fn.bind() is a bit slower than calling function () { fn() }, it's
true. But it's a difference between 5,000,000Hz and 10,000,000Hz. If
you're doing IO anywhere, an extra µs isn't going to affect
performance noticeably.
Write your program so that it's clear and readable. Then profile it.
Then make the silly micro-optimizations only where they matter.
On Tue, May 29, 2012 at 10:37 AM, Marco Rogers <[email protected]> wrote:
> I believe the current state of things is that the closure method of binding
> is optimized and very fast in v8. Function#bind is not. This is partly due
> to the fact that nobody uses it, so it may not be worth the time to
> optimize. But I agree with those that say do what works for you. Deal with
> performance when it becomes a problem. And don't try to second guess v8.
> It's probably smarter than you :)
>
> One thing you could do, that think is more for code clarity than
> performance, is pre-bind any important objects.
>
> Object.keys(console).forEach(function(key) {
> if(typeof console[key] === 'function') {
> console[key] = console[key].bind(console);
> }
> });
>
> Now you can just pass console.log anywhere and it will always be properly
> bound. Keep in mind that this hampers your ability to do call/apply, so use
> it sparingly. It also doesn't actually help your setTimeout example because
> you need to pass a value, YMMV :)
>
> :Marco
>
>
> On Monday, May 28, 2012 5:52:46 PM UTC-7, phidelta wrote:
>>
>> Hi all,
>>
>> I have recently come to use .bind a lot, because it makes for very
>> clean code.
>>
>> So rather than doing
>>
>> <code>
>> var x; // this has some value that comes from prior code
>> setTimeout(function() { console.log(x) }, 5000);
>> </code>
>>
>> I am now often doing
>>
>> <code>
>> var x;
>> setTimeout(console.log.bind(console, x), 5000);
>> </code>
>>
>> The question I have is: what is more performant? Is there any reason
>> to avoid .bind()?
>>
>> Regards, Phil
>
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