Can Property-based noSuchMethod Be Implemented in JavaScript?

Implementing Property-based noSuchMethod in JavaScript

In JavaScript, the noSuchMethod feature enables the handling of undefined methods through a designated function. This functionality can be useful in various scenarios. However, extending this concept to properties raises the question of whether there exists a similar mechanism or a means to implement one in JavaScript.

The answer lies in the introduction of ECMAScript 6 Proxies.Proxies offer an advanced way to create custom behavior for fundamental operations such as property access, assignment, and others. This feature enables the replication of the non-standard noSuchMethod trap for properties.

To emulate this behavior, you can implement traps on property access as demonstrated in the following code snippet:

<code class="js">function enableNoSuchMethod(obj) {
  return new Proxy(obj, {
    get(target, p) {
      if (p in target) {
        return target[p];
      } else if (typeof target.__noSuchMethod__ == "function") {
        return function(...args) {
          return target.__noSuchMethod__.call(target, p, args);
        };
      }
    }
  });
}</code>

With ES6 Proxies, you can customize behavior for property access and define non-existent methods using the noSuchMethod trap. This greatly enhances the flexibility and customization options available for JavaScript developers.

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