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javascript

Advanced JavaScript Tutorial for Experienced Developers

  • set: Intercepts property assignment.
  const handler = {
      set(target, prop, value) {
          if (typeof value === 'number') {
              target[prop] = value;
              return true;
          } else {
              console.error(`Property '${prop}' must be a number.`);
              return false;
          }
      }
  };

  const proxy = new Proxy({}, handler);
  proxy.age = 30; // Works fine
  proxy.age = 'thirty'; // Output: Property 'age' must be a number.

Sep 02, 2024
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