Tutorial by Examples: re

Safe Monkey patching with Refinements

Since Ruby 2.0, Ruby allows to have safer Monkey Patching with refinements. Basically it allows to limit the Monkey Patched code to only apply when it is requested. First we create a refinement in a module: module RefiningString refine String do def reverse "Hell riders" ...

Ruby Language • Monkey Patching in Ruby

MS-DOS, TASM/MASM function to read a 16-bit unsigned integer

Read a 16-bit unsigned integer from input. This function uses the interrupt service Int 21/AH=0Ah for reading a buffered string. The use of a buffered string let the user review what they had typed before passing it to the program for processing. Up to six digits are read (as 65535 = 216 - 1 has ...

Intel x86 Assembly Language & Microarchitecture • Converting decimal strings to integers

Creating a branch in Bitbucket

Go to the repository, e.g.: https://bitbucket.org/username/repo_name/ On the left menu, choose branches On the right side of the branches page, select Create branch A popup window will appear, select Branch from and enter the new branch you want to create in the Branch name textbox Click cre...

bitbucket • Branching in Bitbucket

Bare metal sound

You can also go almost bare-metal when producing sound with java. This code will write raw binary data into the OS audio buffer to generate sound. It's extremely important to understand the limitations and necessary calculations to generating sound like this. Since playback is basically instantaneou...

Java Language • Audio

Correct Writing

JavaScript • How to make iterator usable inside async callback function

Basic Request

Some of the Class properties Ext.Data.Connection PropertiesDetailsurlAddress of the requesttimeoutWaiting time in millisecondssuccessReturn on successfailureReturn on failure Ext.Ajax.on("beforerequest", function(conn , options , eOpts) { console.log("beforerequest"); });...

extjs • ExtJS AJAX

"Resuming" state handling

Your application can be opened by user from "Suspended" state. When doing it "OnResuming" event handler is used. In "App.xaml.cs" class: public App() { this.InitializeComponent(); this.Suspending += OnSuspending; //Handle resuming operat...

uwp • Application Lifecycle

So here are few screen shots from the admin panel using rails_admin gem.

As you can see the layout of this gem is very catching and user friendly.

Ruby on Rails • Add Admin Panel

semi transparency

a green rect (again...) with 4 holes created using 4 greyscale values resulting in 4 different opacities. <svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <mask id="myMask"> &l...

SVG • mask

Filtering Examples, from Simple To More Complex ones

Plain Vanilla Filtering To filter any view, override its get_queryset method to return a filtered query set class HREmployees(generics.ListAPIView): def get_queryset(self): return Employee.objects.filter(department="Human Resources") All the API functions will then use t...

django-rest-framework • Filters

Avoid the $q Deferred Anti-Pattern

Avoid this Anti-Pattern var myDeferred = $q.defer(); $http(config).then(function(res) { myDeferred.resolve(res); }, function(error) { myDeferred.reject(error); }); return myDeferred.promise; There is no need to manufacture a promise with $q.defer as the $http service alread...

AngularJS • Angular promises with $q service

The currentColor keyword

currentColor is most usefull in inline SVGs. With this you can inherit the parents css color and use it everywhere colors are used in SVG. In this example the first circle uses the text color as fill color, and the second circle uses it as the stroke color. <html> <head> ...

SVG • Colors

Reading XML form URL with Retrofit 2

We will use retrofit 2 and SimpleXmlConverter to get xml data from url and parse to Java class. Add dependency to Gradle script: compile 'com.squareup.retrofit2:retrofit:2.1.0' compile 'com.squareup.retrofit2:converter-simplexml:2.1.0' Create interface Also create xml class wrapper in our cas...

Android • Retrofit2

Create configuration in the app/config/config.yml

amazingservice: url: 'http://amazing.com' client_id: 'test_client_1' client_secret: 'test_secret' This is a basic example for create configuration in yml format, for following the yml format you can take deeper configuration.

symfony2 • Configuration for own bundles

Set the config in the created bundle

For instance you have a bundle, which generated by the symfony console. In this case in the DependencyInjection/Configuration.php you have to insert your configuration representation: $treeBuilder = new TreeBuilder(); $rootNode = $treeBuilder->root('amazingservice'); $rootNod...

symfony2 • Configuration for own bundles

Request a merkle block with bitcore-p2p

In this example we will ask the bitcoin network for the merkle block number 442603. In order to do this we need to send a filterload message and then we have to send a getdata message using the inventory type MSG_MERKLEBLOCK. The peers should reply with a merkleblock message for the requested bloc...

bitcoin • Thin Clients

Keyboard short-cut to replace currenlty highlighted word

For example, with following nmap: nmap <expr> <S-F6> ':%s/' . @/ . '//gc<LEFT><LEFT><LEFT>' select a word with *, type Shift-F6, type in a replacement and hit Enter to rename all occurrences interactively.

vim • Substitution

Steps to Move One table of MySQL to another table in postgres:

Click on New Files --> Transformation once a new transformation is open, Click on views tab ,under views create two connections (source ) and (destination). source: table where data is available destination: table where you want to push your data. Once done. on the top bar you have tools -...

kettle • Transfer Data from one Database to another using Kettle (PDI)

ROC-AUC score with overriding and cross validation

One needs the predicted probabilities in order to calculate the ROC-AUC (area under the curve) score. The cross_val_predict uses the predict methods of classifiers. In order to be able to get the ROC-AUC score, one can simply subclass the classifier, overriding the predict method, so that it would a...

scikit-learn • Receiver Operating Characteristic (ROC)

Use tag

We need to use tag <ui:remove> and </ui:remove> between any JSF code that we want to comment it. <ui:remove> <h:outputLabel value="Yeah, I'm really commented" /> </ui:remove> Of course you need add this xmlns to your header html tag. Check this minim...

jsf • Comments in JSF