Tutorial by Examples: an

Executing Basic Get/Set Commands

Once you have established a connection to Redis you can get and set values using the Jedis connection object: Get String value = jedis.get(myKey); Set jedis.put(myKey, "some value");

Advanced Type Constraints

It's possible to specify several type constraints for generics using the where clause: func doSomething<T where T: Comparable, T: Hashable>(first: T, second: T) { // Access hashable function guard first.hashValue == second.hashValue else { return } // Access compa...

Switching specific events on and off via jQuery. (Named Listeners)

Sometimes you want to switch off all previously registered listeners. //Adding a normal click handler $(document).on("click",function(){ console.log("Document Clicked 1") }); //Adding another click handler $(document).on("click",function(){ console.log(&q...

Installing and running Redis Server on Windows

Note: The Redis project does not officially support Windows. However, the Microsoft Open Tech group develops and maintains this Windows port targeting Win64. Official redis.io/download You can choose to download different versions or the latest version of Redis github.com/MSOpenTech/redis/release...

Color changes

<!doctype html> <html> <head> <title>Page Title</title> <meta charset="UTF-8"> <meta name="viewport" content="initial-scale=1.0"> <script src="vue.js"></script> <style> ...

Splitting panes

To split pane vertically, do a prefix followed by % ie, by default ctrlb followed by % To split pane horizontally, do a prefix followed by " ie, by default ctrlb followed by "

Moving between panes

To move between panes, follow prefix with movement keys ie, ctrlb followed by corresponding arrow keys                        ▲ ctrlb ◀        ▶                        ▼

Change prefix

The default configuration <C-b> is not the easiest to use. It'd be better to use something like ctrla. To do so, add this to tmux.conf # remap prefix from 'C-b' to 'C-a' unbind C-b set-option -g prefix C-a bind-key C-a send-prefix

GraphQL Query Language (GQL)

Instead of defining URL endpoints for each data resource, in GraphQL you define a single endpoint that accepts GraphQL queries. Unlike traditional database query languages, GraphQL Query Language (GQL) is a projection of data returned by a root level query. The GraphQL schema will define the data mo...

Query Document - Using AND, OR and IN Conditions

All documents from students collection. > db.students.find().pretty(); { "_id" : ObjectId("58f29a694117d1b7af126dca"), "studentNo" : 1, "firstName" : "Prosen", "lastName" : "Ghosh", "age" ...

async.series(To handle events one by one)

/In async.series,all the functions are executed in series and the consolidated outputs of each function is passed to the final callback. e.g/ var async = require('async'); async.series([ function (callback) { console.log('First Execute..'); callback(null, 'userPersonalData'); }, function (cal...

Creating an event listener

To register your methods, the class containing the EventHandler(s) must implement the Listener interface. import org.bukkit.event.Listener; public final class ListenerClass implements Listener { } You need to register the event listener by adding the following call to your onEnable method in...

Creating an event listener in Forge

Creating an event listener in Forge is very similar to creating one in Bukket. Creating the listener class requires a lot less. There's no interface to implement or other imports. public class ListenerClass { } //perfectly valid event listener class Registering it requires passing the instance ...

Chaining messages with andThen

The andThen function allows update call composition. Can be used with the pipeline operator (|>) to chain updates. Example: You are making a document editor, and you want that each modification message you send to your document, you also save it: import Update.Extra exposing (andThen) import U...

EventHandler Parameters

The org.bukkit.event.EventHandler annotation accepts a couple parameters. priority - Indicates the priority of your listener. There are the six different priorities, in order of execution: LOWEST,LOW,NORMAL[default],HIGH,HIGHEST,MONITOR. These constants refer to the org.bukkit.event.EventPriority e...

Transmit large amount of data using DMA and interrupts - HAL library

In this example 2000 bytes will be transfered using DMA, Transmit Half Complete and Transmit Complete interrupts achieving the best performance. The first half of the transmit buffer is loaded with new data by the CPU in the Transmit Half Complete interrupt callback while the second half of the buf...

Bit Manipulation Application: Small to Capital Letter

One of several applications of bit manipulation is converting a letter from small to capital or vice versa by choosing a mask and a proper bit operation. For example, the a letter has this binary representation 01(1)00001 while its capital counterpart has 01(0)00001. They differ solely in the bit in...

Define custom exception, raise it and see where it comes from

To illustrate this, here is a function that has 3 different "wrong" behaviors the parameter is completely stupid: we use a user-defined expression the parameter has a typo: we use Oracle standard NO_DATA_FOUND error another, but not handled case Feel free to adapt it to your standa...

Handling connexion error exceptions

Each standard Oracle error is associated with an error number. It's important to anticipate what could go wrong in your code. Here for a connection to another database, it can be: -28000 account is locked -28001 password expired -28002 grace period -1017 wrong user / password Here is a way ...

Instantiating a ListObject

Dim lo as ListObject Dim MyRange as Range Set lo = Sheet1.ListObjects(1) 'or Set lo = Sheet1.ListObjects("Table1") 'or Set lo = MyRange.ListObject

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