Comments on: Array vs. Vector Part II

By: Miracle

Miracle — Fri, 13 Jan 2012 07:16:13 +0000

Your posting really straihgetend me out. Thanks!

By: jackson

jackson — Mon, 24 Oct 2011 15:43:19 +0000

That's definitely the faster way of going, but in this case the point of the test was to compare the performance of delete on Array and Vector in case you ever do want to do it. Hopefully the slow results convince you not to. :)

By: Joist

Joist — Mon, 24 Oct 2011 10:37:21 +0000

I'm curious to know why you use delete on the vectorObjects instead of nulling the reference.

//3852
delete vectorObject[j];

//150
vectorObject[j] = null;

also when the array is full of objects

//3904
delete array[j];

//100
array[j] = null;

By: jackson

jackson — Tue, 23 Mar 2010 17:16:13 +0000

You're right that delete is doing nothing to the Vector and setting the element to undefined in the Array. In the Array's case, it may also break the dense/hash portions up, but that's not the case here given the deletion at the end. Given that, it seems very odd that delete would take so long. Were you perhaps referring to the time taken by shift, pop, and splice instead?

By: Bolder then the Bold – The 9700 Rocks! | Iphone Bizarre

Bolder then the Bold – The 9700 Rocks! | Iphone Bizarre — Tue, 23 Mar 2010 15:32:47 +0000

[...] Array vs. Vector Part II « JacksonDunstan.com [...]

By: jpauclair

jpauclair — Tue, 23 Mar 2010 13:55:23 +0000

delete the element from a vector is doing nothing exept returning true, the reference stay the same.
For the array, it sets the element to undefined.

By: jpauclair

jpauclair — Tue, 23 Mar 2010 13:16:09 +0000

You delete multiple time the same element.
Also, is “delete” actualy removing the element? I guess not if you can loop on it again…

for (i = 0; i = 0; --j)
{
    delete vectorObject[j];
}

By: aaulia

aaulia — Tue, 23 Mar 2010 12:00:57 +0000

If your reference to the object is only the array/vector, then yes it will be GC-ed. But if you have reference to the object other than the one in the array/vector (another variable maybe) then the object will live on, until the reference is removed. The best solution for things like this is Object Polling, you don’t have to delete the object, instead you recycle it.

By: TwoFace

TwoFace — Tue, 23 Mar 2010 10:09:55 +0000

Hm, just wondering, what will be with object when you will not delete it from array/vector but replace it with NaN/null? Does the GC collect it or what?