Tutorial by Examples: p

An immutable object is an object whose state cannot be changed. An immutable class is a class whose instances are immutable by design, and implementation. The Java class which is most commonly presented as an example of immutability is java.lang.String. The following is a stereotypical example: ...

You can let I18n handle pluralization for you, just use count argument. You need to set up your locale file like this: # config/locales/en.yml en: online_users: one: "1 user is online" other: "%{count} users are online" And then use the key you just created by ...

Array type with known and possibly different types: let day: [number, string]; day = [0, 'Monday']; // valid day = ['zero', 'Monday']; // invalid: 'zero' is not numeric console.log(day[0]); // 0 console.log(day[1]); // Monday day[2] = 'Saturday'; // valid: [0, 'Saturday'] day[3] = fals...

Add one common horizontal line for all categorical variables # sample data df <- data.frame(x=('A', 'B'), y = c(3, 4)) p1 <- ggplot(df, aes(x=x, y=y)) + geom_bar(position = "dodge", stat = 'identity') + theme_bw() p1 + geom_hline(aes(yintercept=5), colour=...

Position configuration for the credits label. Supported properties are align, verticalAlign, x and y. Defaults to: credits: { position: { align: 'right', x: -10, verticalAlign: 'bottom', y: -5 } },

PHP makes it easy to get data from your results and loop over it using a while statement. When it fails to get the next row, it returns false, and your loop ends. These examples work with mysqli_fetch_assoc - Associative array with column names as keys mysqli_fetch_object - stdClass object with ...

Occasionally you may want to use the same tuple type in multiple places throughout your code. This can quickly get messy, especially if your tuple is complex: // Define a circle tuple by its center point and radius let unitCircle: (center: (x: CGFloat, y: CGFloat), radius: CGFloat) = ((0.0, 0.0), ...

The DATEDIF function returns the difference between two date values, based on the interval specified. It is provided for compatibility with Lotus 1-2-3. The DATEDIF function cannot be found on the function list and autocomplete and screen tips are unavailable. Note: It is pronounced "date diff&...

Some example cases when the result is an optional. var result: AnyObject? = someMethod() switch result { case nil: print("result is nothing") case is String: print("result is a String") case _ as Double: print("result is not nil, any value that is a Dou...

If you want to mimic HTML form POST action, you can use cURL. // POST data in array $post = [ 'a' => 'apple', 'b' => 'banana' ]; // Create a new cURL resource with URL to POST $ch = curl_init('http://www.example.com'); // We set parameter CURLOPT_RETURNTRANSFER to read outp...

Before C++17, having pointers with a value of nullptr commonly represented the absence of a value. This is a good solution for large objects that have been dynamically allocated and are already managed by pointers. However, this solution does not work well for small or primitive types such as int, w...

Before C++17, a function typically represented failure in one of several ways: A null pointer was returned. e.g. Calling a function Delegate *App::get_delegate() on an App instance that did not have a delegate would return nullptr. This is a good solution for objects that have been dynamicall...

Usually data sent in a POST request is structured key/value pairs with a MIME type of application/x-www-form-urlencoded. However many applications such as web services require raw data, often in XML or JSON format, to be sent instead. This data can be read using one of two methods. php://input is a...

Some C implementations permit code to write to one member of a union type then read from another in order to perform a sort of reinterpreting cast (parsing the new type as the bit representation of the old one). It is important to note however, this is not permitted by the C standard current or pas...

You can declare multiple constants within the same const block: const ( Alpha = "alpha" Beta = "beta" Gamma = "gamma" ) And automatically increment constants with the iota keyword: const ( Zero = iota // Zero == 0 One // One == 1...

The apply and call methods in every function allow it to provide a custom value for this. function print() { console.log(this.toPrint); } print.apply({ toPrint: "Foo" }); // >> "Foo" print.call({ toPrint: "Foo" }); // >> "Foo" You mig...

To create a custom template we first need to create php file in a theme directory. You can name it almost any way you want. For this example we will create example.php One and only thing we need to define inside our example.php, to be recognized by WordPress as a template, is template name. We do t...

Let's extend our template from above and include content from header.php and footer.php Including header: We will include header right after Template name comment There are two common ways to do this. Both are right and work same, it's just about your style and how code looks First way: <?ph...

We will further extend our template and include title of the page and a content <?php /* Template Name: Example */ get_header(); the_title(); the_content(); get_footer(); And if you want you can wrap them with HTML elements like this <?php /* Template Name: Example *...

If we have a struct like this struct Box { let name: String let thingsInside: Int } and an array of Box(es) let boxes = [ Box(name: "Box 0", thingsInside: 1), Box(name: "Box 1", thingsInside: 2), Box(name: "Box 2", thingsInside: 3), B...