> On 13 Mar 2015, at 08:41, stepharo <steph...@free.fr> wrote:
>
> use
>
> String streamContents: [:s |
> s nextPutAll: 'jlklkjkl' ]
>
>
> or
>
> String streamContents: [:s |
> s << 'jlklkjkl' ]
>
>
> it is a great method for manipulating
>
> Le 10/3/15 19:09, sergio_101 a écrit :
>>
>> it seems that in more cases than not, i find that developers use a stream
>> when concatenating some text strings.
>>
>> I am wondering if this is a smalltalk thing, or is there a real speed
>> benefit when using streams in this way.
>>
When adding to a string, you create a new one with the right size and copy over
the old content.
Using a stream avoids that. But there is a cost for handling the stream, too:
[String streamContents: [:s |
s nextPutAll: 'jlklkjkl';
nextPutAll: 'jlklkjkl' ]] bench. "'1,866,774 per second'"
['jlklkjkl' , 'jlklkjkl'] bench "'5,433,931 per second’"
So it is only faster e.g. when adding to a string in a loop or on larger
strings.
But it reads quite nice, too, so I tend to use it without thinking about
performance.
Marcus
