet.h> /* IP addresses conversion utilities */ #include <netinet/in.h> /* sockaddr...

To check if a method was called on a mocked object you can use the Mockito.verify method: Mockito.verify(someMock).bla(); In this example, we assert that the method bla was called on the someMock mock object. You can also check if a method was called with certain parameters: Mockito.verify(som...

In IDE Jaspersoft Studio (JSS) or the older version iReport Designer it is sufficient to press Preview. The JasperReports design file .jrxml will automatically be compiled to .jasper in same folder as .jrxml if no errors are present. Another way is to press "Compile Report" button in JSS...

Multidimensional Arrays As the name indicates, multi dimensional arrays are arrays that contain more than one dimension, usually two or three but it can have up to 32 dimensions. A multi array works like a matrix with various levels, take in example a comparison between one, two, and three Dimensi...

NSLog(@"%s %d %s, yourVariable: %@", __FILE__, __LINE__, __PRETTY_FUNCTION__, yourVariable); Will log the file, line number and function data along with any variables you want to log. This can make the log lines much longer, particularly with verbose file and method names, however it ca...