We can see the performance difference from the simple functions in Tango and Phobos

[Walter Bright]

zsxxsz wrote:
> Hi, below are the functions from Phobos and Tango with the same use, we can
> see why so many people like Tango more than Phobos.
> 
>>>> In Phobos:
> 
> string encode(string s)
> {
>     // The ifs are (temprarily, we hope) necessary, because
>     // std.string.write.replace
>     // does not do copy-on-write, but instead copies always.
> 
>     if (s.indexOf('&') != -1) s = replace(s,"&","&");
>     if (s.indexOf('"') != -1) s = replace(s,"\"",""");
>     if (s.indexOf("'") != -1) s = replace(s,"'","'");
>     if (s.indexOf('<') != -1) s = replace(s,"<","&lt;");
>     if (s.indexOf('>') != -1) s = replace(s,">","&gt;");
>     return s;
> }

That's from std.xml. I won't make any excuse for it, it's very inefficient.