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var sourceFileName = "NonExistingFile"; try { System.IO.File.Copy(sourceFileName, "DestinationFile"); } catch (Exception e) { var stdErr = Console.Error; stdErr.WriteLine($"Failed to copy '{sourceFileName}': {e.Message}"); }

To get the list of Elixir modules just type h Elixir.[TAB] Pressing [TAB] autocompletes modules and functions names. In this case it lists all modules. To find all functions in a module e.g. List use h List.[TAB]

├───models │ ├───user.model.js ├───routes │ ├───user.route.js ├───services │ ├───user.service.js ├───controllers │ ├───user.controller.js For modular code structure the logic should be divided into these directories and files. Models - The schema definition of the Model Rou...

user.model.js var mongoose = require('mongoose') const UserSchema = new mongoose.Schema({ name: String }) const User = mongoose.model('User', UserSchema) module.exports = User; user.routes.js var express = require('express'); var router = express.Router(); var UserController...

If the promise doesn't return anything, the async task can be completed using await. try{ await User.findByIdAndUpdate(user._id, { $push: { tokens: token } }).exec() }catch(e){ handleError(e) }

Valgrind is GPLv2-licensed collection of dynamic analysis tools, which uses binary instrumentation (dynamic recompilation). Six tools are included to detect memory management (Memcheck) and threading errors (Helgrind and DRD), to generate call-graph and profile programs (with optional cache and bran...

One can use the command-line launching facility is when one wants to customize some aspects of the way MySQL Workbench operates. MySQL Workbench has the following common command line options: --admin instance - Launch MySQL Workbench and load the server instance specified. --query connection - ...

Variables inside functions is inside a local scope like this $number = 5 function foo(){ $number = 10 return $number } foo(); //Will print 10 because text defined inside function is a local variable

class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? var firstTabNavigationController : UINavigationController! var secondTabNavigationControoller : UINavigationController! var thirdTabNavigationController : UINavigationController! var fourth...

Use .innerText to set the value Here is a code sample to enter text in Search Box on Bing website private async void EnterTextAsync(string enterText) { var functionString = string.Format(@"document.getElementsByClassName('b_searchbox')[0].innerText = '{0}';", enterText); await...

Use .click() to simulate click Here is a code sample to click search button on Bing website private async void SimulateClickAsync() { var functionString = string.Format(@"document.getElementsByClassName('b_searchboxSubmit')[0].click();"); await webView.InvokeScriptAsync("...

Comparison of access controls of Java against Ruby: If method is declared private in Java, it can only be accessed by other methods within the same class. If a method is declared protected it can be accessed by other classes which exist within the same package as well as by subclasses of the class...

Creating an Snackbar without the need pass view to Snackbar, all layout create in android in android.R.id.content. public class CustomSnackBar { public static final int STATE_ERROR = 0; public static final int STATE_WARNING = 1; public static final int STATE_SUCCESS = 2; publi...

Detailed instructions on getting graph set up or installed.

Detailed instructions on getting odoo-10 set up or installed.

Detailed instructions on getting url set up or installed.

Detailed instructions on getting user-interface set up or installed.

An entity represents an object of a game like a player figure or an enemy figure. Since this object does not do much without arms and legs we can add the components to this. To create this system apple has the GKEntity and GKComponent classes. Lets assume we have the following classe for the follow...

Information about vertex attributes can be retrieved with the OGL function glGetProgram and the parameters GL_ACTIVE_ATTRIBUTES and GL_ACTIVE_ATTRIBUTE_MAX_LENGTH. The location of an active shader attribute can be determined by the OGL function glGetAttribLocation, by the index of the attribute. G...

Information about active uniforms in a program can be retrieved with the OGL function glGetProgram and the parameters GL_ACTIVE_UNIFORMS and GL_ACTIVE_UNIFORM_MAX_LENGTH. The location of an active shader uniform variable can be determined by the OGL function glGetActiveUniform, by the index of the ...