Deterministic Resource Management with Explicit Disposal

Snippet

Deterministic Resource Management with Explicit Disposal

The Explicit Resource Management API introduces the 'using' keyword to manage the lifecycle of objects that implement Symbol.dispose. This ensures resources like file handles or database connections are closed immediately when leaving the scope, preventing memory leaks and resource exhaustion without relying solely on the Garbage Collector.

snippet.js

javascript

class DatabaseConnection {
  #client;
  constructor() { this.#client = 'connected'; }
  [Symbol.dispose]() {
    this.#client = null;
    console.log('Resource released automatically');
  }
}
 
{
  using db = new DatabaseConnection();
  // Work with db... 
} // Resource is disposed here even if an error is thrown

nodejs

Breakdown

using db = new DatabaseConnection();

Declares a resource bound to the current block scope.

[Symbol.dispose]() { ... }

The protocol method called automatically when the scope ends.

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Deterministic Resource Management with Explicit Disposal

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