Suppose you have a collection elements, and you want to create another collection containing the same elements but with all duplicates eliminated:
Collection<Type> noDuplicates = new HashSet<Type>(elements);
Example:
List<String> names = new ArrayList<>(
Arrays....
// First load a product object
$product->getSku();
$product->getName();
// Alternative method
$product->getData('sku');
$product->getData('name');
// First load a collection object
foreach($collection as $product) {
$product->getSku();
$product->getName();
// Alternative method
$product->getData('sku');
$product->getData('name');
}
Suppose you have multiple threads running. Each thread is doing one task. You want to get notified either on the mainThread OR another thread, when all the task-threads are completed.
The simplest solution to such a problem is a DispatchGroup.
When using a DispatchGroup, for each request, you ente...
Xposed is a framework that allows you to hook method calls of other apps. When you do a modification by decompiling an APK, you can insert/change commands directly wherever you want. However, you will need to recompile/sign the APK afterwards and you can only distribute the whole package. With Xpose...
The example in Visitor Pattern provides a compelling use-case for CRTP:
struct IShape
{
virtual ~IShape() = default;
virtual void accept(IShapeVisitor&) const = 0;
};
struct Circle : IShape
{
// ...
// Each shape has to implement this method the same way
...
The UMD (Universal Module Definition) pattern is used when our module needs to be imported by a number of different module loaders (e.g. AMD, CommonJS).
The pattern itself consists of two parts:
An IIFE (Immediately-Invoked Function Expression) that checks for the module loader that is being i...
AMD is a module definition system that attempts to address some of the common issues with other systems like CommonJS and anonymous closures.
AMD addresses these issues by:
Registering the factory function by calling define(), instead of immediately executing it
Passing dependencies as an array...
Laravel's events allows to implement the Observer pattern. This can be used to send a welcome email to a user whenever they register on your application.
New events and listeners can be generated using the artisan command line utility after registering the event and their particular listener in App...
The Scala Collections framework, according to its authors, is designed to be easy to use, concise, safe, fast, and universal.
The framework is made up of Scala traits that are designed to be building blocks for creating collections. For more information on these building blocks, read the official S...
Having more than one element with the same ID is a hard to troubleshoot problem. The HTML parser will usually try to render the page in any case. Usually no error occurs. But the pace could end up in a mis-behaving web page.
In this example:
<div id="aDiv">a</div>
<div id...
The Data.Vector module provided by the vector is a high performance library for working with arrays.
Once you've imported Data.Vector, it's easy to start using a Vector:
Prelude> import Data.Vector
Prelude Data.Vector> let a = fromList [2,3,4]
Prelude Data.Vector> a
fromList [2,3,4]...
Vectors can be map'd and fold'd,filter'd andzip`'d:
Prelude Data.Vector> Data.Vector.map (^2) y
fromList [0,1,4,9,16,25,36,49,64,81,100,121] :: Data.Vector.Vector
Reduce to a single value:
Prelude Data.Vector> Data.Vector.foldl (+) 0 y
66
Mixins are similar to defining and calling functions. Say, if we need to create a repetitive style, mixins are handy. Mixins may or may not take parameters. For e.g.:
.default-round-borders {
border-radius: 5px;
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
}
.round-b...
In Less, unlike Sass or Shell, the variables are declared by having names starting with a @ symbol. For example:
@sky-blue: #87ceeb;
body {
background-color: @sky-blue;
}
The above example gives you:
body {
background-color: #87ceeb;
}
Here it explains how to declare a variable an...
6
In ECMAScript 6, when using the module syntax (import/export), each file becomes its own module with a private namespace. Top-level functions and variables do not pollute the global namespace. To expose functions, classes, and variables for other modules to import, you can use the export keyword....
By default, npm installs the latest available version of modules according to each dependencies' semantic version. This can be problematic if a module author doesn't adhere to semver and introduces breaking changes in a module update, for example.
To lock down each dependencies' version (and the ve...
In order to start using Sequelize, you must first install the Sequelize package using the Node Package Manager (npm).
Install sequelize module
Add --save option to store module in package.json
npm install sequelize
Next, depending on which database system you wish to use with Sequelize, instal...
To make a module eligible for Hot Module Replacement (HMR), the simplest way is to add module.hot.accept() inside the module, like this:
// ...
if(module.hot) {
module.hot.accept(); // This will make current module replaceable
}
