Tutorial by Examples: u

For larger command line programs, using std::env::args() is quite tedious and difficult to manage. You can use clap to handle your command line interface, which will parse arguments, generate help displays and avoid bugs. There are several patterns that you can use with clap, and each one provides ...

Jersey (2) uses HK2 as its dependency injection (DI) system. We can use other injection systems, but its infrastructure is built with HK2, and allows us to also use it within our applications. Setting up simple dependency injection with Jersey takes just a few lines of code. Let say for example we ...

Say you have a Parent class and a Child class. To construct a Child instance always requires some Parent constructor to be run at the very gebinning of the Child constructor. We can select the Parent constructor we want by explicitly calling super(...) with the appropriate arguments as our first Chi...

This is same as reading a manual for a command: man /path/to/man/file

Simple way to share a message or link, copy text to clipboard, or open a browser in any Xamarin or Windows app. Available on NuGet : https://www.nuget.org/packages/Plugin.Share/ XAML <StackLayout Padding="20" Spacing="20"> <Button StyleId="Text" Text...

You shouldn't throw raw values as exceptions, instead use one of the standard exception classes or make your own. Having your own exception class inherited from std::exception is a good way to go about it. Here's a custom exception class which directly inherits from std::exception: #include <ex...

Why annotations? Generally we use annotation to facilitate the development and to make the code more clear and clean. What are annotations? Java 5 annotations provide standardization of metadata in a general goal. This metadata associated with Java features can be exploited in the compilation or ...

This example uses Angular 2.0.0 Final Release registration-form.component.ts import { FormGroup, FormControl, FormBuilder, Validators } from '@angular/forms'; @Component({ templateUrl: "./registration-form.html" }) export class ExampleComponent { ...

The pandas.DataFrame.apply() method is used to apply a given function to an entire DataFrame --- for example, computing the square root of every entry of a given DataFrame or summing across each row of a DataFrame to return a Series. The below is a basic example of usage of this function: # create...

You should have a plain CMake project myproject, and we are going to make an Eclipse workspace outside of it: myproject/ .git/ CMakeLists.txt src/ main.cpp workspace/ myproject/ Release/ Debug/ Qt (optional) Get latest Eclipse ...

When you need to find the bounding rectangle of a quadratic bezier curve you can use the following performant method. // This method was discovered by Blindman67 and solves by first normalising the control point thereby reducing the algorithm complexity // x1,y1, x2,y2, x3,y3 Start, Control, and ...

A CSV file itself requires no installation as it is just a plain text file, usually with .csv extension. A CSV file usually contains records. Each line represents one record and is separated by a delimiter, most commonly a comma; but semicolons and tabs are also frequently used. Each line should ha...

All communications between Fragments must go via an Activity. Fragments CANNOT communicate with each other without an Activity. Additional Resources How to implement OnFragmentInteractionListener Android | Communicating With Other Fragments In this sample, we have a MainActivity that hosts t...

If you have an elixir file; a script or a module and want to load it into the current IEx session, you can use the c/1 method: iex(1)> c "lib/utils.ex" iex(2)> Utils.some_method This will compile and load the module in IEx, and you'll be able to call all of it's public methods. ...

Add react-rails to your Gemfile: gem 'react-rails' And install: bundle install Next, run the installation script: rails g react:install This will: create a components.js manifest file and a app/assets/javascripts/components/ directory, where you will put your components place the follo...

React.js builds You can pick which React.js build (development, production, with or without add-ons) to serve in each environment by adding a config. Here are the defaults: # config/environments/development.rb MyApp::Application.configure do config.react.variant = :development end # conf...

react-rails includes a view helper (react_component) and an unobtrusive JavaScript driver (react_ujs) which work together to put React components on the page. You should require the UJS driver in your manifest after react (and after turbolinks if you use Turbolinks). The view helper puts a div on t...

What is Profiling? By definition Profiling is a form of dynamic program analysis that measures, for example, the space (memory) or time complexity of a program, the usage of particular instructions, or the frequency and duration of function calls. Why is it necessary? Profiling is important becau...

It is not a good idea to expose Option types to C# code, as C# does not have a way to handle them. The options are either to introduce FSharp.Core as a dependency in your C# project (which is what you'd have to do if you're consuming an F# library not designed for interop with C#), or to change None...

// If you find yourself doing something like this... function fieldChanged(type, name, index) { if (name == 'salesrep') { var salesRepId = nlapiGetFieldValue('salesrep'); var salesRepEmail = nlapiLookupField('employee', salesRepId, 'email'); nlapiSetFieldValue('custb...