Tutorial by Examples: co

A controlled component is bound to a value and its changes get handled in code using event based callbacks. class CustomForm extends React.Component { constructor() { super(); this.state = { person: { firstName: '', lastName: '' } } } ...

<div *ngFor="let item of items"> <p>{{item.name}}</p> <p>{{item.price}}</p> <p>{{item.description}}</p> </div>

bitcoin.conf The bitcoin.conf file allows customization for your node. Create a new file in a text-editor and save it as bitcoin.conf in your /bitcoin directory. Location of your /bitcoin directory depends on your operation system. Windows XP C:\Documents and Settings\<username>\...

Change Directory Navigate to a directory cd [directory] Example: Changing to the projects directory username$ cd projects Navigate to the root directory (regardless of working directory) cd / Navigate to the parent directory (the directory containing the working directory) cd .. ...

There are already implemented forms within Django to change the user password, one example being SetPasswordForm. There aren't, however, forms to modify the user e-mail and I think the following example is important to understand how to use a form correctly. The following example performs the foll...

As an example, lets us look at a Wordpress container The Dockerfile begins with FROM php:5.6-apache so we go to the Dockerfile abovementioned https://github.com/docker-library/php/blob/master/5.6/apache/Dockerfile and we find FROM debian:jessie So this means that we a security patch appears f...

When displaying labels on contours Matlab doesn't allow you to control the format of the numbers, for example to change to scientific notation. The individual text objects are normal text objects but how you get them is undocumented. You access them from the TextPrims property of the contour handl...

Connecting two child processes via a pipe is performed by connecting each of two children to the parent via different ends of the same pipe. Usually, the parent will not be party to the conversation between the children, so it closes its copies of both pipe ends. int demo() { int pipefds[2]; ...

cURL can keep cookies received in responses for use with subsequent requests. For simple session cookie handling in memory, this is achieved with a single line of code: curl_setopt($ch, CURLOPT_COOKIEFILE, ""); In cases where you are required to keep cookies after the cURL handle is de...

Arrow functions will throw a TypeError when used with the new keyword. const foo = function () { return 'foo'; } const a = new foo(); const bar = () => { return 'bar'; } const b = new bar(); // -> Uncaught TypeError: bar is not a constructor...

Prerequisites This topic is not about Redux and/or Ngrx : You need to be comfortable with Redux At least understand the basics of RxJs and Observable pattern First, let's define an example from the very beginning and play with some code : As a developer, I want to : Have an IUser inter...

To use an in memory cache in your ASP.NET application, add the following dependencies to your project.json file: "Microsoft.Extensions.Caching.Memory": "1.0.0-rc2-final", add the cache service (from Microsoft.Extensions.Caching.Memory) to ConfigureServices method in Startup...

`This way you will get the newest ruby but it has its downsides. Doing it like this ruby will not be managed by any application. !! Remember to chagne the version so it coresponds with your !! you need to download a tarball find a link on an official website (https://www.ruby-lang.org/en/downloa...

Autodoc needs to imports your modules to work. You can include your code path in your conf.py file. For instance: import os sys.path.insert(0, os.path.abspath('../src'))

Create an account Go to https://bitbucket.org/ Click on Get Started on the top right corner Enter your email address, and click continue Enter your full name, password and verification code. Then click Continue An email will be sent to you to verify that you created your account After that...

A simple multiwindow example using signals and slots. There is a MainWindow class that controls the Main Window view. A second window controlled by Website class. The two classes are connected so that when you click a button on the Website window something happens in the MainWindow (a text label i...

Go to the BigCommerce homepage. Enter a store name in the field labeled Create your store name, then click Start my free trial now. Your store name can be changed at any time after starting your trial. Fill out the new trial store form, then click Create my store now. Once yo...

Go to the repository, e.g.: https://bitbucket.org/username/repo_name/ On the left menu, choose commits Select the commit you want to add comments to On the selected files related to that commit, click on the small + sign appearing near the line numbers A small window will appear to enter the ...

var pipeline = {}; // (...) adding things in pipeline for(var key in pipeline) { fs.stat(pipeline[key].path, function(err, stats) { if (err) { // clear that one delete pipeline[key]; return; } // (...) pipeline[key].count++; }); } The problem i...

var pipeline = {}; // (...) adding things in pipeline var processOneFile = function(key) { fs.stat(pipeline[key].path, function(err, stats) { if (err) { // clear that one delete pipeline[key]; return; } // (...) pipeline[key].count++; }); }; ...