Tutorial by Examples: le

To avoid unsightly #DIV/0 errors in a spreadsheet, a custom function can be used. /** * Divides n by d unless d is zero, in which case, it returns * the given symbol. * * @param {n} number The numerator * @param {d} number The divisor * @param {symbol} string The symbol to display...

There are two kind of types in Python. Immutable types and mutable types. Immutables An object of an immutable type cannot be changed. Any attempt to modify the object will result in a copy being created. This category includes: integers, floats, complex, strings, bytes, tuples, ranges and frozen...

One of the major use case when a developer needs to take mutability into account is when passing arguments to a function. This is very important, because this will determine the ability for the function to modify objects that doesn't belong to its scope, or in other words if the function has side ef...

First, complete the installation and setup to connect your app to Firebase. Then from anywhere in your class, you can write: // Write a message to the database FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message"); myRe...

Gradle (All Versions) This method works for all versions of gradle Add the buildscript code at the beginning of your build.gradle file. buildscript { repositories { maven { url "https://plugins.gradle.org/m2/" } } dependencies { classpath "org.example...

Gradle (All Versions) When adding multiple third party plugins you do not need to separate them into different instances of the buildscript(All) or plugin(2.1+) code, new plug ins can be added alongside pre-existing plugins. buildscript { repositories { maven { url "https://plu...

Sample Data: CREATE TABLE table_name ( id, list ) AS SELECT 1, 'a,b,c,d' FROM DUAL UNION ALL -- Multiple items in the list SELECT 2, 'e' FROM DUAL UNION ALL -- Single item in the list SELECT 3, NULL FROM DUAL UNION ALL -- NULL list SELECT 4, 'f,,g' FROM DUAL; -- NULL item...

IObserver<T> and IObservable<T> interfaces can be used to implement observer pattern in .NET IObservable<T> interface represents the class that sends notifications IObserver<T> interface represents the class that receives them public class Stock { private string Sym...

Code function add_the_theme_page(){ add_menu_page('Theme page title', 'Theme menu label', 'manage_options', 'theme-options', 'page_content', 'dashicons-book-alt'); } add_action('admin_menu', 'add_the_theme_page'); function page_content(){ echo '<div class="wrap"><h2&...

First you have to create a file constants.php and it is a good practice to create this file inside app/config/ folder. You can also add constants.php file in compose.json file. Example File: app/config/constants.php Array based constants inside the file: return [ 'CONSTANT' => 'This...

Code <h1><?php echo get_option( 'blogname' ); ?></h1> Output Name of the blog in H1 style

/* * Component is an interface * which all elements (files, * folders, links ...) will implement */ class Component { public: virtual int getSize() const = 0; }; /* * File class represents a file * in file system. */ class File : public Component { public: virtual int...

For sections, instead of utilizing one big JSON file (like settings_schema.json, they instead keep their schema within the file of the section that is using it. To do this {% schema %} {% endschema %} tags are used and JSON is placed between them. From there, the format is similar to settings_schema...

One of the most useful things that came along with sections is blocks. Blocks are basically a blueprint for something that can be created an unlimited amount of times. One of the best examples is the slides of a slider. A block is a top level item in the schema, meaning it is alongside things like n...

/* * This design have some major issues * For each new shape added the unit testing * of the GraphicEditor should be redone * When a new type of shape is added the time * for adding it will be high since the developer * who add it should understand the logic * of the Gr...

/* * For each new shape added the unit testing * of the GraphicEditor should not be redone * No need to understand the sourcecode * from GraphicEditor. * Since the drawing code is moved to the * concrete shape classes, it's a reduced risk * to affect old functionallity when new * functionall...

In order to expose Thymeleaf templates we need to define controllers. Example: @Controller @RequestMapping("/") public class MessageController { @Autowired private MessageRepository messageRepository; @GetMapping public ModelAndView index() { It...

Work in progress

Let's say we want to eliminate duplicated subsequence element from a string (it can be more than one). For example: 2,14,14,14,19 and convert it into: 2,14,19 Using gsub, we can achieve it: gsub("(\\d+)(,\\1)+","\\1", "2,14,14,14,19") [1] "2,14,19" ...

In android, every developer uses Anonymous Class (Runnable) at least once in a project. Any Anonymous Class has a reference to its parent (activity). If we perform a long-running task, the parent activity will not be destroyed until the task is ended. Example uses handler and Anonymous Runnable cla...