Tutorial by Examples: i

Like patching of classes, you can also patch single objects. The difference is that only that one instance can use the new method. Example: Override a string object to provide parsing to boolean s = 'true' t = 'false' def s.to_b self =~ /true/ ? true : false end >> s.to_b =&...

A very simple example would be to fade out an SKSpriteNode. In Swift: let node = SKSpriteNode(imageNamed: "image") let action = SKAction.fadeOutWithDuration(1.0) node.runAction(action)

Sometimes it is necessary to do an action on repeat or in a sequence. This example will make the node fade in and out a total of 3 times. In Swift: let node = SKSpriteNode(imageNamed: "image") let actionFadeOut = SKAction.fadeOutWithDuration(1.0) let actionFadeIn = SKAction.fadeInWithD...

One helpful case is to have the action run a block of code. In Swift: let node = SKSpriteNode(imageNamed: "image") let actionBlock = SKAction.runBlock({ //Do what you want here if let gameScene = node.scene as? GameScene { gameScene.score += 5 } }) node.runActi...

If you want to use docker for rails app, and use database, you need to know that all the data in the docker container will be destroyed (unless you configure the container specifically for keeping data) Sometimes, you need to create a docker container with an application and attach it to an old con...

Controller: In the Controller you have to add the RequestHandler component. This Enables CakePHP to automatically detect Ajax requests(see: http://book.cakephp.org/2.0/en/core-libraries/components/request-handling.html for more info): class YourController extends AppController { public $compo...

To select an element by an exact HTML attribute use the css locator pattern [attribute=value] //selects the first element with href value '/contact' element(by.css('[href="/contact"]')); //selects the first element with tag option and value 'foo' element(by.css('option[value="f...

To select an element by an HTML attribute that contains a specified value use the css locator pattern [attribute*=value] //selects the first element with href value that contains'cont' element(by.css('[href*="cont"]')); //selects the first element with tag h1 and class attribute that...

Sometimes users from other regions than English-speaking have problems with encoding while for example programming a php project. It can be, that the server has another encoding then UTF-8, and if someone want to create a php project in UTF-8 on this server, his text might be shown incorrect. Examp...

One of most common use cases of Gitflow Initialize repo and define branches $ git flow init # if you use default setup, you'll define six types of branches: # # main branches (lives forever) # # 1. master: for production releases # 2. develop: for "next ...

Let us assume we have the following Series: >>> import pandas as pd >>> s = pd.Series([1, 4, 6, 3, 8, 7, 4, 5]) >>> s 0 1 1 4 2 6 3 3 4 8 5 7 6 4 7 5 dtype: int64 Followings are a few simple things which come handy when you are workin...

Pandas provides an effective way to apply a function to every element of a Series and get a new Series. Let us assume we have the following Series: >>> import pandas as pd >>> s = pd.Series([3, 7, 5, 8, 9, 1, 0, 4]) >>> s 0 3 1 7 2 5 3 8 4 9 5 1 ...

An Analyzer can be applied to a mapping by using "analyzer", by default the "standard" Analyzer is used. Alternatively, if you do not wish to have any analyzer used (because tokenizing or normalization would not be useful) you may specify "index":"not_analyzed&quo...

Sometimes it maybe useful to have multiple distinct indexes of a field with different Analyzers. You can use the multi-fields capability to do so. PUT my_index { "mappings": { "user": { "properties": { "name": { "type...

$rootScope.$on listeners will remain in memory if you navigate to another controller. This will create a memory leak if the controller falls out of scope. Don't angular.module('app').controller('badExampleController', badExample); badExample.$inject = ['$scope', '$rootScope']; function badExam...

<nav class="navbar navbar-default"> <div class="container-fluid"> <div class="navbar-header"> <a class="navbar-brand" href="#"> <img alt="Brand" src="..."> </a> ...

Tomcat's Host Manager application by default is located at http://localhost:8080/host-manager, but is not accessible until a user is given permission in the conf/tomcat-users.xml file. The file needs to have: A manager-gui role A user with this role For example: <tomcat-users> ......

Once you have access to the host-manager, the GUI will let you add a virtual host. Note: In Tomcat 7 and 8, adding a virtual host via the GUI does not write the vhost to config files. You will need to manually edit the server.xml file to have the vhost available after a restart. See http://tomc...

Once a virtual host has been added via the web application, directories will exist at: {CATALINA_HOME}\conf\Catalina\{Name} {CATALINA_HOME}\{App Base} To persist the virtual host after a restart, the server.xml file must be updated with the configuration. A Host element needs to be added inside...

2.04 Bash treats some paths as special and can do some network communication by writing to /dev/{udp|tcp}/host/port. Bash cannot setup a listening server, but can initiate a connection, and for TCP can read the results at least. For example, to send a simple web request one could do: exec 3</...