Tutorial by Examples: io

The window.postMessage() method together with its relative event handler window.onmessage can be safely used to enable cross-origin communication. The postMessage() method of the target window can be called to send a message to another window, which will be able to intercept it with its onmessage e...

Service that is used for communication: import { Injectable } from '@angular/core'; import { Subject } from 'rxjs/Subject'; @Injectable() export class ComponentCommunicationService { private componentChangeSource = new Subject(); private newDateCreationSource = new Subject<Date&...

The following function adds four threads. Three threads compete for the semaphore, which is set to a count of one. A slower thread calls notify_one(), allowing one of the waiting threads to proceed. The result is that s1 immediately starts spinning, causing the Semaphore's usage count to remain be...

public static FontFamily GetResourceFontFamily(byte[] fontbytes) { PrivateFontCollection pfc = new PrivateFontCollection(); IntPtr fontMemPointer = Marshal.AllocCoTaskMem(fontbytes.Length); Marshal.Copy(fontbytes, 0, fontMemPointer, fontbytes.Length); pfc.AddMemoryFont(fontMemPo...

Coercion happens with data types in R, often implicitly, so that the data can accommodate all the values. For example, x = 1:3 x [1] 1 2 3 typeof(x) #[1] "integer" x[2] = "hi" x #[1] "1" "hi" "3" typeof(x) #[1] "character" ...

Use top command to exam CPU time allocation between user space and kernel space. Explanation: 24.8 us (user space): 24.8% of CPU time is spent on user process. 0.5 sy (system): 0.5% of CPU time is spent on kernel space. ni (niceness): the ratio of CPU time spent on low priority processes. i...

Different procedures can give out the same result, but they would use different processing time. In order to check out which one is faster, a code like this can be used: time1 = Timer For Each iCell In MyRange iCell = "text" Next iCell time2 = Timer For i = 1 To 30 MyRan...

You can define the signing configuration to sign the apk in the build.gradle file. You can define: storeFile : the keystore file storePassword: the keystore password keyAlias: a key alias name keyPassword: A key alias password You have to define the signingConfigs block to create a signin...

Instead of this (unfortunately too often seen in the real code) "masterpiece": function isEven(n) { return n % 2 == 0; } function isOdd(n) { if (isEven(n)) { return false; } else { return true; } } You can do the parity check much more effecti...

var a = 11, b = 22; a = a ^ b; b = a ^ b; a = a ^ b; console.log("a = " + a + "; b = " + b);// a is now 22 and b is now 11

The Roslyn Quoter A tool for converting an sample C# program to syntax tree API calls. The tool itself can be found here. Enhanced source viewer An easy way to view the Roslyn source code can be found here.

Detailed instructions on getting caliburn.micro set up or installed.

This is especially useful if we have a class that we want to extend in the rule. See example below for a more convenient method. import org.junit.rules.TestRule; import org.junit.runners.model.Statement; public class AwesomeTestRule implements TextRule { @Override public Stateme...

JUnit has an abstract implementation of @TestRule that lets you write a rule in a more simpler way. This is called ExternalResource and provides two protected methods that can be extended like this: public class AwesomeTestRule extends ExternalResource { @Override protected void befor...

In certain cases (e.g. logging) it might be useful to run task and do not await for the result. The following extension allows to run task and continue execution of the rest code: public static class TaskExtensions { public static async void RunAndForget( this Task task, Action<E...

To find your existing .cs files, right click on the project in your instance of Visual Studio, and click Open Folder in File Explorer. Visual Studio --> Your current project (Windows Form) --> Solution Explorer --> Project Name --> Right Click --> Add --> Existing Item --> ...

Detailed instructions on getting linked-list set up or installed.

Step1 Message Flow: [![enter image description here][1]][1] Step 2: Databse Connector Configuration For this you need mysql-connector-java-5.1.40-bin.jar . Right click on Project -->build Path--> Add external archieve and add the jar(without jar it cannot be connected) Enter all the value...

class Monad m where return :: a -> m a (>>=) :: m a -> (a -> m b) -> m b The most important function for dealing with monads is the bind operator >>=: (>>=) :: m a -> (a -> m b) -> m b Think of m a as "an action with an a result". ...

Stack corruptions are annoying bugs to look at. As the stack is corrupted, the debugger often can't give you a good stack trace of where you are and how you got there. This is where safe-stack comes into play. Instead of using a single stack for your threads, it will use two: A safe stack and a dan...