On 13 Mar 2015, at 08:41, stepharo <stepharo@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 secondâ" 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