Factory & Constructor Functions

What's the benefit of this lazy initialization approach in a factory?

const createDataProcessor = (() => {
  let heavyResource;
  
  const initializeResource = () => {
    // Expensive initialization
    return { /* complex data structure */ };
  };
  
  return () => {
    if (!heavyResource) {
      heavyResource = initializeResource();
    }
    return {
      process(data) {
        return heavyResource.process(data);
      }
    };
  };
})();

It makes processing faster
It uses less memory overall
It defers expensive initialization until needed
This lazy initialization pattern in a factory function defers expensive resource initialization until it's actually needed. The heavyResource is only created on first use, not when the factory is defined. This improves application startup time and saves resources if the processor is never used. It combines the benefits of factory functions (creating new processor instances) with efficient resource sharing (reusing the expensive resource across instances).
It prevents memory leaks

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