Tutorial by Examples: g

// This is a MiDI clk generator. This takes a #defined BPM and // makes the appropriate clk rate. The queue is used to let other messages // through, but allows a clock to go immediately to reduce clock jitter #define QUEUE_DEPTH 128 #define BPM 121 #define MIDI_SYSRT_CLK 0xF8 // clock...

Mailbox processors can be used to manage mutable state in a transparent and thread-safe way. Let's build a simple counter. // Increment or decrement by one. type CounterMessage = | Increment | Decrement let createProcessor initialState = MailboxProcessor<CounterMessage>.Sta...

You can use Scan or TryScan methods to look for specific messages in the queue and process them regardless of how many messages are before them. Both methods look at the messages in the queue in the order they arrived and will look for a specified message (up until optional timeout). In case there i...

#!/bin/bash deploy=false uglify=false while (( $# > 1 )); do case $1 in --deploy) deploy="$2";; --uglify) uglify="$2";; *) break; esac; shift 2 done $deploy && echo "will deploy... deploy = $deploy" $uglify && echo "will...

Starting from a sequence of static images (for example called frame01.jpg, frame02.jpg and so on) an animated gif can be created using the following command: magick -delay 10 -loop 0 frame*.jpg animation.gif -delay 10 sets the interval between the frames to 0.1 seconds -loop 0 creates a...

So let's say again that you have the following model: public class Person { public int PersonId { get; set; } public string Name { get; set; } } public class Car { public int CarId { get; set; } public string LicensePlate { get; set; } } public class MyDemoContext : DbContext ...

Mapping one-to-one (when both sides are required) is also a tricky thing. Let's imagine how this could be represented with foreign keys. Again, a CarId in People that refers to CarId in Car, and a PersonId in Car that refers to the PersonId in People. Now what happens if you want to insert a car r...

And to finish off, let's briefly look at the case when both sides are optional. By now you should be really bored with these examples :), so I'm not going into the details and play with the idea of having two FK-s and the potential problems and warn you about the dangers of not enforcing these rule...

const http = require('http') const fs = require('fs') const zlib = require('zlib') http.createServer((request, response) => { const stream = fs.createReadStream('index.html') const acceptsEncoding = request.headers['accept-encoding'] let encoder = { hasEncoder ...

""" CannyTrackbar function allows for a better understanding of the mechanisms behind Canny Edge detection algorithm and rapid prototyping. The example includes basic use case. 2 of the trackbars allow for tuning of the Canny function and the other 2 help with understanding h...

So let's say you have two different entities, something like this: public class Person { public int PersonId { get; set; } public string Name { get; set; } } public class Car { public int CarId { get; set; } public string LicensePlate { get; set; } } public class MyDemoCon...

In the last example, you can see that EF figures out which column is the foreign key and where should it point to. How? By using conventions. Having a property of type Person that is named Person with a PersonId property leads EF to conclude that PersonId is a foreign key, and it points to the prima...

In the previous examples a car cannot exist without a person. What if you wanted the person to be optional from the car side? Well, it's kind of easy, knowing how to do one-to-many. Just change the PersonId in Car to be nullable: public class Car { public int CarId { get; set; } public s...

You might want to rename the fields in the join table to be a little more friendly. You can do this by using the usual configuration methods (again, it doesn't matter which side you do the configuration from): public class CarEntityTypeConfiguration : EntityTypeConfiguration<Car> { publi...

HERE Android Premium SDK samples Now available on Github! [https://github.com/heremaps/here-android-sdk-examples][1] HERE iOS Premium SDK samples Now available on Github! [https://github.com/heremaps/here-ios-sdk-examples][1] Please refer to the README.md on how to get started. Note the samples ...

As an example we want to set all string properties of a sample class class TestClass { val readOnlyProperty: String get() = "Read only!" var readWriteString = "asd" var readWriteInt = 23 var readWriteBackedStringProperty: String = "" ...

Extra goals enable to add processing to DCG clauses, for example, conditions that the elements of the list must satisfy. The extra goals are observed between curly braces at the end of a DCG clause. % DCG clause requiring an integer int --> [X], {integer(X)}. Usage: ?- phrase(int, [3]). t...

The extra arguments add results to predicates of a DCG clause, by decorating the derivation tree. For example, it's possible to create a algebraic grammar that computes the value at the end. Given a grammar that supports the operation addition: % Extra arguments are passed between parenthesis afte...

Let's consider the predicate sumDif/2, verified if the structure of a list matches several constraints. The first term represents the list to analyze and the second term another list that holds the part of the first list that is unknown to our constraints. For the demonstration, sumDif/2 recognizes...

In general, MIDI protocol is broken down into "messages". There are 4 general classes of messages: Channel Voice Channel Mode System Common System Real-Time Messages Messages start with a byte value above 0x80. Any value below 0x7F is considered data. Effectively meaning that 1...