Verifying that objects are eligible for garbage collection

My program in node.js receives a high volume of messages. Each time a message is received, I create a new object and pass the message content to it. Inside the constructor of the new object, various operations are performed, including some mongo tasks with callbacks.

Once the operations within the object constructor are finished, the object becomes unnecessary.

After trying different methods such as storing the object in an array or deleting it as a property of another object, I decided to go with a simpler approach.

var x = new DisposableObject(message);
delete x;

This approach seems to work well. There can be multiple instances of DisposableObject existing simultaneously. The objects are created and function as expected during tests. I believe that deleting 'x' only removes the reference to the object, not the object itself. The object's callbacks are executed successfully.

I have four questions:

  1. Will this simple approach allow the garbage collector (node/V8) to eliminate the object?
  2. Could there be any potential issues or risks in my code due to this method?
  3. Is it problematic if multiple instances of DisposableObject remain active, waiting for callbacks when there are no references left to them in my program?
  4. Is there a more efficient way to create objects and ensure they can be garbage collected after completing their tasks?

Answer №1

When it comes to Javascript, it utilizes a nongenerational mark-and-sweep garbage collector which automatically takes care of collecting objects that are no longer needed. This means that there is no need for concern regarding garbage collection.

However, there are some important points to keep in mind (as mentioned in this answer):

  1. Avoid using the delete keyword on objects as it does not actually delete an object itself, but rather its properties. To ensure proper deletion of objects created using the new statement, pair it with a delete statement. This ensures that all associated memory, including property names, will be available for garbage collection. For more information on the delete statement, refer to “Freeing Objects.”

  2. Always use the var keyword when declaring variables. Variables created without it will be at the global scope and never subject to garbage collection, potentially leading to memory leaks.

  3. Global variables are persistent and will always exist unless explicitly set to null. When set to null, the memory referenced by the variable becomes eligible for collection. However, the variable itself still exists simply pointing to null. Further details can be found here.

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