JavaScript - Automatic memory management following the execution of functions

After doing some research on garbage collection in JavaScript, I came across information stating that local variables of functions are collected once the function has returned (except for cyclical references which require breaking circles for the GC to function).

My question is, what exactly does "function returned" mean in this context?

Does it refer to:

  1. The function must return values.

    or simply:

  2. The function call has concluded.

In my opinion, 2) seems more logical, but if I am mistaken:

  • How does this apply to functions that do not return any values?
  • Should I include an empty return; statement in functions that do not return anything to ensure the garbage collector is triggered?

Answer №1

When a function does not have a return statement, it will implicitly return undefined. This means that when a function "ends," it is essentially "returning" at the same time.

It's important to note that local variables are not immediately collected by garbage collection after a function returns. Instead, they simply become eligible for garbage collection at that moment. The garbage collector in a browser runs whenever it deems necessary or believes it can run without significantly affecting performance (although this behavior may vary depending on the specific implementation).

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