Hi Stefan,
I'm asking to deeper understand V8.
What's going on in the original code (see first message) which leads to
single-function-per-many objects?
> The following drops the need for the closure, and lets v8 optimize nicely.
> Unfortunately you lose the hidden aspect of the internal state.
>
> function Machine(power) {
> this.enabled = true;
> }
>
> Machine.prototype.enable = function() {
> this.enabled = true;
> };
>
> Machine.prototype.disable() {
> this.enabled = false
> };
>
>
> On Tue, Jun 10, 2014 at 4:31 PM, Ilya Kantor <[email protected]
> <javascript:>> wrote:
>
>> Hi Ben,
>>
>> Is that somehow related with "Hidden classes" for objects or that's a
>> completely another optimization technique?
>>
>> среда, 11 июня 2014 г., 0:29:07 UTC+4 пользователь Ben Noordhuis написал:
>>
>>> On Tue, Jun 10, 2014 at 9:58 PM, Ilya Kantor <[email protected]> wrote:
>>> > Hi,
>>> >
>>> > When I create many objects new Machine like this
>>> > ```
>>> > function Machine(power) {
>>> > var enabled = false;
>>> >
>>> > this.enable = function() {
>>> > enabled = true;
>>> > };
>>> > this.disable = function() {
>>> > enabled = false;
>>> > };
>>> > }
>>> >
>>> > var machines = []
>>> > for(var i=0; i<10000; i++) machines.push(new Machine)
>>> > ```
>>> >
>>> > ...I see in Chrome Heap Profile that every object has 36 bytes for
>>> function
>>> > enable/disable.
>>> > That is so even if the function code is actually longer.
>>> >
>>> > Do I get it right that V8 actually creates these functions only ONE
>>> time and
>>> > uses it for all machines?
>>>
>>> That's correct, there is only one function. Those 36 byte instances
>>> that you're seeing are closure environments for the captured variable.
>>>
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>
>
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