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Foolish Flamingo answered on December 21, 2021 Popularity 10/10 Helpfulness 2/10

answer singleton

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let instance;
let counter = 0;

class Counter {
  constructor() {
    if (instance) {
      throw new Error("You can only create one instance!");
    }
    instance = this;
  }
}

const singletonCounter = Object.freeze(new Counter());
export default singletonCounter;

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.patterns.dev

Tags: javascript singleton

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Contributed on Dec 21 2021

Foolish Flamingo

0 Answers Avg Quality 2/10

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what is singleton

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A singleton is a design pattern in software engineering that restricts 
a class to have only one instance of the object and provides a single 
point of access to it for any part of the code. The purpose of the 
singleton pattern is to ensure that a class has only one instance 
and to provide a global point of access to this instance.

In other words, it is a class that is designed to have only one instance
and to ensure that this instance is easily accessible to the rest of the system.
Singleton classes are often used for things like database connections, 
logging, thread pools, or caches, where having multiple instances could 
lead to unexpected behavior or errors.

Popularity 10/10 Helpfulness 4/10 Language whatever

Source: Grepper

Tags: singleton sing

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Contributed on Feb 09 2023

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singleton

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public final class Singleton {

  private static final Singleton INSTANCE = new Singleton();

  private Singleton() {}

  public static Singleton getInstance() { 
    return INSTANCE;
  }
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: ar.wikipedia.org

Tags: java

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Contributed on May 04 2022

Adorable Anteater

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Singleton

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class SingletonExample
{
    private static $instance;

    // Prevent instantiation of the class through the constructor
    private function __construct()
    {
        // Initialize object properties here, if needed
    }

    // Static method to get the unique instance
    public static function getInstance()
    {
        if (!self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    // Add specific methods of your singleton here
    public function someMethod()
    {
        // Your code here
    }
}


$singleton1 = SingletonExample::getInstance();
$singleton2 = SingletonExample::getInstance();

// Both $singleton1 and $singleton2 refer to the same instance
// You will have only one instance of SingletonExample throughout the system.

Popularity 10/10 Helpfulness 2/10 Language php

Source: chat.openai.com

Tags: php

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Contributed on Jul 26 2023

PrototypeCodec

0 Answers Avg Quality 2/10

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