Tutorial by Examples: d

Introduction Put simply, these are variables that are available in all scope in your scripts. This means that there is no need to pass them as parameters in your functions, or store them outside a block of code to have them available in different scopes. What's a superglobal?? If you're thinki...

See this example here. import React, { Component } from 'react'; import { Text, View, StyleSheet, Button, Modal } from 'react-native'; import { Constants } from 'expo'; export default class App extends Component { state = { modalVisible: false, }; _handleButtonPress = () =&gt...

Consider next example: public interface A { default void foo() { System.out.println("A.foo"); } } public interface B { default void foo() { System.out.println("B.foo"); } } Here are two interfaces declaring default method foo with the same signature. If you wi...

package main import ( "fmt" "time" log "github.com/Sirupsen/logrus" mgo "gopkg.in/mgo.v2" "gopkg.in/mgo.v2/bson" ) var mongoConn *mgo.Session type MongoDB_Conn struct { Host string `json:"Host"` ...

It is quite easy to call a CGI-Script via GET. First you will need the encoded url of the script. Then you add a question mark ? followed by variables. Every variable should have two sections seperated by =. First section should be always a unique name for each variable, while the second part h...

Using Request Method POST in combination with SSL makes datatransfer more secure. In addition... Most of the encoding and decoding is not needed any more The URL will be visible to any one and needs to be url encoded. The data will be send separately and therefor should be secured via SSL The...

Within the Schema Builder, use the Schema facade with any connection. Run the connection() method to specify which connection to use: Schema::connection('mysql2')->create('some_table', function($table) { $table->increments('id'): });

Similar to Schema Builder, define a connection on the Query Builder: $users = DB::connection('mysql2')->select(...);

When applied on a map, returns a new map with new or updated key val pairs. It can be used to add new information in existing map. (def userData {:name "Bob" :userID 2 :country "US"}) (assoc userData :age 27) ;; { :name "Bob" :userID 2 :country "US&qu...

Python Most commonly used scenario: open page in new window switch to it do something close it switch back to parent window # Open "Google" page in parent window driver.get("https://google.com") driver.title # 'Google' # Get parent window parent_window = driver...

Data can be extracted from a blastdb using blastdbcmd which should be included in a blast installation. You can specify from the options below as part of -outfmt what metadata to include and in what order. From the man page: -outfmt <String> Output format, where the available format sp...

Above example helps us how to turn on SSH on Pi. This example is the prerequisite of above example. For Linux OS: Open the terminal and write down this ssh pi@your local IP address. Then you will need to provide the password. Note: Here pi: your raspberry pi username and your local IP address: th...

public class ExpandBarDynamicContentExample { private final Display display; private final Shell shell; public ExpandBarDynamicContentExample() { display = new Display(); shell = new Shell(display); shell.setLayout(new FillLayout()); // Create...

UPDATE wp_options SET option_value = replace(option_value, 'OLD_SITE, 'NEW_SITE') WHERE option_name = 'home' OR option_name = 'siteurl'; UPDATE wp_posts SET guid = replace(guid, 'OLD_SITE','NEW_SITE'); UPDATE wp_posts SET post_content = replace(post_content, 'OLD_SITE', 'NEW_SITE');

/** * Add meta box to post types. * * @since 1.0.0 */ function myplugin_add_meta_box() { // Set up the default post types/ $types = array( 'post', ); // Optional filter for adding the meta box to more types. Uncomment to use. // $types = apply_filters( 'mypl...

Imagine many users all running a web application that is trying to increment a counter in the database. Each user must read the current count, add one and write out the updated value. To make sure no one reads the counter while someone else is is adding one we use a transaction: ref.transaction(fun...

Every Heroku app runs in at least two environments: on Heroku (we’ll call that production) and on your local machine (development). If more than one person is working on the app, then you’ve got multiple development environments - one per machine, usually. Usually, each developer will also have a te...

Let's start using ExtJS to build a simple web application. We will create a simple web application which will have only one physical page (aspx/html). At a minimum, every ExtJS application will contain one HTML and one JavaScript file—usually index.html and app.js. The file index.html or your defa...

In the previous example, we didn't end up needing the parentheses, because they did not affect the meaning of the statement. However, they are often necessary in more complex expression, like the one below. In C: plus(a, take(b, c)); In Haskell this becomes: (plus a (take b c)) -- or equivale...

Reagent is an interface between ClojureScript and react. It allows you to define efficient React components using nothing but plain ClojureScript functions and data, that describe your UI using a Hiccup-like syntax. Example:- (defn sample-component [] [:div [:p "I am a component!"...