Tutorial by Examples: ai

Route constraints let you restrict how the parameters in the route template are matched. The general syntax is {parameter:constraint}. For example: // eg: /users/5 [Route(“users/{id:int}”] public ActionResult GetUserById(int id) { … } // eg: users/ken [Route(“users/{name}”] public ActionRes...

Logs are very important. Recreate an error context can be sometimes very painful due to the lack of information about how and when the error occurred. This example shows: How to add user's data in the error logs How to add post parameters sent when an error occurred How to use WebPr...

In order to use a plain-text editor to create a Console application that is written in C#, you'll need the C# Compiler. The C# Compiler (csc.exe), can be found at the following location: %WINDIR%\Microsoft.NET\Framework64\v4.0.30319\csc.exe N.B. Depending upon which version of the .NET Framework t...

docker logs --follow <containerid> This tails the output of the running container. This is useful if you did not set up a logging driver on the docker daemon.

There are a number of available routing verbs in Sinatra, they correspond directly to http verbs get '/' do .. get some data, a view, json, etc .. end post '/' do .. create a resource .. end put '/' do .. replace a resource .. end patch '/' do .. change a resource .. end ...

If you want to make a change that you want to merge with master, the best way is to first create a topic branch git checkout -b foo make a single commit with your feature git commit -m "Made the thing X finally work" and push that branch to review via git push origin foo:refs/for/...

autodie allows you to work with files without having to explicitly check for open/close failures. Since Perl 5.10.1, the autodie pragma has been available in core Perl. When used, Perl will automatically check for errors when opening and closing files. Here is an example in which all of the lines ...

Let's say that you have exam scores for several exams and you want to divide them into quartiles per exam. -- Setup data: declare @values table(Id int identity(1,1) primary key, [Value] float, ExamId int) insert into @values ([Value], ExamId) values (65, 1), (40, 1), (99, 1), (100, 1), (90, 1), ...

If you are using UIViewControllerContainment there are a few other methods that are worth looking at. When you want a child viewController to control the presentation of the status bar (i.e. if the child is positioned at the top of the screen in Swift class RootViewController: UIViewController { ...

/** *@NApiVersion 2.x *@NScriptType Suitelet */ define([],function() { // NetSuite's AMD pattern function onRequest_entry(context) { // Suitelet entry function receives a context obj context.response.write('Hello World'); // Write a response using the context obj } retu...

In Rust, there is no concept of "inheriting" the properties of a struct. Instead, when you are designing the relationship between objects do it in a way that one's functionality is defined by an interface (a trait in Rust). This promotes composition over inheritance, which is considered mo...

Every Keychain Item is most often represented as a CFDictionary. You can, however, simply use NSDictionary in Objective-C and take advantage of bridging, or in Swift you may use Dictionary and explicitly cast to CFDictionary. You could construct a password with the following dictionary: Swift var...

To construct a query, we need to represent it as a CFDictionary. You may also use NSDictionary in Objective-C or Dictionary in Swift and cast to CFDictionary. We need a class key: Swift var dict = [String : AnyObject]() dict[kSecClass as String] = kSecClassGenericPassword Next, we can specify...

As usual, we first need a CFDictionary to represent the item we want to update. This must contain all of the old values for the item, including the old private data. Then it takes a CFDictionary of any attributes or the data itself that you would like to change. So first, let's construct a class ke...

We need only one thing in order to delete an item from the Keychain: a CFDictionary with attributes describing the items to be deleted. Any items that match the query dictionary will be deleted permanently, so if you are only intending to delete a single item be sure to be specific with your query. ...

dispatch_group_t preapreWaitingGroup = dispatch_group_create(); dispatch_group_enter(preapreWaitingGroup); [self doAsynchronousTaskWithComplete:^(id someResults, NSError *error) { // Notify that this task has been completed. dispatch_group_leave(preapreWaitingGroup); }] dispatch...

A NullReferenceException is thrown when you try to access a non-static member (property, method, field or event) of a reference object but it is null. Car myFirstCar = new Car(); Car mySecondCar = null; Color myFirstColor = myFirstCar.Color; // No problem as myFirstCar exists / is not null Color...

Problem statement: Find the minimum (over x, y) of the function f(x,y), subject to g(x,y)=0, where f(x,y) = 2 * x**2 + 3 * y**2 and g(x,y) = x**2 + y**2 - 4. Solution: We will solve this problem by performing the following steps: Specify the Lagrangian function for the problem Determine the K...

url: /api/data/v8.0/quotedetails json: { "[email protected]": "/products(11c0dbad-91df-e311-b8e5-6c3be5a8b200)", "[email protected]" : "/quotes(69b5e1ae-037f-e611-80ed-fc15b428dcdc)", "[email protected]" : "/uoms(73a5daea-6dd...

Samtools can be used to convert between sam and bam: -b indicates that the input file will be in BAM format -S indicates that the stdout should be in SAM format samtools view -sB thing.bam > thing.sam And to convert between sam and bam: samtools view thing.sam > thing.bam samtools ...