javascript - Will console.log prevent garbage collection? - Stack Overflow

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If I have an object that would normally be garbage collected, but has been logged to the console, will it still be eligible for garbage collection?

(function(){
  var o = { foo: {} }; 
  console.log(o);
}())

// Can o be collected?

If yes, are there any circumstances where writing to the console (using any of its methods) can affect eligibility for garbage collection?

Edit: I dont believe it will affect eligibility for collection based on watching the heap in Chrome dev tools. But will any category of writing to the console do so?

If I have an object that would normally be garbage collected, but has been logged to the console, will it still be eligible for garbage collection?

(function(){
  var o = { foo: {} }; 
  console.log(o);
}())

// Can o be collected?

If yes, are there any circumstances where writing to the console (using any of its methods) can affect eligibility for garbage collection?

Edit: I dont believe it will affect eligibility for collection based on watching the heap in Chrome dev tools. But will any category of writing to the console do so?

• javascript

Share Follow edited Mar 3, 2015 at 19:07 Ben Aston asked Mar 3, 2015 at 18:50 Ben AstonBen Aston 55.8k6969 gold badges220220 silver badges349349 bronze badges 2

• 5 Chrome sometimes adds a note to logged objects, something like "evaluated upon first expansion". This suggests that the object might have been GCd in the meantime. But it could also just refer to modifications. – Thomas Commented Mar 3, 2015 at 18:52
• @Thomas I'm pretty sure it's referring to modifications. – Scimonster Commented Mar 3, 2015 at 18:56

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1 Answer 1

Sorted by: Reset to default 6

If you log an object to the console it can not be garbage collected.

You can verify this by entering in the chrome console:

var Foo = function() {};
console.log(new Foo());

Go to “Profiles” and “Take Heap Snapshot”. This will do a garbage collection automatically. Search for class “Foo”. There will be a 1 in column “Objects count“.

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